Document:

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                                                                   EXHIBIT 10.22

                          Joint Development Agreement

                                     Between

                    Dow Corning Corporation & Tessera, Inc.

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       This Joint Development Agreement ("Agreement") is made and entered into
by and between Tessera, Inc., a corporation organized under the laws of
Delaware, having a principal place of business at 3099 Orchard Drive, San Jose
CA 95134 (hereinafter "Tessera") and Dow Corning Corporation, a corporation
organized under the laws of Michigan having a principal place of business at
2200 West Salzburg Road, Midland, MI 48686 and its wholly owned subsidiaries (as
set forth in Appendix D) and its Affiliates (hereinafter "DCC"), on May 12, 1997
("Effective Date") with reference to the following facts:

       WHEREAS, Tessera is in the business of developing and selling certain
components useful in the fabrication of packages for microelectronic devices and
has developed and is continuing to develop a network of Tessera Licensees for
the production of such packages. In the development of such microelectronic
packages, Tessera has also formulated certain materials for the improvement of
such packages; and

       WHEREAS, DCC is in the business of developing and selling silicone
materials and associated technology. DCC desires to manufacture materials for
sale and transfer to Tessera and Tessera Licensees;

       NOW THEREFORE, the parties hereto agree as follows:

1.0    DEFINITIONS

1.1    "Technology" means know-how relating to design, formulation and use of
       silicone materials for the manufacture of microelectronic components,
       non-exclusively including Confidential Information, material
       specifications, chemical structure, current best method of manufacture
       and assembly, component specifications, design methods, process data,
       yields, reliability data, and other engineering data and test results.

1.2    "Improvement" means modifications, derivatives, improvements, improved
       formulation or enhanced specifications relating to the Specification
       Materials and arising out of Technology that may be made by either party
       hereto under the provisions and during the term of this Agreement or
       extension hereof. Notwithstanding, Licensee Improvements shall be
       excluded from the definition of Improvements.

1.3    "Licensee Improvement" means a modification to a Specification Material
       as requested by a Tessera Licensee that: (1) modifies such Specification
       Material in other than an aesthetic manner; and (2) was not earlier
       requested, in writing, by Tessera.

1.4    "Joint Invention" means a patentable invention invented by two (2) or
       more inventors prior to the expiration or termination of this Agreement,
       at the time of such invention at least one of such inventors being an
       employee of Tessera and at least one such inventors being an employee of
       DCC. For the purposes of this paragraph, the term "employee" shall mean
       those people who have an obligation to assign rights in patentable
       inventions to a respective party to this Agreement, including contract
       employees.

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TESSERA/DOW CORNING CONFIDENTIAL

1.5    "Confidential Information" includes all information disclosed prior to
       the expiration or termination of this Agreement by one party to another
       hereunder including, without limitation, ideas, inventions (whether
       patentable or not), designs, product concepts, improvements,
       manufacturing tolerances, quality standards, business strategies,
       forecasts, customer lists, product development plans and marketing plans
       provided, however, that such information is designated and marked as
       being confidential in nature by the disclosing party at the time of
       disclosure to the receiving party and provided further that such
       information, if disclosed orally, is reduced to writing, marked as being
       confidential, and delivered to the receiving party within thirty (30)
       days after such disclosure. Notwithstanding, Confidential Information
       shall not include any information which: (1) was lawfully in possession
       prior to receipt from disclosing party; (2) is or becomes a matter of
       public knowledge through no fault of the receiving party; (3) is lawfully
       obtained by the receiving party from a third party under no obligation of
       confidentiality; (4) is independently invented by the receiving party
       without reference to the disclosed Confidential Information; or (5) the
       receiving party receives prior written consent for disclosure of
       Confidential Information to a third party.

1.6    "Trade Secret" means Technology or information that is disclosed to the
       other party prior to the expiration or termination of this Agreement and
       that: (i) derives independent economic value, actual or potential, from
       not being generally known to, and not being readily ascertainable by
       proper means by persons who can obtain economic value from its disclosure
       or use; (ii) is the subject of efforts that are reasonable under the
       circumstances to maintain its secrecy; and (iii) is disclosed to the
       other party and designated, in written form, as a trade secret. The
       parties acknowledge that they have been working together since September
       1996 on Specification Materials and that certain Specification Materials
       that have been developed to date may have used the Trade Secret
       information of at least one of the parties. Tessera and DCC agree that
       Trade Secrets transferred prior to the Effective Date shall fall within
       the terms of this Agreement provided the respective parties identify such
       information to the other party within ninety (90) days of the Effective
       Date of this Agreement.

1.7    "Sample" means a sufficient quantity (as mutually agreed upon by the
       parties hereto) of a Specification Material from DCC to test and evaluate
       the material performance.

1.8    "Commercialization Date" means either the date of the first sale to
       Tessera or a Tessera Licensee or one (1) year from the date of the first
       shipment of a Sample to Tessera or a Licensee, which ever is earlier.

1.8A   "TCC(R) Package" means a microelectronic device reading on or equivalent
       to one or more claims in a patent or patent application listed in
       Appendix F, as amended from time to time by written mutual agreement
       signed by both parties hereto.

1.9    "Specification Material" means a silicone material developed pursuant to
       this Agreement, for use by Tessera in a Tessera microelectronic package,
       which is manufactured by DCC to Tessera specifications or Tessera and DCC
       joint specifications and (i) sampled to Tessera within the term of this
       Agreement and qualified by Tessera for use in a Tessera TCC(R) Package
       within four (4) months of such sampling; or (ii) sampled to Tessera
       within the term of this Agreement and substantially similar to a material
       qualified by Tessera for use in a Tessera TCC(R) Package.

1.9A   "General Specification Materials" means a silicone material which is (i)
       a Specification other than a Low Solvent Swell Material; or (ii) a
       product listed in Appendix E and substantially

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TESSERA/DOW CORNING CONFIDENTIAL

       similar products to such products listed in Appendix E which have been
       sampled to Tessera between September 1996 and the Effective Date of this
       Agreement.

1.10   "Low Solvent Swell Material" means a Specification Material which either
       (1) reads on or is equivalent to one or more of the claims in the patents
       resulting from the patent applications listed in Appendix C; or (2) is
       based upon Tessera's Trade Secret information related to Tessera's filler
       or filler treatment Technology.

1.11   "Tessera Licensee" means those parties Tessera has licensed to its
       patents for the manufacture of certain microelectronic packages and
       components therefor, namely TCC packages and TCMT materials, as listed in
       Appendix A and amended from time to time by Tessera in a written
       notification to DCC. Tessera agrees not to delete a Tessera Licensee from
       the list in Attachment A unless either: (1) the party in question has
       been found, by a court of competent jurisdiction, to be in violation of a
       license agreement between Tessera and such party; or (2) such party has
       not disputed a termination of their license by Tessera within thirty (30)
       days of such termination.

1.12   "Semiconductor Grade Material" means silicone material used in the
       packaging of microelectronic devices.

1.13   "Affiliate" means any company (1) of which more than fifty percent (50%)
       of the voting stock is owned or controlled by Dow Corning Corporation
       (the entity executing this agreement); and (2) agrees to be bound by the
       terms of this Agreement in a written memorandum signed by such company
       and by Tessera. A company shall be considered an Affiliate only so long
       as such majority ownership or control exists.

1.14   "Tessera Trademarks" includes, for the purposes of this Agreement, the
       following Tessera marks as further set forth in Appendix B: TESSERA,
       COMPLIANT CHIP, TCC, TCMT, (mu)BGA, Micro BGA and the TESSERA BLOCK
       LOGO as shown below:

       [LOGO]

2.0    SCOPE OF AGREEMENT

2.1    Low Solvent Swell Material Development. Tessera and DCC shall use
       reasonable efforts to use their respective Technology to develop Low
       Solvent Swell Materials for use by Tessera in Tessera TCC(R) Packages.
       Tessera shall use reasonable efforts to provide DCC with sufficient
       Tessera Technology to enable DCC to manufacture Samples of Low Solvent
       Swell Materials. Tessera shall notify DCC if Tessera uses reasonable
       efforts to provide a DCC competitor with sufficient Tessera Technology to
       enable such DCC competitor to manufacture Low Solvent Swell Materials.
       DCC shall use reasonable efforts to furnish Tessera with such Samples for
       test and evaluation within Tessera TCC(R) Packages. DCC shall also use
       reasonable efforts to provide Tessera with sufficient DCC Technology to
       aid in the test and evaluation of the material performance, as set forth
       in Paragraph 2.8. Further, DCC shall use reasonable efforts to modify any
       Low Solvent Swell Material or to supplement any material characteristic
       data when reasonably requested by Tessera.

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       It is understood and agreed that DCC may modify DCC commercial products
       for use by Tessera in a Tessera TCC(R) Package. If such modified products
       fall within the scope of Low Solvent Swell Materials, such modified
       products will be relabeled and such relabeled products will be subject to
       the restrictions of Paragraph 2.51. The original DCC commercial products
       and any modifications thereto (other than modifications made pursuant to
       the immediately preceding paragraph) are excluded from the definition of
       Low Solvent Swell Materials.

       It is understood and agreed that DCC may utilize current or future DCC
       technology or know-how to develop ingredients for silicone materials for
       use by Tessera. If such silicone materials fall within the scope of Low
       Solvent Swell Materials, such silicone materials will be subject to the
       restrictions of Paragraph 2.51. Such ingredients and silicone materials
       developed using DCC technology or know-how, other than silicone materials
       developed by DCC for use by Tessera in a Tessera TCC(R) Package, are
       excluded from the definition of Low Solvent Swell Materials.

2.2    General Specification Material Development. Tessera and DCC shall use
       reasonable efforts to use their respective Technology to develop General
       Specification Materials for use by Tessera in microelectronic packaging.
       Tessera shall use reasonable efforts to provide DCC with sufficient
       Tessera Technology to enable DCC to manufacture Samples of such General
       Specification Materials. DCC shall use reasonable efforts to furnish
       Tessera with such Samples for test and evaluation within Tessera's
       microelectronic packages. DCC shall use reasonable efforts to provide
       Tessera with sufficient DCC Technology to aid in the test and evaluation
       of the material performance, as set forth in Paragraph 2.8. Further, DCC
       shall use reasonable efforts to modify any General Specification Material
       or to supplement any material characteristic data when reasonably
       requested by Tessera.

       It is understood and agreed that DCC may modify DCC commercial products
       for use by Tessera in a Tessera TCC(R) Package. If such modified products
       fall within the scope of General Specification Materials, such modified
       products will be relabeled and such relabeled products will be subject to
       the restrictions of Paragraph 2.52. The original DCC commercial products
       and any modifications thereto (other than modifications made pursuant
       to the immediately preceding paragraph) are excluded from the definition
       of General Specification Materials.

       It is understood and agreed that DCC may utilize current or future DCC
       technology or know-how to develop ingredients for silicone materials for
       use by Tessera. If such silicone materials fall within the scope of
       General Specification Materials, such silicone materials will be subject
       to the restrictions of Paragraph 2.52. Such ingredients and silicone
       materials developed using DCC technology or know-how, other than silicone
       materials developed by DCC for use by Tessera in a Tessera TCC(R)
       Package, are excluded from the definition of General Specification
       Materials.

2.3    Samples to Tessera Licensees. DCC shall not provide Specification
       Materials or related information to Tessera Licensees unless a written,
       mutual agreement has been signed by both Tessera and DCC allowing DCC to
       sample or sell a particular Specification Material to a Tessera Licensee,
       provided that prior to any disclosure of Confidential Information DCC and
       the particular Tessera Licensee shall execute a non-disclosure agreement
       having no less protective terms for Confidential Information than the
       terms set forth in this Agreement.

2.4    Tessera Licensee Modifications. In the event that DCC makes a
       modification to a Specification Material as a result of a request from
       a Tessera Licensee and such modification falls under the

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       definition of a Licensee Improvement, DCC shall use reasonable efforts to
       obtain permission to send such improved Specification Material to Tessera
       for evaluation.

2.5    Lead-time

       2.51   Low Solvent Swell Material.

              (A)    Except as provided in Paragraph 2.11 or Paragraph 2.51(B),
                     for a period of [*] ([*]) [*] from the Effective Date of
                     this Agreement, DCC will not ship a Low Solvent Swell
                     Material to any party other than Tessera or a Tessera
                     Licensee.

                     (B)    For a period of [*] ([*]) [*] from the first sale
                     (within the borders of any country that is a member of the
                     European Economic Area) of each type of Low Solvent Swell
                     Material (i.e. (i) encapsulants; (ii) compliant interposer
                     pad material; and (iii) die attach/adhesives), DCC will not
                     ship any such particular type of Low Solvent Swell Material
                     to any other party, other than Tessera or a Tessera
                     Licensee, who is doing microelectronic packaging or related
                     business within the borders of any country that is a member
                     of the European Economic Area. After each such: [*] ([*])
                     [*] period from such first sale of a particular type of Low
                     Solvent Swell Material, DCC may ship such particular Low
                     Solvent Swell Materials to any party doing business within
                     the borders of any country that is a member of the European
                     Economic Area.

       2.52   General Specification Material. Except with Tessera's permission,
              DCC will not supply General Specification Material to any other
              party other than Tessera or a Tessera Licensee for a period of
              [*] ([*]) [*] from the Commercialization Date of each Sample.

2.6    Exclusive Promotion. For a period of [*] ([*]) [*] from the Effective
       Date of this Agreement, Tessera will exclusively promote the
       Specification Materials in publications, licensee training and device
       qualifications so long as competitive materials are not substantially
       better for the particular packaging application, e.g. encapsulants,
       compliant interposer pads, die attach/adhesives, etc.

2.7    Confidential. Except as otherwise limited by paragraphs 1.5 and 5.1, all
       physical Samples of Specification Materials shall be treated as
       Confidential Information by Tessera and DCC until both Tessera and DCC
       agree to make such Samples non-confidential.

2.8    Test and Evaluation of Specification Materials. Tessera shall have full
       discretion as to the nature and extent of the testing, evaluation and
       performance of Specification Materials. However, DCC shall be apprised of
       and shall have an opportunity to comment on the tests being performed to
       establish the performance of the materials within Tessera microelectronic
       packages.

2.9    DCC Rights Outside of Semiconductor Grade Material Applications: Outside
       the area of microelectronic packaging applications, DCC may manufacture,
       use and sell Specification Materials without Tessera's permission so long
       as DCC does not knowingly subvert the general intent of this Agreement by
       such manufacture, use or sale. The terms in Paragraph 2.7 do not apply to
       the sampling of Specification Materials outside the area of
       microelectronic packaging applications, as set forth in this Paragraph
       2.9.

2.10   Pricing. DCC shall use reasonable efforts to fulfill purchase orders for
       Specification Materials from Tessera, the pricing to Tessera for such
       Specification Materials shall be no greater than the

* Certain information on this page has been omitted and filed
  separately with the Commission. Confidential treatment has
  been requested with respect to the omitted portions.

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       lowest price in effect at the time of delivery of such Specification
       Material of any Tessera Licensee for the same Specification Material
       container size. Tessera's purchases shall be subject to DCC's normal
       availability and allocation procedures. This Pricing paragraph shall
       remain effective and binding on DCC for: (1) General Specification
       Materials: [*] ([*]) [*] from the Effective Date; (2) Low Solvent Swell
       Materials: [*] ([*]) [*] from the Effective Date.

2.11   Marketing in Japan. Once a written mutual agreement has been signed by
       both parties pursuant to Paragraph 2.3, DCC may utilize Dow Corning Toray
       Silicone Company Ltd. (hereinafter "DCTS") to sample or sell such
       Specification Materials to Tessera Licensees within Japan so long as DCC
       does not knowingly subvert the general intent of this Agreement by such
       utilization of DCTS.

3.0    INTELLECTUAL PROPERTY

3.1    Trademarks.

       3.11   License to Tessera Trademarks. Subject to the terms and conditions
              set forth within this Agreement and DCC's agreement to the
              provisions hereof including all attachments hereto, Tessera hereby
              grants DCC a non-exclusive, non-transferable, non-sublicensable,
              non-royalty bearing license to use the Tessera Trademarks on
              printed materials for the marketing and promotion of Specification
              Materials to Tessera Licensees. This license of the Tessera
              Trademarks shall continue for the life of any Specification
              Material with which the Tessera Trademarks are used to market or
              promote such Specification Material at the termination of this
              Agreement. Tessera further warrants that DCC shall be the only
              silicone supplier authorized by Tessera to use such Tessera
              Trademarks for a period of two (2) years from the first
              Commercialization Date of each of the following types of
              Specification Materials: (1) encapsulants; (2) compliant
              interposer pad material; and (3) die attach/adhesives. DCC agrees
              that it will do nothing inconsistent with Tessera's ownership of
              the Tessera Trademarks and that all use of the Tessera Trademarks
              by DCC shall inure to the benefit of and be on behalf of Tessera.
              DCC further agrees that nothing in this Agreement shall give DCC
              any right, title or interest in the Tessera Trademarks other than
              the right to use the Tessera Trademarks in accordance with this
              Agreement for the marketing and promotion of Specification
              Materials to Tessera Licensees.

       3.12   Consent. DCC agrees that prior to using any Tessera Trademark in
              the marketing or promotion of a Specification Material, DCC shall
              seek Tessera's consent for each use of a Tessera Trademark.
              Tessera shall have thirty (30) days within which to object to each
              such proposed use of a Tessera Trademark. Any modification to a
              marketing or promotional item subsequent to Tessera's consent
              shall require a new consent from Tessera unless it follows a form
              of trademark use which may be set forth and/or modified by Tessera
              from time to time.

       3.13   Form of Use. All of the Tessera Trademarks, save for "TCMT" and
              "Micro BGA", are federally registered by the U.S. Trademark
              Office. As such, DCC shall use the "(R)" symbol adjacent the
              Tessera Trademarks in all titles and headings and other prominent
              uses of the Tessera Trademarks and shall also use its best efforts
              to use the "(R)" symbol on at least the first and most obvious use
              of each Tessera Trademark within any printed material.

* Certain information on this page has been omitted and filed
  separately with the Commission. Confidential treatment has
  been requested with respect to the omitted portions.

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              "TCMT" and "Micro BGA" are common law trademarks of Tessera. As
              such, DCC shall use the "TM" symbol adjacent these marks in all
              titles and headings and other prominent uses of the TCMT or Micro
              BGA marks and shall also use its best efforts to use the "symbol
              on at least the first and most obvious use of each such mark
              within the text of any printed material.

              Each such marketing or promotional item shall further contain the
              following text: "_____ (List of the Tessera Trademarks used in the
              marketing item) are registered trademarks of Tessera, Inc." or a
              suitable variant thereof to account for a singular use of a
              Tessera Trademark. Further, DCC shall use its best efforts to use
              the Tessera Trademarks as modifiers in conjunction with generic
              nouns, e.g. the (mu)BGA(R) package.

3.2    Patents.

       3.21   Tessera Technology. Tessera hereby grants DCC a non-exclusive,
              non-transferable, non-sublicenseable, perpetual, royalty-free
              right to make, use and sell products embodying Tessera's Low
              Solvent Swell Material and associated Technology directed to such
              Low Solvent Swell Materials solely for the purpose of
              manufacturing Semiconductor Grade Materials for sale to Tessera
              and Tessera's Licensees for the packaging of microelectronic
              devices, as limited by the terms and provisions set forth in this
              Agreement.

              Further, Tessera hereby grants DCC a non-exclusive,
              non-transferable, non-sublicenseable, perpetual, royalty-free
              right to make, use and sell products embodying Tessera's Low
              Solvent Swell Material Technology and patents directed to such Low
              Solvent Swell Material Technology generally outside of the area of
              Semiconductor Grade Materials, as limited by the terms and
              provisions set forth in this Agreement.

       3.22   Apportionment of Patent Rights in Joint Inventions. DCC shall
              assign all Device Patents to Tessera: A Device Patent shall be
              deemed to be any U.S. patent, U.S. patent application, foreign
              patent or foreign patent application on a Joint Invention with
              claims drawn solely to Device Claims. A Device Claim shall be
              deemed to be any claim drawn to a microelectronic packaging
              device, a microelectronic component, a method of producing such
              devices or a method of producing such components. DCC shall assign
              all Use Patents in the area of microelectronic packaging to
              Tessera: A Use Patent in the area of microelectronic packaging
              shall be deemed to be any U.S. patent, U.S. patent application,
              foreign patent or foreign patent application on a Joint Invention
              with claims drawn solely to Use Claims. A Use Claim shall be
              deemed to be any claim drawn to a use of a Semiconductor Grade
              Material within: a microelectronic packaging device, a
              microelectronic component, a method of producing such devices or a
              method of producing such components. Tessera shall assign all
              Composition of Matter Patents to DCC. A Composition of Matter
              Patent shall be deemed to be any U.S. patent, U.S. patent
              application, foreign patent or foreign patent application on a
              Joint Invention with claims drawn solely to Composition of Matter
              Claims. A Composition of Matter Claim shall be deemed to be any
              claim drawn to a silicone product, intermediate or formulation: a
              method of preparing a silicone product, intermediate or
              formulation: or a method of delivering a silicone product,
              intermediate or formulation.

              When a Semiconductor Grade Material of a Use Claim of any Use
              Patent reads on any claim of any Composition of Matter Patent,
              then such Use Patent shall be deemed a

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       "Corresponding Use Patent" to such Composition of Matter Patent.
       Notwithstanding the immediately preceding paragraph regarding the
       apportionment of rights in joint patents, if (i) a Composition of Matter
       Patent is not obtainable in a particular country, despite reasonable
       efforts by DCC to obtain such patent in such country, and (ii) a
       Corresponding Use Patent is obtainable in such country, then: (a) DCC
       shall not be under an obligation to assign its rights in such
       Corresponding Use Patent in such country to Tessera; and (b) neither
       party shall license any third party to practice the invention of such
       Corresponding Use Patent without the other party's consent. However,
       neither party shall unreasonably withhold such consent. A refusal by
       either party to grant such consent is deemed reasonable if the
       prospective licensee refuses to pay a reasonable royalty to such party
       for the right to practice the invention of such Corresponding Use Patent.

       The ownership rights of all other patents and patent applications on
       Joint Inventions, including those patents and patent applications having
       both Device Claims and Composition of Matter Claims, shall be determined
       according to law of the United States.

       Tessera shall have a fully paid, non-royalty bearing, non-transferable,
       perpetual, non-sublicenseable right to use any silicone product,
       intermediate, formulation and any method of delivery of any silicone
       product, intermediate or formulation of any Joint Invention for the
       production or packaging of any microelectronic device.

       Nothing in this Agreement shall be construed as to curtail DCC's rights,
       to make, use, sell, license, and sub-license the technology of any
       Composition of Matter Patent in any and all areas outside of the area of
       microelectronic packaging.

       Tessera and DCC shall reasonably consult with one another with respect to
       drafting, timing for applying for, and prosecuting patent applications
       and enforcing the resulting patents on Joint Inventions. The parties
       hereto shall execute such documents and render such assistance as may be
       appropriate to enable a party or both parties hereto to apply for,
       obtain, maintain and enforce patents on Joint Inventions.

       DCC shall be solely responsible for fees associated with the filing,
       prosecution, maintenance and enforcement of all Composition of Matter
       Patents. Tessera shall be solely responsible for the fees associated with
       the filing, prosecution, maintenance and enforcement of all Device
       Patents. Tessera and DCC shall share equally in the costs associated with
       the filing, prosecution, maintenance and enforcement of all jointly owned
       patents on Joint Inventions. Either party may terminate responsibility
       for future financial obligations relating to jointly owned patents and
       jointly owned patent applications on Joint Inventions by relinquishing
       ownership rights in such Joint Inventions to the other party. If either
       party so relinquishes such ownership rights, the relinquishing party
       shall have a fully paid, non-royalty bearing, non-transferable,
       perpetual, non-sublicenseable right to make, use and sell the invention
       of the relinquished patent.

       Such apportioned Joint Invention rights shall not include any right of
       license by implication with respect to any portion of the other party's
       Technology or unrelated patents.

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TESSERA/DOW CORNING CONFIDENTIAL

4.0    TECHNICAL EXCHANGE MEETINGS AND REPORTS

4.1    DCC agrees to provide written reports and technical updates on DCC's
       Improvements on at least a quarter-year basis to Tessera during the term
       of this Agreement at mutually agreed scheduled technical exchange
       meetings.

4.2    Tessera agrees to provide written reports and technical updates on
       Tessera's Improvements on at least a quarter-year basis to DCC during the
       term of this Agreement at mutually agreed scheduled technical exchange
       meetings.

5.0    MANAGEMENT OF CONFIDENTIAL INFORMATION

5.1    Confidentiality Period. The respective duties to hold the Confidential
       Information in confidence shall expire five (5) years from the date of
       disclosure and shall not be used except in accordance with this
       Agreement.

5.2    Standard of Care. Tessera and DCC shall hold in confidence and protect
       the other party's disclosed Confidential Information using a degree of
       care at least equal to that exercised with their own valuable
       Confidential Information (but never less than a reasonable degree of
       care) and shall not disclose such Confidential Information to any third
       party provided that the receiving party may disclose Confidential
       Information or information derived therefrom to those of its employees or
       contract employees who: (1) have a need to know such information to
       achieve the purposes of this Agreement; (2) have been notified that such
       information is confidential; and (3) have executed a written agreement
       requiring employees and contract employees to safeguard confidential
       information generally. Both Tessera and DCC agree that there is a duty to
       promptly advise the disclosing party of any unauthorized disclosure or
       use of Confidential Information. In the event either party considers
       certain information, data or samples provided by the other party to be
       excluded from the above obligation of confidence and intends to make
       disclosure of such information to a third party, the receiving party
       shall give the disclosing party at least thirty (30) days prior written
       notice of the information to be disclosed and the basis upon which the
       information is believed to be excluded from the obligation of confidence.

5.3    Documentation Manager. Both DCC and Tessera shall designate a
       Documentation Manager to perform the task of logging and tracking the
       confidential documents transferred between the companies. If possible,
       each written transfer of confidential information will be copied by the
       parties to their respective Document Managers. Tessera's Documentation
       Manager is Christopher M. Pickett, Director of Intellectual Property and
       may be contacted at the Tessera fax and street address. DCC's
       Documentation Manager is Marlene Gladstone, Technical Service Specialist
       and may be contacted at Dow Corning Corporation, 910 Auburn Court,
       Fremont, CA 94538, facsimile number (510) 490-0650.

5.4    Employee Agreements. Both parties hereto represent that all of their
       employees, including contract employees, shall be under an obligation to
       assign ideas and inventions (by agreement or by operation of law) to
       their respective employer prior to having access to Confidential
       Information received hereunder.

5.5    Wrongful Disclosure of Confidential Information. If the owner of the
       Confidential Information believes that the other party to the Agreement
       has made a wrongful disclosure of Confidential Information, the owner
       shall send a written notification (by facsimile or one day courier to the
       other party detailing the wrongful disclosure. The other party will have
       thirty (30) days from the

                                    Page 9 of 25

<PAGE>   10

TESSERA/DOW CORNING CONFIDENTIAL

       transmission or mailing date of such notification to either provide an
       explanation why no wrongful disclosure has occurred or to mitigate the
       effects of the wrongful disclosure. It is understood and agreed by the
       parties that a wrongful disclosure of Confidential Information is
       considered a terminable breach of this Agreement at the option of the
       owner of the Confidential Information which was wrongfully disclosed.

6.0    MANAGEMENT OF TRADE SECRETS

6.1    Confidentiality Period of Trade Secrets. The respective duties to hold
       the Trade Secrets in confidence shall expire Thirty (30) years from the
       date of disclosure and shall not be used except in accordance with this
       Agreement.

6.2    Standard of Care. Tessera and DCC shall hold in confidence and protect
       the other party's disclosed Trade Secrets using a degree of care at least
       equal to that exercised with their own valuable Trade Secrets (but never
       less than a reasonable degree of care) and shall not disclose such Trade
       Secrets to any third party provided that the receiving party may disclose
       Trade Secrets or information derived therefrom to those of its employees
       who: (1) have a need to know such information to achieve the purposes of
       this Agreement; (2) have been notified that such information is
       confidential; and (3) have executed a written agreement requiring
       employees to safeguard confidential information generally. Both Tessera
       and DCC agree that there is a duty to promptly advise the disclosing
       party of any unauthorized disclosure or use of Trade Secrets. In the
       event either party considers certain information, data or samples
       provided by the other party to be excluded from the above obligation of
       confidence and intends to make disclosure of such information to a third
       party, the receiving party shall give the disclosing party at least
       thirty (30) days prior written notice of the information to be disclosed
       and the basis upon which the information is believed to be excluded from
       the obligation of confidence.

6.3    Documentation Manager. As stated in Paragraph 5.3, both DCC and Tessera
       shall designate a Documentation Manager to perform the task of logging
       and tracking the Trade Secret information and documents transferred
       between the companies. As of the Effective Date, each written transfer of
       Trade Secret information will be transferred first between the parties
       respective Documentation Managers. The receiving Documentation Manager
       will then control the dissemination of the disclosing party's Trade
       Secrets.

6.4    Wrongful Disclosure of Trade Secrets. If the owner of the Trade Secret
       believes that the other party to the Agreement has made a wrongful
       disclosure of Trade Secret, the owner shall send a written notification
       (by facsimile or one day courier) to the other party detailing the
       wrongful disclosure. The other party will have thirty (30) days from the
       transmission or mailing date of such notification to either provide an
       explanation why no wrongful disclosure has occurred or to mitigate the
       effects of the wrongful disclosure. It is understood and agreed by the
       parties that a wrongful disclosure of Trade Secret is considered a
       terminable breach of this Agreement at the option of the owner of the
       Trade Secret which was wrongfully disclosed.

7.0    TERM & TERMINATION

7.1    Term. This Agreement shall bind the parties beginning on the Effective
       Date and, unless earlier terminated as provided for elsewhere in this
       Agreement, shall remain in full force until it automatically expires on
       the fourth (4th) anniversary of the Effective Date, provided that Tessera
       and DCC may extend the Agreement by mutual written consent, dated and
       signed by both parties hereto.

                                   Page 10 of 25

<PAGE>   11

TESSERA/DOW CORNING CONFIDENTIAL

7.2    Written Termination. After the first anniversary of the Effective Date,
       either party to this Agreement may terminate the Agreement at will by
       giving the other party sixty (60) days written notice. Upon such
       termination, the cooperative development efforts will cease; however,
       Tessera and DCC will continue to be bound by the terms of this Agreement,
       as set forth in Paragraph 7.5.

7.3    Termination for Breach. Either party may terminate this Agreement by
       giving the other party sixty (60) days prior written notice upon the
       breach of any material provision of this Agreement by such other party.
       Such termination shall become effective if the breach is not cured within
       sixty (60) days after written notice thereof to the party responsible for
       such breach.

7.4    Return of Confidential Information and Components. Upon termination of
       this Agreement, both parties will use reasonable efforts to return or
       destroy all tangible Confidential Information, materials and components
       and partial components made under this Agreement, unless same have been
       paid for by Tessera. Confidential Information contained on data storage
       media shall be deleted therefrom. However, one copy of the Confidential
       Information may be retained in a restricted file for archival purposes,
       which file shall be kept in the custody of a single named employee, whose
       identity will be specified by notice to the other party hereto.

7.5    Survival Clause. Unless otherwise provided elsewhere in this Agreement,
       the following provisions shall survive the termination or expiration of
       this Agreement:

       7.51   Paragraphs 2.3, 2.4, 2.5 et seq., 2.6, 2.7, 2.9, and 2.10.

       7.52   Paragraph 3.0 et seq. unless such termination is a result of
              Paragraph 7.3, in which case the rights and licenses granted in
              Paragraphs 3.1 et seq. and 3.21 shall be terminated.

       7.53   Paragraph 5.0 et seq., Management of Confidential Information.

       7.54   Paragraph 6.0 et seq., Management of Trade Secrets.

       7.55   Paragraph 8.0, No Warranties.

       7.56   Paragraph 9.0, Limitation on Damages.

       7.57   Paragraph 10.0 et seq., Miscellaneous.

8.0    NO WARRANTIES

       Tessera and DCC acknowledge and agree that the rights and licenses,
       Technology and Specification Materials granted or otherwise provided
       hereunder are provided to the other party "AS IS", with no warranty of
       any kind. TESSERA and DCC MAKE NO WARRANTY, EXPRESS, IMPLIED, STATUTORY
       OR OTHERWISE, CONCERNING THE SUBJECT MATTER OF THIS AGREEMENT, INCLUDING
       WITHOUT LIMITATION, WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE,
       QUALITY, USEFULNESS OR NONINFRINGEMENT. Tessera and DCC make no
       warranty that the Technology or Specification Materials will be
       sufficient or yield any particular result.

9.0    LIMITATION ON DAMAGES:

                                   Page 11 of 25

<PAGE>   12
TESSERA/DOW CORNING CONFIDENTIAL

       IN NO EVENT SHALL EITHER PARTY BE LIABLE TO THE OTHER PARTY OR ANY OTHER
       PERSON OR ENTITY (UNDER ANY CONTRACT, NEGLIGENCE, STRICT LIABILITY OR
       OTHER THEORY) FOR SPECIAL, INCIDENTAL, CONSEQUENTIAL OR LIQUIDATED
       DAMAGES ARISING OUT OF OR RELATED TO THE SUBJECT MATTER OF THIS
       AGREEMENT, EVEN IF THE PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
       DAMAGES OR LOSSES.

10.0   MISCELLANEOUS: The following additional terms shall apply to this
       Agreement:

10.1   Governing Law & Dispute Resolution. The parties further agree this
       Agreement shall be governed by and construed under the laws of the State
       of California, irrespective of choice of law provisions. Both parties
       shall use their best efforts to resolve by mutual agreement any disputes,
       controversies, claims or difference which may arise from, under, out of
       or in connection with this Agreement. Disputes arising directly under the
       terms of this Agreement or the grounds for termination thereof shall be
       resolved as follows: (1) First, within forty-five (45) days of the first
       notification of such a dispute, the management of both parties shall meet
       to attempt to resolve such disputes; (2) If the disputes cannot be
       resolved by the management within the forty-five (45) days set forth
       above, either party may then make a written demand for binding
       arbitration of the dispute. Subject to the terms of this arbitration
       provision, the rules of the arbitration shall be agreed upon by the
       Parties prior to the arbitration and based upon the nature of the
       disagreement. To the extent that the Parties cannot agree on the rules of
       the arbitration, then the Commercial Arbitration Rules of the American
       Arbitration Association ("AAA") in effect on the Effective Date of this
       Agreement, and except as the applicable rules are modified by this
       Agreement, shall apply. The proceedings shall be held in San Jose,
       California, U.S.A. under the auspices of the AAA. As a minimum set of
       rules in the arbitration the Parties agree as follows:

       (1)    The arbitration shall be held by single arbitrator mutually
              acceptable to both Parties. If the Parties cannot agree on a
              single arbitrator within thirty (30) days from the date written
              demand is made, each Party shall identify one independent
              individual who shall meet to appoint a single arbitrator. If an
              arbitrator still cannot be agreed upon within an additional thirty
              (30) days, one shall be appointed by the AAA. The arbitrator shall
              be at least generally knowledgeable regarding the use of materials
              in the packaging of microelectronics;

       (2)    Neither Party shall sue the other where the basis of the suit is
              within the scope of this section except for enforcement of the
              arbitrator's decision in the event that the other Party is not
              performing in accordance with the arbitrator's decision;

       (3)    Any arbitration proceeding hereunder shall be conducted on a
              confidential basis;

       (4)    The arbitrator shall apply the substantive laws of the State of
              California in interpreting and resolving disputes;

       (5)    The Parties shall agree upon what, if any, discovery shall be
              permitted. If the Parties cannot agree on the form of discovery
              within thirty (30) days after the appointment of the arbitrator,
              then the arbitrator shall set forth the limits of discovery. In no
              event, however, shall any such discovery take more than three
              months from the date the limits of discovery have been defined;

       (6)    The duty of the parties to arbitrate any dispute within the scope
              of this Arbitration provision shall survive the expiration or
              termination of this Agreement. The Parties specifically agree that
              any action must be brought, if at all, within two (2) years from
              the accrual of the cause of action;

       (7)    The discretion of the arbitrator to fashion remedies hereunder
              shall be no broader than the legal and equitable remedies
              available to a court. This Arbitration provision shall

                                   Page 12 of 25

<PAGE>   13
TESSERA/DOW CORNING CONFIDENTIAL

              govern if any conflict arises between this Arbitration provision
              and any other remedy terms in this Agreement;

       (8)    Disputes as to the validity or scope of any patent shall not be
              subject to arbitration unless the party owning such patent
              consents to the arbitration. If such a dispute cannot be settled
              by agreement of the parties and the party owning the patent does
              not consent to arbitration, then such dispute shall be settled by
              a court of competent jurisdiction in the nation which issued the
              patent in question; and

       (9)    The decision of the arbitrator shall be final and binding upon the
              parties hereto and the expense of the arbitration (including
              attorneys' fees) shall be paid as the arbitrator determines.

10.2   No Waiver. No failure or delay on either party in the exercise of any
       right or privilege hereunder shall operate as waiver thereof, nor shall
       any single or partial exercise of such right or privilege preclude other
       or further exercise thereof or any other right or privilege.

10.3   Export Regulations. Both parties shall comply with the laws and
       regulations of the government of the United States, and of any other
       country as applicable relating to the export of commodities and technical
       data, any direct product of such data, or any product received from the
       other party, to any proscribed country listed in such laws and
       regulations unless properly authorized by the appropriate government, and
       not knowingly export, or allow the export or re-export of any Technology
       or Confidential Information, or any system, component, item, material or
       package made under or using the foregoing, in violation of any
       restrictions, laws or regulations, or without all required licenses and
       authorizations, to Afghanistan, the People's Republic of China or any
       Group Q, S, W, Y or Z country specified in the then current Supplement
       No. 1 to Section 770 of the US Export Administration Regulations (or any
       successor supplement or regulations).

10.4   Modifications. All additions, modifications or waivers to this Agreement
       must be made in a writing signed by both parties and specifically
       referring to this Agreement.

10.5   Notices. All notices, required documentation, and correspondence in
       connection herewith shall be in the English language, shall be provided
       in writing and shall be given by facsimile transmission or by registered
       or certified letter to Tessera and DCC at the addresses and facsimile
       numbers set forth below:

          Tessera:          Tessera, Inc.
                            3099 Orchard Dr.
                            San Jose, California 95134
                            Facsimile No.: 408-894-0768
                            Attn.: Chief Executive Officer
          DCC:              Dow Corning Corporation
                            2200 West Salzburg Road
                            Auburn, MI 48611
                            Facsimile: (517) 496-6354
                            Attn.: General Patent Counsel

       Either Party may change its address and/or facsimile number by giving the
       other party notice of such new address and/or facsimile number. All
       notices if given or made by registered or certified letter shall be
       deemed to have been received on the earlier of the date actually received

                                   Page 13 of 25

<PAGE>   14

TESSERA/DOW CORNING CONFIDENTIAL

       and the date three days after the same was posted and if given or made by
       facsimile transmission shall be deemed to have been received at the time
       of dispatch, unless such date of deemed receipt is not a business day, in
       which case the date of deemed receipt shall be the next succeeding
       business day.

10.6   Invalidity. If any provision of this Agreement is declared invalid or
       unenforceable by a court having competent jurisdiction, it is mutually
       agreed that this Agreement shall endure except for the part declared
       invalid or unenforceable by order of such court. The parties shall
       consult and use their best efforts to agree upon a valid and enforceable
       provision which shall be a reasonable substitute for such invalid or
       unenforceable provision in light of the intent of this Agreement.

10.7   Assignment. Neither party may assign this Agreement or any of its rights
       or obligations hereunder without the prior written consent of the other
       party, except when a party hereto either re-incorporates its business or
       sells substantially all of its assets to a single third party entity (not
       including a sale of assets pursuant to a bankruptcy proceeding).

10.8   Section Headings. The headings and captions used herein shall not be used
       to interpret or construe this Agreement.

10.9   Agreement Confidentiality. Tessera and Licensee agree that the terms of
       this Agreement are confidential (but not the existence of the Agreement)
       and shall not be disclosed to third parties without the prior consent of
       the other party.

10.10  Entire Agreement. This Agreement embodies the entire understanding
       between the parties relating to the subject matter hereof, whether
       written or oral, and supersedes all prior representations, warranties or
       agreements between the parties not contained in this Agreement. Any
       amendment or modification of any provision of this Agreement must be in
       writing, dated and signed by both parties hereto.

       IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as of the date first above written.

Tessera, Inc

By: /s/  JOHN W. SMITH                    By:  /s/  LEON D. CROSSMAN
   ----------------------------              ---------------------------------
Print Name: John W. Smith                 Print Name: Dr. Leon D. Crossman
Title: President & CEO                    Title: Vice President & Executive
                                                 Director, Science & Technology
Date:     5/10/97                         Date:     5/12/97
     --------------------------                -------------------------------

                                   Page 14 of 25

<PAGE>   15
                              [TESSERA LETTERHEAD]

                                                                 August 11, 1997

VIA FACSIMILE

Ms. Paula Lagatutta
Patent Attorney
Dow Corning Corporation

RE:  Extension to Paragraph 1.6 of the Joint Development Agreement

Dear Paula:

As discussed on the telephone on August 8, 1997, Tessera is requesting a
retroactive extension to the obligation to identify Tessera's Trade Secret
information transferred prior to the Effective Date of the Joint Development
Agreement between Dow Corning Corporation and Tessera, Inc. ("Agreement"). The
exact wording of the pertinent portion of the Agreement reads:

     1.6  "Trade Secret" means Technology or information that is disclosed to
     the other party prior to the expiration or termination of this Agreement
     and that: (i) derives independent economic value, actual or potential, from
     not being generally known to, and not being readily ascertainable by proper
     means by persons who can obtain economic value from its disclosure or use;
     (ii) is the subject of efforts that are reasonable under the circumstances
     to maintain its secrecy; and (iii) is disclosed to the other party and
     designated, in written form, as a trade secret. The parties acknowledge
     that they have been working together since September 1996 on Specification
     Materials and that certain Specification Materials that have been developed
     to date may have used the Trade Secret information of at least one of the
     parties. Tessera and DCC agree that Trade Secrets transferred prior to the
     Effective Date shall fall within the terms of this Agreement provided the
     respective parties identify such information to the other party within
     ninety (90) days of the Effective Date of this Agreement.

Tessera is requesting an extension to August 22, 1997 to further allow us to
collect the trade secret information provided to Dow Corning prior to the
Effective Date. If Dow Corning agrees to this extension, please have an
authorized representative sign and date this letter below.

Best regards,

/s/ CHRIS PICKETT
------------------------
Chris Pickett
Director of Intellectual Property
Tessera, Inc.

Dow Corning Corporation

Signature: /s/ LEON D. CROSSMAN
          ------------------------------

Print Name:  LEON D. CROSSMAN
          ------------------------------

Date:        August 13, 1997
     -----------------------------------

<PAGE>   16
                            [DOW CORNING LETTERHEAD]

                                                         LEGAL/PATENT DEPARTMENT

June 5, 1997

Chris Pickett
Tessera, Inc.
3099 Orchard Drive
San Jose, CA 95134

Dear Mr. Pickett:

     Dow Corning Toray Silicone Company, Ltd. (hereinafter "DCTS"), pursuant to
paragraph 1.13 of the joint development agreement between Dow Corning
Corporation and Tessera, Inc., having an effective date of May 12, 1997,
amended effective June 3, 1997, and a copy of which is enclosed (hereinafter
"Agreement"), hereby agrees to be bound by the terms of this Agreement.

     Please have an authorized officer of Tessera execute all three copies of
this letter and return two copies to:

               Paula Lagattuta, Esq.
               Dow Corning Corporation
               Patent Department - Mail CO1232
               Midland, Michigan 48686-0994

     If there are any questions regarding this agreement, please contact Paula
Lagattuta at (517) 496-5712.

ACCEPTED:                                         Very truly yours,

TESSERA, INC.                                     DOW CORNING CORPORATION

By: /s/ JOHN W. SMITH                             By: /s/ LEON D. CROSSMAN
   -------------------------------                   ---------------------------
                                                     LEON D. CROSSMAN
Typed Name:  JOHN W. SMITH                           V.P. & Executive Director
           ------------------------------            Science & Technology

Title:  President
      -----------------------------------

Date:  10-29-97                                    Date: June 16, 1997
     ------------------------------------                -----------------------

DOW CORNING TORAY SILICONE COMPANY, LTD

By:  /s/ MASAYOSHI SHIMOI
   --------------------------------------

Typed Name: Masayoshi Shimoi
           ------------------------------
       Managing Director, General Manager
Title: Mkt'g & Sales Div.
      -----------------------------------

Date:   September 11, 1997                                          ACCNO. 20328
     ------------------------------------<PAGE>   1
                                                                   EXHIBIT 10.23

                             TECHNOLOGY LICENSE AND

                         TECHNICAL ASSISTANCE AGREEMENT

                                     BETWEEN

                               TOSHIBA CORPORATION

                                       AND

                                  TESSERA, INC.

                                       FOR

                                  mBGA PACKAGE

Toshiba/Tessera confidential

<PAGE>   2

     TECHNOLOGY LICENSE AND TECHNICAL ASSISTANCE AGREEMENT FOR mBGA PACKAGE

This Agreement is made and entered into as Aug 29, 2000 ("Effective Date") by
and between Toshiba Corporation, a Japanese corporation with a principal place
of business at 1-1, Shibaura 1-chome, Minato-ku, Tokyo 105-8001, Japan,
("Toshiba"), and Tessera, Inc. a corporation organized under the laws of
Delaware, with a principal place of business at 3099 Orchard Drive, San Jose, CA
95134 U.S.A. ("Tessera").

WHEREAS, TOSHIBA has been engaged in the design, manufacture and sale of a
certain package for semiconductor integrated circuit; and

WHEREAS, Tessera desires to obtain from Toshiba, and Toshiba is willing to
furnish and grant the right to provide to Tessera Licensee (as hereinafter
defined), certain technical information for the manufacture of a certain package
for semiconductor integrated circuit, in accordance with the terms and
conditions hereinafter set forth; and

WHEREAS, Toshiba and Licensee each represents that it is fully authorized to
deal generally with and to make an agreement respecting the subject matter
hereof;

NOW, THEREFORE, in consideration of the mutual covenants and premises contained
herein, the parties agree as follows:

ARTICLE 1. PRIOR AGREEMENT

Toshiba and Tessera have entered into a TCC License Agreement, dated April 1,
1999 ("Tessera/Toshiba TCC License Agreement"), under which Tessera licensed
Tessera Patents to Toshiba relating to a type of integrated circuit package
called the Tessera Compliant Chip ("TCC"), and the terms of that Tessera/Toshiba
TCC License Agreement are incorporated herein by reference. Capitalized terms
used in this Agreement but not defined herein shall have the meanings stated in
the Tessera/Toshiba TCC License Agreement. If a conflict arises between a term
or provision in this Agreement and one in the Tessera/Toshiba TCC License
Agreement, the term or provision in this Agreement shall prevail.

Toshiba/Tessera Confidential

                                       1

<PAGE>   3

ARTICLE 2. DEFINITIONS

The following terms whether used in singular or plural form shall have the
following meanings for purposes of this Agreement:

2.1 "mBGA" shall mean a type of TCC where the contact-bearing surface of the IC
device faces towards the external electrical terminals and electrical
connections between IC contacts on the IC device and the electrical terminals on
the package substrate are partly formed by bonding wires.

2.2 "Contract Product" shall mean the mBGA listed in Exhibit 1 attached
hereto.

2.3 "Toshiba Technical Information" shall mean the documentation listed in
Exhibit 2 containing technical and engineering information, know-how,
trade-secrets, proprietary information, and data concerning the manufacture of
Contract Product, which documentation is contained in the authorized files of
Toshiba and is commercially in use by Toshiba.

        It is understood, however, that, Technical Information does not include
the following information and data:

        (i) cost and marketing information;

        (ii) information and data related to mBGA which is under development;

        (iii) information and data specifically for the manufacture of
        individual component materials and component parts of Contract products;

        (iv) information and data specifically for the manufacture of machines,
        apparatus, dies, jigs, and tools used in manufacturing mBGA;

        (v) information and data which Toshiba does not have a right to disclose
        or disclose of which require the payment of compensation to a third
        party; and

        (vi)information and data which is not owned by Semiconductor Company
        inside Toshiba or any other division or organization succeeding thereto.

Toshiba/Tessera Confidential

                                       2

<PAGE>   4
        2.4 "Toshiba Patents" shall mean those patents(including utility models)
        and patent applications of any country of the world (a) owned or
        controlled by Toshiba at any time prior to the expiration or termination
        of this Agreement, (b) under which Toshiba has or may acquire the right
        to grant a license without incurring obligation or payment of
        compensation to any third party, and (c) covering inventions relating to
        the manufacture or assembly of mBGA.

2.5 "Technical Assistance" shall mean technical discussions, lectures, guidance
and/or technical training given by Toshiba's personnel to technically qualified
personnel of Tessera at Toshiba's facilities in Japan or Tessera's facility in
the United States, concerning Technical Information furnished to Tessera and the
manufacture of Contract Product.

2.6 "Tessera Licensee" shall mean a party with which Tessera has entered into
TCC License Agreement as of the conclusion of this Agreement or a party with
which Tessera will enter into TCC License Agreement after the conclusion of this
Agreement.

2.7 "TCC License Agreement" shall mean an agreement to be executed between
Tessera and Tessera Licensee, the basic terms and conditions of which is
substantially same as those of Tessera/Toshiba TCC License Agreement.

2.8 "Tessera Technical Information" means technical and engineering information,
know-how, trade-secrets, proprietary information, and data concerning the
design, manufacture and assembly of TCC packages, which information is contained
in the authorized files of Tessera.

ARTICLE 3. TECHNICAL ASSISTANCE

3.1.    (i) Toshiba shall furnish to Tessera, on a nonexclusive basis, one set
        of the Technical Information relating to Contract Product within sixty
        (60) days after the Effective Date of this Agreement.

        (ii) Toshiba shall furnish to Tessera, on a nonexclusive and semi-annual
        basis, one copy of amendments or improvements made by Toshiba to
        original Technical information furnished to Tessera hereunder during the
        five-year period from the Effective Date of this Agreement,

        (iii) Toshiba shall make good faith reasonable efforts to furnish to
        Tessera, on a nonexclusive

Toshiba/Tessera Confidential

                                       3
<PAGE>   5
        and semi-annual basis, one copy of information on the registered Toshiba
        Patents, if any, during the five-year period from the Effective Date of
        this Agreement."

        (iv) Technical Information to be furnished to Tessera hereunder shall be
        prepared by Toshiba in English and in metric system measurements.

3.2 Each party shall appoint a Technical Coordinator soon after the Effective
Date hereof and immediately notify the other party thereof, who is responsible
for the coordination, implementation and supervision of all technical actions to
be taken under this Agreement, including but not limited to transmittal and
receipt of any technical information hereunder. The Technical Coordinators shall
meet on a semi-annual basis to discuss improvements in the Toshiba Technical
Information and Patents, if any.

3.3 In order for Tessera to better understand the Technical Information to be
furnished hereunder, Toshiba shall provide Tessera with Technical Assistance at
Toshiba's facility in Japan in accordance with the schedule to be agreed upon
by both parties and up to the number of Tessera man-days to be agreed upon by
both parties.

3.4 In addition to the Technical Assistance specified in the preceding Article
3.3, upon request of Tessera, Toshiba agrees to consider in good faith providing
Tessera with additional Technical Assistance during the five-year-period from
the Effective Date of this Agreement, subject to reasonable availability of
Toshiba's engineers and payment by Tessera to Toshiba at the rate of [*] U.S.
dollars (U.S.$[*]) per man-day of Toshiba's engineer who is to provide such
Technical Assistance at Toshiba's facility hereunder.

3.5 In order to assist Tessera in better understanding Technical Information
furnished to Tessera hereunder, Toshiba shall, upon the written request of
Tessera made during the term of this Agreement, provide Tessera with technical
response or correspondence answering the questions raised by Tessera. Provided,
however, that Tessera shall pay to Toshiba the actual cost incurred by Toshiba
in connection with such response or correspondence, and that in the event such
cost seems to be not small, Toshiba shall notify Tessera in advance of the
estimated amount of such costs.

3.6 It is understood that Technical Assistance is to be provided basically at
Toshiba's facilities in Japan, provided, however, that in the event that Tessera
requests Toshiba to dispatch Toshiba's personnel to Tessera's facilities in
order to provide the Technical Assistance due to unavoidable

Toshiba/Tessera Confidential

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                       4
<PAGE>   6
reason, Toshiba agrees to consider in good faith providing Tessera with such
Technical Assistance during the five-year-period from the Effective Date of this
Agreement, subject to reasonable availability of Toshiba's engineers and payment
by Tessera to Toshiba at the rate of [*] U.S. dollars (U.S.$[*]) per man-day of
Toshiba's engineer who is to provide such Technical Assistance at Tessera's
facilities hereunder.

3.7     (i) All expenses including travel and living expenses incurred by
        Toshiba's engineers in relation to the Technical Assistance provided for
        in this Article 3 shall be borne and paid by Tessera to Toshiba. All
        expenses and salaries of Tessera's technical people in relation to the
        Technical Assistance provided for in this Article 3 shall be borne by
        Tessera.

        (ii) Technical Assistance under the Article 3.6 shall be provided by
        Toshiba at Tessera's facility in U.S.A. in accordance with the terms and
        conditions of Exhibit 4 hereof.

        (iii) In the event that any interpreter is needed for the performance of
        Technical Assistance hereunder, any cost necessary for such interpreter
        shall be borne by Tessera.

3.8 Tessera shall pay to Toshiba in U.S. dollars the Technical Assistance fees
and expenses incurred by Toshiba's personnel under Articles 3.3 through 3.6 by
telegraphic transfer to the same bank account and in the same manner as set
forth in Article 6.6 within thirty (30) days after receipt of Toshiba's invoice.

3.9 Tessera shall deliver to Toshiba free of charge during the five-year-period
from the Effective Date of this Agreement technical information relating to
improvements, enhancements and modifications made by Tessera to the Technical
Information delivered by Toshiba to Tessera hereunder.

3.10 Tessera ensures that its engineers shall comply with the safety, security
and all other applicable laws, regulations, practices, and specific instructions
or directions to be made by Toshiba while Tessera's engineers are in Toshiba's
premises. Tessera shall indemnify and hold Toshiba harmless from any claims
arising out of any injuries, losses, damages or liabilities caused by Tessera's
engineers in connection with implementation of the Technical Assistance
hereunder.

Toshiba/Tessera Confidential

* Certain information on this page has been omitted and filed
  separately with the Commission. Confidential treatment has
  been requested with respect to the omitted portions.

                                       5

<PAGE>   7
3.11 Toshiba shall provide to Tessera one copy of information relating to
simulation models and results for the Contract Product pursuant to the paragraph
3.1.(i) hereof on the condition that Toshiba has had such information at that
time.

3.12 Toshiba shall use good faith reasonable efforts to assist Tessera in
locating a supplier to provide Tessera with prototype manufacturing and
demonstration services at favorable prices.

3.13 Toshiba will make public the relationship with Tessera set forth in this
Agreement, including cooperating on joint press releases and other promotion and
media-related activity. Further, both parties agree to position the relationship
positively to customers, analysts, the media, and in all public forums, although
the specific terms of this agreement will remain confidential.

ARTICLE 4. OWNERSHIP

Except as provided herein, all titles and interests to any technical information
that are delivered by Toshiba hereunder, including Technical Information, and
all intellectual property rights incorporated therein and/or resulting there
from shall at all times remain with Toshiba.

ARTICLE 5. RIGHTS AND LICENSES

5.1. Toshiba hereby grants to Tessera a non-exclusive and non-transferable right
to grant to Tessera licensee during the term of this Agreement a non-exclusive
and non-transferable sublicense under Toshiba's Patents, to manufacture and have
manufactured mBGA, and to use, sell or otherwise dispose of such mBGA in all
countries of the world. Tessera shall have the right under the Toshiba Patents
and Technical Information to make, use, and sell test vehicle and prototypes for
the sublicensing business granted to Tessera hereunder. Provided, however, that
Tessera's preceding right shall be exercised by Tessera only at the time when
Tessera shall exercise its right provided for Articles 5.2 and 5.3 hereof and
subject to the Article 5.6 hereof.

5.2 Toshiba hereby grants to Tessera an exclusive and non-transferable right to
grant to Tessera Licensee during the term of this Agreement a non-exclusive and
non-transferable sublicense to use the Technical Information delivered to
Tessera hereunder, in Tessera Licensee's manufacturing mBGA in all countries of
the world. Toshiba agrees not to disclose the Toshiba Technical

Toshiba/Tessera Confidential

                                       6
<PAGE>   8
Information to any other party, except to the corporations as provided for in
the paragraph 5.5 hereof.

5.3 Toshiba hereby grants to Tessera during the term of this Agreement an
exclusive and nontransferable right to provide Tessera Licensee with the
Technical Information delivered to Tessera hereunder and the technical
assistance in order to assist Tessera Licensee in better understanding such
Technical Information.

5.4 Tessera shall make a good faith reasonable effort to standardize the mBGA
TCC and broaden its market acceptance and Tessera shall make its best efforts to
license, market and promote the mBGA package and related technology.

In the event that Tessera cannot achieve the object set forth in this Article
5.4 in a manner and level satisfactory to Toshiba within the [*] ([*]) [*]
period from the Effective Date of this Agreement, Toshiba shall be entitled to
cancel Tessera's exclusive right provided for in the Articles 5.2 and 5.3,
provided, however, that such right remains as an nonexclusive right during the
term of this Agreement.

5.5 Notwithstanding the above, Toshiba shall have the right to directly enter
into the Technical Assistance Agreement with each company described below in
order to transfer the technology relating to the manufacture of mBGA to such
companies;

        (1) Payton Technology Corporation,

        (2) Power Technology, Inc.,

        (3) Walsin Advanced Electronics, Ltd., Walton Advanced Electronics, Ltd.
        and its successor,

        (4) A corporation which is to be used by Toshiba as its subcontractor
        for the manufacture of mBGA for the benefit of Toshiba, and

        (5) Toshiba's Affiliate.

5.6 Tessera agrees to include a provision in TCC License Agreements covering
mBGA that is substantially similar to the following text: "Licensee grants to
Toshiba a non-exclusive, nontransferable and paid-up license to manufacture,
have manufactured, use, sell, or otherwise dispose of mBGA under Licensee Patent
throughout the world during the term of such Licensee Patent."

5.7 In the event that Tessera has entered into a certain agreement with Tessera
Licensee for the

Toshiba/Tessera Confidential

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  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                       7
<PAGE>   9
purpose of providing Technical Information furnished to Tessera
hereunder, Tessera shall notify Toshiba thereof within thirty (30) days of the
conclusion of such agreement. Such notice shall indicate the name of Tessera
Licensee, effective date of agreement and other necessary information.

5.8 Tessera may develop an appropriate brand name for the mBGA technology and
may file for appropriate trademarks, which will be owned by Tessera, but will be
licensed to Toshiba, Toshiba Affiliate, and the three corporations provided for
the paragraph 5.5 free of charge for its use in the promotion and sale of its
mBGA packages.

ARTICLE 6. COMPENSATION

6.1 In addition to the reimbursements and payments elsewhere provided for
herein, Tessera agrees to make the following payments to Toshiba as compensation
for Technical Information and Technical Assistance furnished to Tessera and the
rights and licenses granted to Tessera hereunder: Tessera shall pay a royalty to
Toshiba based on the following percentages of royalties received by Tessera from
Tessera Licensees, including Toshiba, for their manufacture of mBGA TCCs using
Toshiba Patents and/or Technical Information: [*] percent ([*]%) of royalties
received by Tessera for each Tessera Licensee's cumulative manufacture of mBGA
TCC units up to [*] mBGA TCC packages, [*] percent ([*]%) of royalties received
for quantities between [*] mBGA TCC packages, and [*] percent ([*]%) of
royalties received for quantities exceeding [*] mBGA TCC packages.

6.2 Royalties under Article 6.1 shall be paid semiannually within sixty (60)
days after the end of June and December of Tessera's each fiscal year, or within
sixty (60) days after termination of this Agreement pursuant to Articles 10.2 or
10.3

6.3 All payments hereunder by Tessera to Toshiba shall be made without deduction
of any present or future tax, assessment or other governmental charge imposed
upon or as a result of such payments by the U.S.A (or any political subdivision
or taxing authority thereof or therein), and such taxes, assessments or charges,
if any, shall be borne and paid by Tessera, provided, however, that income taxes
or taxes of a similar nature (including withholding taxes) levied on such
payments by tax or other governmental authorities of the U.S.A and paid by
Tessera shall be deductible from the payments due to Toshiba if (a) such taxes
are allowable as a credit against taxes levied on Toshiba by the tax authorities
of Japan and (b) Toshiba notifies Tessera in writing when it believes there to

Toshiba/Tessera Confidential

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to the
  omitted portions.

                                       8
<PAGE>   10
exist such creditable amounts. Tessera shall send to Toshiba all certificates or
other verification on such tax payments as may be required by Toshiba or the tax
authorities of Japan as soon as practicable after such payment is made.

6.4 Tessera shall submit to Toshiba at each time of payment of royalty under
Article 6.1. and 6.2 hereof, a certified written statement signed by an
authorized officer of Tessera (as shown in Exhibit 3) specifying all royalties
received from each Tessera Licensee for mBGA packages and containing the
information sufficient to determine the royalties due Toshiba for the applicable
payment period.

6.5. Tessera agrees to keep true and accurate records, files and books of
account containing all the data necessary for the full computation and
verification of the royalty to be paid to Toshiba for mBGA and the information
to be given in the statement herein provided for, and also to permit the same to
be examined from time to time by Toshiba to the extent necessary for verifying
the royalty due and payable hereunder, but not more frequently than once per
year. Such examination shall be made at the expense of Toshiba by a person
appointed by Toshiba.

6.6 All payments by Tessera to Toshiba under this Agreement shall be made in
U.S. dollar by telegraphic transfer to Toshiba's account at the Sakura Bank
Ltd., Head Office in Tokyo, Japan; No.0949155 or to any other account designated
by Toshiba to Tessera in writing.

ARTICLE 7. WARRANTY AND LIMITATION OF LIABILITY

7.1 Nothing contained in this Agreement shall be construed as:

        (a) an agreement to bring or prosecute actions or suits against third
parties for infringement of intellectual property rights or any other right, or
conferring any right to bring or prosecute actions or suits against third
parties for infringement of intellectual property rights or any other right;

        (b) a warranty or representation that any technical information
transferred to Tessera and/or Tessera Licensee hereunder, or the manufacture,
use, sale or other disposal of any TCC by Tessera or Tessera Licensee using such
technical information, will be free from infringement of patents or any other
intellectual property rights of any third party;

Toshiba/Tessera Confidential
                                       9
<PAGE>   11
        (c) conferring the other party any right to use in advertising,
publicity or otherwise any trademark, trade name or names, any contraction,
abbreviation or simulations thereof of either party;

        (d) conferring the other party, by implication, estoppel or otherwise,
any license or other right, except for the licenses and rights expressly granted
hereunder; and

        (e) an obligation to furnish any technical information or know-how
except as otherwise specifically provided herein.

7.2 Neither party makes any warranty, express or implied, including implied
warranties of merchantability and fitness for a particular purpose with respect
to any technical information or technical assistance delivered to the other
party and/or a Tessera Licensee hereunder or any products manufactured by such
Tessera Licensee using such information. Tessera agrees to defend, indemnify and
hold Toshiba harmless from and against any and all damages, liabilities, costs
and expenses (including reasonable attorney's fees and expenses) arising out of
or related to Tessera's use of Toshiba Technical Assistance, Technical
Information and license or right provided by Toshiba. Likewise, Toshiba agrees
to defend, indemnify and hold Tessera harmless from and against any and all
damages, liabilities, costs and expenses (including reasonable attorney's fees
and expenses) arising out of or related to Toshiba's use of Tessera Technical
Information.

7.3 EXCEPT AS EXPRESSLY PROVIDED HEREIN, NEITHER PARTY MAKES ANY WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL EITHER
PARTY BE LIABLE FOR ANY SPECIAL, CONSEQUENTIAL, INDIRECT OR INCIDENTAL DAMAGES
INCLUDING, BUT NOT LIMITED TO LOST PROFITS OR OTHER COMMERCIAL LOSS, ARISING IN
ANY WAY OUT OF THIS AGREEMENT OR BASED ON TORT, NEGLIGENCE, PRODUCT LIABILITY,
OR OTHERWISE, AND WHETHER OR NOT ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

ARTICLE 8. CONFIDENTIALITY

8.1 "Proprietary Information" shall mean any information disclosed by one party
to the other

Toshiba/Tessera Confidential
                                       10
<PAGE>   12
party, which is in written, graphic, machine-readable or other
tangible form and is marked "Proprietary", "Confidential" or in some other
manner to indicate its confidential nature. Proprietary Information shall
specifically include the Toshiba Technical Information and Tessera Technical
Information delivered hereunder. Proprietary Information may also include oral
information disclosed by one party to the other party pursuant to this
Agreement, provided that such information is designated as confidential at the
time of disclosure and is reduced to writing by the disclosing party within
thirty (30) days from its oral disclosure, and such writing is marked in a
manner to indicate its confidential nature and delivered to the receiving party.

8.2 During the five-year period following receipt of Proprietary Information
from the other party hereunder, each party shall keep such Proprietary
Information in confidence and shall not disclose such information to any third
party without the prior written consent of the other party. Neither party shall
use the other party's Proprietary Information for purposes other than those
necessary to directly further the purposes of this Agreement and access to such
other party's information shall be restricted to those employees with a need to
know hereunder.

8.3 Each party shall not disclose the terms and conditions of this Agreement to
any third party, but the existence of this Agreement may be disclosed by either
party.

8.4 The confidentiality obligations provided in Articles 8.2 and 8.3 shall not
apply to:

        (a) any information, which is already known to the receiving party at
the time of disclosure by the other party;

        (b) any information, which is or becomes publicly known through no fault
of the receiving party;

        (c) any information which is rightfully received by the receiving party
from a third party after the time of disclosure without any restriction or
breach of this Agreement;

        (d) any information, which is provided by the disclosing party to a
third party without restriction on disclosure;

        (e) any information, which is independently developed by the receiving
party;

Toshiba/Tessera Confidential
                                       11
<PAGE>   13
        (f) any information or any terms and conditions of this Agreement which
is approved for release by written authorization of the other party; or

        (g) any information or any terms and conditions of this Agreement which
is required to be disclosed by the order of a governmental agency, legislative
body or a court of competent jurisdiction, provided that the required party
shall give the other party prompt notice of such request so that the other party
has sufficient opportunity to defend against, limit or protect such disclosure.

8.5 Each party acknowledges that any unauthorized dissemination or
misappropriation of the other's Proprietary Information transferred to the other
hereunder will constitute a material breach of this Agreement and would cause
irreparable injury to the disclosing party, for which monetary damages would not
be an adequate remedy and the disclosing party shall be entitled to equitable
relief (i.e. injunctive relief) in addition to any remedies it may have
hereunder or at law.

8.6 It is agreed that Tessera shall not have any right to have access to, and
Tessera ensures that its employees shall not have access to, any technical
information or data of Toshiba, which are not specifically authorized under this
Agreement, and that no right or license is granted to Tessera with respect to
said technical information or data.

ARTICLE 9. EXPORT CONTROL

Neither party shall export or re-export, directly or indirectly, any technical
information disclosed hereunder or direct product thereof to any destination
prohibited or restricted by the export control regulations of Japan and U.S.,
without the prior authorization from the appropriate governmental authorities.
Tessera hereby certifies that Tessera will not use any technical information
supplied by Toshiba hereunder for any purpose to develop or manufacture nuclear,
chemical, biological weapons or missiles (hereinafter "Weapons of Mass
Destruction"). Tessera further certifies that it will not sell any products
manufactured using any technical information supplied by Toshiba hereunder to
any party if it has actual knowledge that the end-user of such products will use
them for the development and/or manufacture of Weapons of Mass Destruction.

ARTICLE 10. TERM AND TERMINATION

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                                       12
<PAGE>   14
10.1 Except as provided elsewhere in this Article 10, this Agreement shall
become effective on the Effective Date hereof, and shall continue in effect so
long as the Tessera/Toshiba TCC License Agreement remains in force and effect,
unless earlier terminated as hereinafter provided in this Agreement.

10.2 If either party commits a material breach with respect to any of its
obligations under this Agreement, and such breach is not cured within sixty (60)
days after receipt of a written notice from the other party specifying the
material breach, then the other party may terminate this Agreement forthwith by
sending a written notice of termination to the breaching party. Termination of
this Agreement pursuant to this Article 10.2 shall not relieve the breaching
party from any liability arising from any breach of this Agreement and such
termination shall be without prejudice to any other rights and remedies of
non-breaching party provided at law or in equity, in addition to the rights and
remedies set forth in this Agreement.

10.3 Either party shall have the right to terminate forthwith this Agreement by
giving notice to the other party in the event that: (i) the other party becomes
the subject of a voluntary or involuntary petition in bankruptcy or any
proceeding relating to insolvency, or composition for the benefit of creditors,
if that petition or proceeding is not dismissed within sixty (60) days after
filing, (ii) the institution of any proceedings for the liquidation or winding
up of the other party's business or for the termination of the other party's
corporate charter, or (iii) the other party is merged into, or a majority
interest in equity of the other party or a majority of the other party's assets
are transferred to, a third party.

10.4 Upon expiration of this Agreement, all rights and licenses granted to and
the obligations undertaken by each party hereunder shall terminate, except for
each party's rights and licenses to use any technical information that has been
transferred to such party by the other party and which such party then possesses
on or before the date of expiration of this Agreement.

10.5 In case of termination by one party pursuant to Article 10.2 or 10.3 above,
all rights and licenses granted to the other party hereunder shall immediately
terminate, and the other party shall destroy or, at the notifying party's
request, return to the notifying party all technical information received from
the notifying party; provided, however, that if the terminating party is
Toshiba, the rights of Tessera Licensees granted hereunder prior to such
termination shall survive subject to the payment of royalties by Tessera
hereunder. All rights and licenses granted to the notifying party shall survive
such termination, subject to compensation payments, if any, pursuant to the
terms of

Toshiba/Tessera Confidential
                                       13
<PAGE>   15
this Agreement.

10.6 Notwithstanding any provisions of this Agreement, the provisions of
Articles 4, 6, 7, 8, 9, and 10 shall survive any termination or expiration of
this Agreement.

10.7 Except as otherwise provided herein above, all rights and licenses granted
hereunder shall immediately terminate upon expiration or termination of this
Agreement.

10.8 In the event that Tessera falls into the situation provided for the
subparagraph (i), (ii), or (iii) of the paragraph 10.3, and Toshiba cannot
terminate this Agreement against its will under any applicable laws of the U.S.,
Tessera's exclusive right provided for in the paragraph 5.2 and 5.3 hereof
shall be changed into Tessera's non-exclusive right.

ARTICLE 11. TESSERA LICENSEE'S COMPLIANCE

In the event that Tessera shall provide Tessera Licensee with the Technical
Information furnished hereunder pursuant to the Article 5.3, Tessera shall take
necessary contractual steps so that Tessera may cause Tessera Licensee to comply
with provisions similar to Articles 8 (Confidentiality), 9 (Export Control) and
10 (Term and Termination) hereof.

ARTICLE 12. GENERAL PROVISIONS

12.1 All notices and communications required or permitted to be given hereunder
shall be in writing in the English language and shall be by facsimile
transmission, delivered personally or mailed, and shall be effective when
received.

12.2 All such notices and communications shall be addressed to the following or
to such address as either party may designate in writing:

If to Toshiba:

[general contract matters]
Toshiba Corporation
1-1, Shibaura, 1-chome
Minato-ku, Tokyo 105-8001, Japan

Facsimile No.: (03) 5444 - 9342

Attention: General Manager
      Legal Affairs and Contracts Division
            Semiconductor Company

Toshiba/Tessera Confidential
                                       14
<PAGE>   16
[technical matters]
Toshiba Corporation
800, Yamanoisshiki-cho, Yokkaichi, Mie-Pref,
512-8550, Japan

Facsimile No.:(045)890-2792

Attention: Senior Manager
            Memory Packaging Engineering Department
            Yokkaichi Operations

If to Tessera:   Tessera, Inc.
                 3099 Orchard Dr.
                 San Jose, California 95134
                 Facsimile No.: 408-894-0768
                 Attn.: Chief Executive Officer

IN WITNESS THEREOF, the parties have executed this Agreement as of the date
herein below set forth.

TOSHIBA CORPORATION                          TESSERA, INC.

BY: /s/ SHIGEO KOGUCHI                       BY: /s/ BRUCE McWILLIAMS
   -------------------------------              --------------------------------

NAME: SHIGEO KOGUCHI                         NAME: BRUCE McWILLIAMS
     -----------------------------                ------------------------------

TITLE: V.P. Memory Division                  TITLE: CEO
      ----------------------------                 -----------------------------

DATE: AUGUST 29, 2000                        DATE: AUGUST 29, 2000
     -----------------------------                ------------------------------

Toshiba/Tessera Confidential
                                       15

<PAGE>   17
                                   EXHIBIT 1

CONTRACT PRODUCT

(1) 128M RDRAM (0.2 [Greek mu]) TC 59RM716MB

(2) 256M RDRAM(0.1752 [Greek mu])

    Model Name is to be decided upon the commencement of its commercial
    production at the first quarter of 2001

(3) other mBGA which Toshiba will commence the commercial production thereof
    during the period starting from the completion of the supply of
    Technical Information relating to the above two kinds of Contract
    Product through the time when four years will pass from the Effective
    Date of this Agreement.

    Technical Information relating to such other mBGA to be furnished by Toshiba
    shall be limited To Such Technical Information as are different from those
    which Toshiba has furnished before.

Toshiba/Tessera Confidential
                                       16
<PAGE>   18

                                   EXHIBIT 2

                      LICENSEE, TECHNICAL INFORMATION LIST

1.      Package Design

        1.1     Package Outline Drawings

        1.2     Tape Drawing

2.      Process Condition

        2.1     Assembly Flow Chart including Process Condition

        2.2     Qualification Control System Flow Chart

        2.3     In-Line Qualification Control Items and Spec.

        2.4     Visual Inspection Item and Spec.

        2.5     Confirm Items for Setting up New Products and Early Stage
                Products

3.      Raw Material

        3.1     Direct Materials' and Suppliers' List

        3.2     Indirect Materials' and Suppliers' List

        3.3     Material Spec. and their In-coming Inspection Item and Spec.

4.      Assembly Equipment

        4.1     Equipment Type and Suppliers' List

        4.2     Equipment Spec.

        4.3     Equipment Buyoff Conditions

        4.4     List of Jigs and Die (Drawings if necessary)

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<PAGE>   19

                                   EXHIBIT 3

                     ROYALTY REPORT UNDER TECHNOLOGY LICENSE
                       AND TECHNICAL ASSISTANCE AGREEMENT

REPORTING PERIOD: From ____________________ through ______________

<TABLE>
<S>                 <C>                 <C>                     <C>
--------------------------------------------------------------------------------
NUMBER OF
mBGA                NUMBER OF
PACKAGES            BILLABLE PINS       ROYALTY RATE            ROYALTY (US$)

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
</TABLE>

TOTAL ROYALTY REMITTED:    US$
                              ------------------------

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                                       18
<PAGE>   20

                                    EXHIBIT 4

              TERMS AND CONDITIONS OF TOSHIBA'S PERSONNEL DISPATCH

1.      Period of Technical Assistance

        Period of Technical Assistance shall commence on the day of Toshiba's
        personnel's arrival in U.S.A. from Japan and end on the day of his
        departure to Japan from the U.S.A.

2.      Hours of Work

2.1     Working hours of Toshiba's personnel shall be eight (8) hours a day,
        five (5) days a week.

2.2     In case Tessera requests Toshiba for overtime work, Toshiba may, with
        the consent of Toshiba's representative, comply with such request under
        the following conditions.

2.2.1   For overtime work or work on a holiday, Saturday, or Sunday, Tessera
        shall submit to Toshiba in advance a request.

2.2.2   Twenty five per cent (25%) of overtime charge shall be added for the
        overtime work and one hundred percent (100%) for the work done during
        night (between 10:00 PM and 6:00 AM) and work on a holiday, fifty
        percent (50%) for the work on Saturday and Sundays, after at least two
        days work during the previous week. The amount shall be remitted to
        Toshiba together with the reimbursement of Technical Assistance Fee
        provided for in Article 2.

3.      Reimbursement and Expenses

3.1     Reimbursement for Technical Assistance by Toshiba's personnel shall be
        made for the period from the date of arrival in the U.S.A. until the
        date of departure from the U.S.A. (including Saturdays, Sundays and
        Holidays) by Telegraphic Transfer Remittance to Toshiba's bank account.
        Such remittance shall be made in a lump sum within thirty (30) days
        following receipt of an invoice therefor from Toshiba.

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<PAGE>   21
3.2     Tessera shall provide, or, where applicable reimburse the cost of the
        following facilities to Toshiba's personnel assigned to work in the
        U.S.A. pursuant to Article 2 for their travel, accommodation and local
        transport;

3.2.1   Round trip full-fare air ticket for economy class from the normal place
        of assignment of such personnel to the U.S.A.

3.2.2   Travel by air or air-conditioned economy class train or other means of
        transportation to the place of work and back on arrival in the U.S.A.
        and while traveling in the U.S.A., on work assignment, cost of travel by
        air-conditioned first class train or by air or by other means of
        transportation.

3.2.3   While at the Tessera's facilities, single room or equivalent hotel
        accommodation. During stay on place other than Tessera's facilities,
        suitable hotel accommodation shall be provided.

3.2.4   Transportation facilities to and from the place of residence to work.

3.2.5   Furnished office accommodation, secretarial assistance and support, and
        expenses on facsimile, telegram, telex and telephone calls required for
        the work.

3.2.6   The first aid medical care shall be provided by Tessera to Toshiba's
        personnel in case of accident, injury and illness, but medical insurance
        shall be provided by Toshiba for it's personnel.

Toshiba/Tessera Confidential
                                       20

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