Document:

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                                                                  EXHIBIT 10.8

                         CORPORATION AGREEMENT BETWEEN
                       CENTILLIUM TECHNOLOGY CORPORATION
                                      AND
                          Askey Computer Corporation

               This Corporation Agreement (this "Agreement") is effective as of
November 30th, 1997 (the "Effective Date") by and between Centillium Technology
Corporation, a California corporation, having its principal place of business at
46824 Lakeview Blvd, Fremont, Ca. 94538, Untied States of America
("Centillium"), and Askey Computer Corporation., a Taiwan corporation having its
principal place of business at 2F, No. 2, Lane 497, Chung-Cheng Rd., Hsin-Tien,
Taipei, 23136 Taiwan, R.O.C. ("ASKEY").

                                - WITNESSETH -

        WHEREAS, Centillium has expertise in the area of telecommunications
integrated circuits, including those which utilize multilevel modulation
techniques to enable high speed communications over copper, also known as
Digital Subscriber Line (xDSL) Technology; and

        WHEREAS, ASKEY has expertise in the area of CPE modems and associated
technologies; and

        WHEREAS, the parties hereto believe that each will derive benefits from
a business relationship in which they will work cooperatively to define an
integrated circuit solution for the copper interface portion of transmission
systems (the "Interface Devices"); and

       WHEREAS, Centillium will be in a position to provide ASKEY with early
models, system support, and loop environment engineering support in exchange for
ASKEY's commitment to use Centillium as it's preferred vendor of the Interface
Devices for as long as Centillium maintains competitive pricing; and

       WHEREAS, the parties hereto wish to set forth in this Agreement the
guidelines of their cooperation.

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

1.  Overall Objective of Cooperation
       (a) The objective of this cooperation is for both companies to work
together in developing the proper "Interface Device" technologies and systems
that can significantly develop the broadband telecommunications market. The
first phase of this activity includes product definition and joint marketing to
telco customers.

       (b) Each of the parties hereto will act in a commercially reasonable
fashion to provide the resources necessary to accomplish the objectives set
forth in this Agreement.
<PAGE>

Each of the parties hereto acknowledge and agrees that there are substantial
technical, financial and commercial risks associated with a development activity
of this type and therefore, that neither of the parties hereto can guarantee
that any of the development activities described in this Agreement or any
subsequent activities to be described in any future agreements will be completed
successfully.

     (c)  Both parties agree that the future phases of this agreement may
include the product development phase, and production phase. Both parties will
work together to develop a detail agreement covering the relationship agreement
between the two companies for future phases.

2. Scope of Cooperation
The parties cooperation will be conducted in phases:
     (a)  Phase 1: Product Definition Phase

           (i)  The parties hereto jointly approve specifications for an
                integrated circuit solution for the Interface Devices.
           (ii) The parties hereto will co-market the resultant solution to the
                end customers (e.g., telcos).

     (b)  Phase 2:  Prototyping Phase

           (i)  ASKEY will evaluate Centillium's first prototype of the
                Interface Devices. Centillium will provide evaluation boards to
                the ASKEY for this evaluation. ASKEY will provide a written
                report on the evaluation. ASKEY agrees to provide additional
                evaluation reports throughout the period of this Agreement as
                subsequent iterations of the Interface Devices are prototyped
                and forwarded to ASKEY for evaluation. Prototypes of second
                and/or future iterations of the Interface Devices will be
                provided free of charge unless they are custom iterations for
                ASKEY in which case Centillium may charge a fee to be mutually
                agreed upon by the parties hereto.

     (c)  Phase 3: Pre-Production and Production Phase

           (i)  ASKEY will supply written acknowledgment that the Interface
                Devices meet all the specifications listed in the Product
                Specification agreed to by the parties. Upon acceptance of the
                Interface Devices and upon acceptance of Centillium's pricing,
                ASKEY will provide Centillium with a requirements forecast of
                its delivery requirements covering the next twelve month period
                for the Interface Devices to be purchased from Centillium.
           (ii) ASKEY will also assist Centillium in establishing standards
                utilizing its modulation schemes and will support Centillium's
                documentation efforts for the Interface Devices. If Centillium
                produces devices based upon such standards, Centillium will
                provide ASKEY with access to

<PAGE>

          such devices (e.g., alpha and beta test site) prior to the general
          commercial release of such devices.

               (iii) ASKEY and Centillium agree that reasonable standard
          commercial terms and conditions will apply to the sale of all devices
          to ASKEY.

3.   Technology Ownership and Licenses

          (a)  Nothing herein will be constructed as an express or implied
license (under patents or otherwise) of any kind.

          (b)  Centillium will have exclusive right to design and market Devices
and any improvements or modifications thereto resulting from the activities of
this Agreement.

          (c)  Any information disclosed by ASKEY to Centillium under this
Agreement with respect to direct support of the Devices (i.e., with respect to
characterization and performance of the Devices) may be freely used by
Centillium for the purpose of implementation of design and implementation of
manufacturing and supporting Devices sold to Centillium's customers, and other
substantially similar activities; the restrictions with regard to Confidential
Information set forth in Section 4 hereof will not apply to the specific
information set forth above but will apply to all other ASKEY information.

4.   Confidential Information and Non-Disclosure

          Any technical information and other business information disclosed
hereunder by either party hereto to the other will be held in strict confidence
by the receiving party from the date of disclosure until three years after the
date this agreement expires or terminates, using the same degree of care as the
receiving party uses for its own information of a similar kind, and will not be
transferred or divulged to any third-party or any employee who does not have the
requisite need to know. For purposes of interpreting this Agreement, employees
of ASKEY's affiliates, divisions or subsidiaries do not have the requisite need
to know to obtain access to Centillium confidential information disclosed to
ASKEY hereunder. Such confidentiality obligation will not apply to portions of
such technical information and other business information, if any, (a) which
were previously known to the other party hereto free of any confidentiality
obligation, (b) which are or become known to the public, provided that such
public knowledge is not attributable to a breach of this Agreement by the other
party hereto; (c) which the furnishing party explicitly agrees in writing need
not be kept confidential (either in this Agreement or separately), or (d) which
are received by the other party hereto rightfully from a third-party without a
restriction on disclosure. Further, Centillium agrees not to disclose to any
other party any of the specifics of ASKEY's system testing and results that
might specifically indicate a problem related to such system. However, if the
Devices are modified by Centillium to remedy a system problem, Centillium may
disclose such test information as may be necessary to support such modified
Devices, to the extent that such disclosure coincidences with the availability
of the Modified Devices.

<PAGE>

5. Term

     This Agreement will expire Four (4) years after the Effective Date unless
extended in writing by mutual parties.

6. Governing Law

     The construction, interpretation and performance of this Agreement will be
governed by the laws of the State of California without reference to its
conflict of laws and principals. The United Nations Convention on Contracts for
the International Sale of Goods will not apply to the sale of Devices hereunder.

7. Entire Agreement

     This Agreement sets forth the entire agreement and understanding between
the parties hereto with respect to its subject matter. It mergers all
discussions between them and voids and replaces each and every other agreement
or understanding which may heretofore have existed between Centillium and ASKEY
regarding such subject matter. Notwithstanding the foregoing, the Nondisclosure
Agreement between the parties hereto, dated xxxx, as amended, will be permitted
to use any information disclosed thereunder to the extent permitted in this
Agreement.

8. Publicity

     (a)  Neither party hereto will disclose the existence or content of this
Agreement without the other's prior written consent, which will not be
unreasonably withheld. Each party will submit to the other all proposed
publicity material relating to the disclosure of this Agreement or the
relationship of the parties hereto.

     (b)  This Section 8 will not prohibit disclosure by a party if such
disclosure is required by a court of competent jurisdiction, law or regulation.

     IN WITNESS WHEREOF, each of Centillium Technology Corporation and Advances
Fiber Communications Inc. have executed this Agreement, in duplicate originals,
by their respective officers hereunto duly authorize, the day and year first
above written.

Centillium Technology Corporation         Askey Computer Corporation
---------------------------------         --------------------------

By:     /s/ Faraj Aalaei                  By:     /s/ Robert Lin
        -----------------------------             -----------------------------

Name:   Faraj Aalaei                      Name:   Robert Lin
        -----------------------------             -----------------------------

Title:  V.P. Marketing                    Title:  General Manager
        -----------------------------             -----------------------------<PAGE>

                                                                  EXHIBIT 10.9

                         COOPERATION AGREEMENT BETWEEN
                       CENTILLIUM TECHNOLOGY CORPORATION
                                      AND
                         SUMITOMO ELECTRIC INDUSTRIES

     This Cooperation Agreement (this "Agreement") is effective as of October
15, 1997 (the "Effective Date") by and between Centillium Technology
Corporation, a California corporation, having its principal place of business at
46824 Lakeview Blvd, Fremont, Ca. 94538, United States of America
("Centillium"), and Sumitomo Electric Industries, Ltd., a Japanese Corporation
with its principal offices at 5-33 Kitahama 4-chome, Chuo-ku, Osaka, Japan
("Sumitomo").

                                - WITNESSETH -

     WHEREAS, Centillium has expertise in the area of telecommunications
integrated circuits, including those which utilize multilevel modulation
techniques to enable high speed communications over copper, also known as
Digital Subscriber Line (xDSL) Technology; and

     WHEREAS, Sumitomo has expertise in the area of telecommunications systems
and associated technologies; and

     WHEREAS, the parties hereto believe that each will derive benefit from a
business relationship in which they will work cooperatively to define an
integrated circuit solution for the copper interface portion of transmission
systems (the "Interface Devices"), The Interface Devices shall consist of
Digital Signal Processor ("DSP") and software, and are capable of addressing the
main markets for xDSL which includes the Internet access market, single pair
HDSL and FITL short reach DSL. The basic specification of the Interface Devices
shall be described in the Attachment A to be provided by Centillium; and

     WHEREAS, Centillium will be in a position to provide Sumitomo with early
models, system support, and loop environment engineering support in exchange for
Sumitomo's commitment to use Centillium as its preferred vendor of the Interface
Devices for as long as Centillium maintains competitive terms and conditions;
and

     WHEREAS, the parties hereto wish to set forth in this Agreement the
guidelines of their cooperation.

     NOW, THEREFORE, in consideration of the covenants herein contained, the
parties hereto agree as follows:

1. Overall Objective of Cooperation

     (a)  The objective of this cooperation is for both companies to work
together in developing the proper "Interface Device" technologies and systems
that can significantly develop the broadband telecommunications market. The
first phase of this activity includes product definition and joint marketing to
telco customers.
<PAGE>

     (b)  Each of the parties hereto will act in a commercially reasonable
fashion to provide the resources necessary to accomplish the objectives set
forth in this Agreement. Each of the parties hereto acknowledge and agrees that
there are substantial technical, financial and commercial risks associated with
a development activity of this type and, therefore, that neither of the parties
hereto can guarantee that any of the development activities described in this
Agreement or any subsequent activities to be described in any future agreements
will be completed successfully.

     (c)  Both parties agree that the future phases of this agreement may
include the product development phase, and production phase. Both parties will
work together to develop a detail agreement covering the relationship agreement
between the two companies for future phases.

2. Scope of Cooperation

The parties' cooperation will be conducted in phases:

     (a)  Phase 1: Product Definition Phase

          (i)   The parties hereto will jointly approve specifications for an
                integrated circuit solution for the Interface Devices.

          (ii)  The parties hereto will co-market the resultant solution to the
                end customers (e.g., telcos).

     (b)  Phase 2: Prototyping Phase (Target Date: July 1998)

          (i)   Sumitomo will evaluate Centillium's first prototype of the
                Interface Devices. Centillium will provide, without additional
                payment, except those stipulated in Article 3, reasonable
                quantities of evaluation boards to the Sumitomo for this
                evaluation. Sumitomo will provide a written report on the
                evaluation. Sumitomo agrees to provide additional evaluation
                reports throughout the period of this Agreement as subsequent
                iterations of the Interface Devices are prototyped and forwarded
                to Sumitomo for evaluation. Prototypes of second and/or future
                iterations of the Interface Devices will be provided free of
                charge unless they are custom iterations for Sumitomo in which
                case Centillium may charge a fee to be mutually agreed upon by
                the parties hereto.

          (ii)  Upon request made by Sumitomo simultaneously with the evaluation
                reports stated above. Centillium shall incorporate into software
                portion of the Interface Devices the modules created by Sumitomo
                for Japanese market specifications. Sumitomo may dispatch
                reasonable numbers of its engineers to Centillium's facilities
                in order to create such modules by using the development
                environment of Centillium.

          (iii) In order to cover the NRE costs incurred by Centillium in
                regards to the abovementioned activities for Japanese Market
                specifications.
<PAGE>

                Centillium and Sumitomo shall mutually agree on payments in
                addition to the $250,000 as described in Article 2 below by
                Sumitomo to Centillium. This shall be done simultaneously with
                definition of the scope of the work for these activities by
                Centillium.

          (iv)  As the result of the co-development activities stated in item
                (b)(ii) and b(iii), technology, software and other intellectual
                property of Sumitomo may be incorporated in the Interface
                Devices. In such a case, Centillium and Sumitomo shall agree on
                a reasonable discount schedule offered to Sumitomo, which
                applies only to Interface Devices sold to Sumitomo. Centillium
                shall have a royalty free exclusive license to this Sumitomo's
                technology for manufacturing, using and selling the Interface
                Devices to all Centillium's other customers. Such license will
                be terminated upon the occurrence of the event described in item
                6 in the Agreement. Both parties acknowledge that Sumitomo has
                been conducting certain activities with Analog Devices
                Corporation as to ADSL, ANSI T1.413, DMT implementation (the
                "ADSL project").

                Sumitomo hereby confirms to Centillium that Sumitomo is not
                cooperating with Analog Devices with respect to any other
                projects than the "ADSL Project". Sumitomo also confirms that it
                will not cooperate with any other entity on any other project
                involving Sumitomo's DSL technology that may result in products
                similar to the Interface Devices as set forth in the beginning
                of this Agreement, software and other intellectual property of
                Sumitomo (the "Sumitomo IP") related to the co-development
                activities in item (b)(ii) and (b)(iii) hereof. In furtherance
                of, and not in limitation to, Section 5 hereof any other
                agreement between Sumitomo and Centillium. Sumitomo will not
                disclose any of Centillium's confidential information to Analog
                Devices. Further, Sumitomo will not disclose any Sumitomo IP to
                Analog Devices other than such Sumitomo IP necessary for the
                ADSL Project. [As used herein, the ADSL Project shall not mean
                any modification, derivation or extension thereof not currently
                contemplated.

     (c)  Phase 3: Pre-production and Production Phase (Target Date: September
     1998)

          (i)   Sumitomo will supply written acknowledgment that the Interface
                Devices meet all the specifications listed in the Product
                Specification agreed to by the parties. Upon the execution of
                the supply agreement between Centillium and Sumitomo stipulated
                in Section 6, Sumitomo will provide Centillium with a
                requirements forecast of its delivery requirements covering the
                next twelve month period for the Interface Devices to be
                purchased from Centillium.

          (ii)  Sumitomo will also assist Centillium in establishing standards
                utilizing Centillium's modulation schemes and will support
                Centillium's
<PAGE>

                documentation efforts for the Interface Devices. If Centillium
                produces devices based upon such standards, Centillium will
                provide Sumitomo with access to such devices (e.g., alpha and
                beta test site) prior to the general commercial release of such
                devices.

          (iii) Sumitomo and Centillium agree that reasonable standard
                commercial terms and conditions will apply to the sale of all
                devices to Sumitomo.

3. Payments

     (a)  Following the execution of this Agreement Sumitomo will pay Centillium
          a non-recurring engineering (NRE) charge of $250,000 to offset costs
          associated with Centillium's development of the Interface Devices.
          Development of the evaluation boards for the Central Office (CO) and
          customer premise Modem. Application support as well as limited special
          loop plant modeling that may be requested by Sumitomo. The $250,000
          payment shall be made according to the following schedule:

          (i)   $150,000 upon the signing of the Agreement
          (ii)  $100,000 upon acceptance by Sumitomo of the prototype devices
                and the evaluation board for the CO and the customer premise
                modem-not to exceed ninety (90) days after the delivery of the
                abovementioned by Centillium. Acceptance by Sumitomo shall not
                be unreasonably withheld. If Centillium receives no rejection
                within ninety (90) days, the Interfaces Devices shall be deemed
                accepted and the payment shall be immediately due.

     (b)  This $250,000 is not part of the additional payments specified in
     2(b)(iii) above.

4. Technology Ownership and Licenses

     (a)  Nothing herein will be constructed as an express or implied license
(under patents or otherwise) of any kind.

     (b)  Centillium will have exclusive right to design and market Devices and
any improvements of modifications thereto resulting from the activities of this
Agreement.

     (c)  Any information disclosed by Sumitomo to Centillium under this
Agreement with respect to direct support of the Devices (i.e., with respect to
                                                         ---
characterization and performance of the Devices) may be freely used by
Centillium for the purpose of implementation of design and implementation of
manufacturing and supporting Devices sold to Centillium's customers, and other
substantially similar activities Notwithstanding the confidential obligations in
section 5 hereof.  Centillium may, with Sumitomo's prior consent, disclose the
specific information set forth above.  Such consent shall not be un-reasonably
withheld.
<PAGE>

5. Confidential Information and Non-Disclosure

     Any technical information and other business information disclosed
hereunder by either party hereto to the other will be held in strict confidence
by the receiving party from the date of disclosure until three years after the
date this agreement expires or terminates, using the same degree of care as the
receiving party uses for its own information of a similar kind, and will not be
transferred or divulged to any third-party or any employee who does not have the
requisite need to know. For purposes of interpreting this Agreement, employees
of Sumitomo's affiliates, divisions or subsidiaries do not have the requisite
need to know to obtain access to Centillium confidential information disclosed
to Sumitomo hereunder.  Such confidentiality obligation will not apply to
portions of such technical information and other business information, if any,
(a) which were previously known to the other party hereto free of any
confidentiality obligation, (b) which are or become known to the public,
provided that such public knowledge is not attributable to a breach of this
Agreement by the other party hereto, (c) which the furnishing party explicitly
agrees in writing need not be kept confidential (either in this Agreement or
separately), or (d) which are received by the other party hereto rightfully from
a third-party without a restriction on disclosure.  Further, Centillium agrees
not to disclose to any other party any of the specifics of Sumitomo's system
testing and results that might specifically indicate a problem related to such
system.  However, if the Devices, are modified by Centillium to remedy a system
problem, Centillium may disclose such test information as may be necessary to
support such modified Devices, to the extent that such disclosure coincides with
the availability of the Modified Devices.

6. Supply Agreement of Interface Devices

     Centillium and Sumitomo agree to execute the supply agreement of Interface
Devices purchased by SEI from Centillium simultaneously with written
acknowledgement of Sumitomo that the Interface Devices meet all the
specifications listed in the product specification agreed to by both parties.
Such Supply Agreement shall include the following statement.

          (i)  Centillium may elect at any time during the term of this
               Agreement, to discontinue the manufacture of the Interface
               Devices, provided that Centillium shall continue to supply to
               Sumitomo upgrade version of the Interface Devices, if any upgrade
               exist. If Centillium makes the election described in the
               foregoing sentence, it shall provide Sumitomo twelve (12) months
               prior written notice and the opportunity to make a life time
               supply purchase. Sumitomo may place orders for an amount of
               Interface Devices not to exceed three (3) times the pre-notice
               production rate at any time during such twelve (12) months for
               delivery up to eighteen (18) months after receipt of notice. The
               supply of any upgrade version shall be subject to the terms of a
               new Supply Agreement reasonably acceptable to both parties.
          (ii) Centillium shall place into escrow both of the source code and
               object
<PAGE>

               code of the software utilized for Interface Devices, and all the
               necessary data to manufacture the Interface Devices ("Escrowed
               Items"). If Centillium ceases the manufacture of the Interface
               Devices and Centillium is unable to provide Sumitomo with the
               purchase right similar to the one stated in (6)(1), for the
               reason of voluntary or involuntary bankruptcy. Escrowed items
               shall be disclosed to Sumitomo. In such a case, Centillium shall
               grant to Sumitomo a royalty free, non-exclusive license of the
               relevant know-how and patents owned by Centillium for the purpose
               of production of the Interface Devices.

7.  Term

     This Agreement will expire Four (4) years after the Effective Date unless
extended in writing by mutual parties.

8.  Governing Law

     The construction, interpretation and performance of this Agreement will be
governed by the laws of the State of California without reference to its
conflict of laws and principals. The United Nations Convention on Contracts for
the International Sale of Goods will not apply to the sale of Devices hereunder.

9.  Entire Agreement

     This Agreement sets forth the entire agreement and understanding between
the parties hereto with respect to its subject matter.  It merges all
discussions between them and voids and replaces each and every other agreement
or understanding which may heretofore have existed between Centillium and
Sumitomo regarding such subject matter.  Notwithstanding the foregoing, the
Nondisclosure Agreement between the parties hereto, dated August 27, 1997, as
amended, will be deemed incorporated herein by reference, provided that each
party hereto will be permitted to use any information disclosed thereunder to
the extent permitted in this Agreement.

10. Publicity

     (a) Neither party hereto will disclose the existence or content of this
Agreement without the other's prior written consent, which will not be
unreasonably withheld. Each party will submit to the other all proposed
publicity material relating to the disclosure of this Agreement or the
relationship of the parties hereto.

     (b) This Section 9 will not prohibit disclosure by a party if such
disclosure is required by a court of competent jurisdiction, law or regulation.

     IN WITNESS WHEREOF, each of Centillium Technology Corporation, and Sumitomo
Electric Industries Ltd. have executed this Agreement, in duplicate originals,
by their respective officers hereunto duly authorize, the day and year first
above written.
<PAGE>

CENTILLIUM TECHNOLOGY CORP.             Sumitomo Electric Industries, Ltd.
--------------------------              ----------------------------------

Faraj Aalaei:                                 Hideo Takahashi
-------------                                 ---------------
VP Planning and Business Development   General Manager, Systems and Electronics
------------------------------------   ----------------------------------------
                                       R&D
                                       ---

/s/ Faraj Aalaei                       /s/ Hideo Takahashi
----------------------------           ---------------------------

        10/13/97                             10/24/97

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