Document:

<PAGE>

                                                                    EXHIBIT 10.6

                                PROMISSORY NOTE

$125,000                                                   Palo Alto, California
                                                                November 7, 1995

     FOR VALUE RECEIVED, Synplicity, Inc., a California Corporation ("Debtor")
hereby promises to pay Andreas Bechtolsheim ("Lender"), the principal sum of One
Hundred and Twenty Five Thousand Dollars ($125,000) with simple interest on the
unpaid advanced principal from the date upon which it was advanced at the rate
of 6.11% per annum, provided that interest shall be compounded annually if it is
not paid as required hereby. All accrued interest shall be paid on December 31
of each year commencing December 31, 1995. Principal and any accrued interest
shall be due and payable on October 31, 2002. This loan may be prepaid at any
time without penalty, with interest payable for the amount of time the loan was
outstanding.

     The makers and endorsers have severally waived presentment for payment,
protest, notice of protest, and notice of non-payment of this Note.

     If one or more of the following events shall have occurred and be
continuing, that is to say:

     (a)  If Debtor (i) shall commence any proceeding or other action relating
to it in bankruptcy or seek reorganization, dissolution, liquidation, winding-
up, or any other relief under the Bankruptcy Code, as amended, or (ii) shall
make a general assignment for the benefit of creditors; or

     (b)  If any proceedings are commenced or any other action is taken against
Debtor in bankruptcy or seeking reorganization, liquidation, dissolution,
winding-up, or for any other relief under the Bankruptcy Code, as amended; and
any such event continues for ninety (90) days undismissed or undischarged; or

     (c)  If Debtor shall default in the performance of any of its obligations
under the Note, such default shall have continued unremedied for a period of
thirty (30) days and the obligation is not being contested in good faith by
appropriate legal proceedings;

then the holder of this Note may at any time at such holder's option by written
notice to Debtor declare the principal amount of and accrued interest on this
Note to be immediately payable, without presentment or protest, both of which
are hereby waived by Debtor.

     This Note and the obligations of the Debtor hereunder shall be governed by
and construed in accordance with California law, excluding its choice of law
rules. All reasonable expenses incurred by Lender in connection with the
collection of this Note, including reasonable attorneys' fees, shall be paid by
the Debtor, whether or not suit is filed.

     The obligations owning under this Note shall be subordinate in right of
payment to any and all current and future amounts to be owed by Debtor to any
commercial bank or loan institution.

Debtor:

/s/ Alisa Yaffa              Nov. 7, 1995
----------------------------
Synplicity, Inc.
Alisa Yaffa, Vice President

Lender:

/s/ Andreas Bechtolsheim
----------------------------
Andreas Bechtolsheim<PAGE>

                                                                    Exhibit 10.7

                               SYNPLICITY, INC.
                               ----------------
                AUTHORIZED INTERNATIONAL DISTRIBUTOR AGREEMENT
                ----------------------------------------------

     This Agreement is made between Synplicity, Inc., a California corporation
with its principal place of business at 465 Fairchild Drive, Suite 115, Mountain
View, California 94043, United States of America ("Company"), and Pacific
                                                   -------
Design, Inc., a Japanese corporation maintaining its principal place of business
at Satake Building 3F, 12-8 Motayoyogi-cho, Shibuya-ku, Tokyo 151, Japan
("Distributor").
  -----------

                                   RECITALS
                                   --------

     A.  Company develops, manufactures and distributes certain computer
software products, including the products listed in Exhibit A ("Company
                                                    ---------   -------
Products"). This Agreement pertains only to "Company Products" as listed in
--------
Exhibit A and not to any other products developed, manufactured or distributed
---------
by Company, except as otherwise provided herein.

     B.  Company and Distributor desire that Distributor be authorized to act as
an independent distributor of Company Products under the terms and conditions
set forth below.

NOW, THEREFORE, Company and Distributor agree as follows:

1.   Appointment as Authorized Company Distributor.
     ----------------------------------------------

     (a) Appointment. Subject to the terms of this Agreement, Company appoints
         -----------
Distributor, and Distributor accepts such appointment, as an independent, non-
exclusive distributor of Company Products in and limited to the territory set
forth in Exhibit B (the "Territory") solely and directly to end users for their
         ---------       ---------
own internal business purposes, during the term of this Agreement.

     (b) Limited Rights. Distributor's rights in Company Products will be
limited to those expressly granted in this Agreement. Company reserves all other
rights with respect to Company Products.

     (c) Subdistribution. Distributor may not appoint subdistributors to
         ---------------
distribute or provide service or support for Company Products without Company's
prior written approval.

     (d) Nature of Distribution. To the extent that any Company Product contains
         ----------------------
or consists of software, Distributor's appointment only grants to Distributor a
license to distribute such Company Product, and does not transfer any right,
title or interest to any such Company Product to Distributor or Distributor's
customers. Company will sell Company Products to Distributor only to the extent
that such Products consist of non-software items on the terms specified herein.
Use of the terms "sell," "license," "purchase," "license fees" and "price" will
be interpreted in accordance with this Section.

     (e) Marketing and Technical Material. At Distributor's request Synplicity
         --------------------------------
shall provide Distributor with marketing and technical information concerning
the Products as well as reasonable quantities of brochures, instructional
material, advertising literature and other Company Product data. Additional
quantities can be purchased at Company's cost. All such materials will be
printed in the English language.

2.   Obligations of Distributor
     --------------------------

     (a) Marketing and Support. Distributor will use its best efforts to
         ---------------------
aggressively advertise, promote, and distribute Company Products, including at
trade shows, at Distributor's expense, to end users. Distributor will provide
installation assistance, technical training for end-users and first level pre-
and post-sales support and maintenance services, which will include resolving
problems not caused primarily by Company Product's malfunction. Distributor will
satisfy reasonable criteria and policies with respect to Distributor's marketing
and support obligations under this Agreement communicated in writing to
Distributor by Company from time to time.

     (b) Initial Purchase. Distributor will purchase a minimum of twenty (20) of
         ----------------
the Company Product "Synplify" as its initial inventory within thirty (30) days
after the date of this Agreement. Thereafter, Distributor will maintain a
reasonable inventory of Company Products sufficient to respond to customer
requirements.

     (c) Training. Periodic training to maintain or increase technical
         --------
competence on Company Products may be provided from time to time by Company.
Distributor will send personnel to this periodic training, as reasonably
requested by Company, and bear all related travel and living expenses.

     (d) Company Packaging. Distributor will distribute Company Products with
         -----------------
all packaging, warranties and disclaimers and license agreements intact as
shipped from Company, unless otherwise instructed in writing by Company, and
will instruct its customers as to the terms of such documents applicable to
Company Products.

     (e) No Modification or Reverse Engineering. Distributor will not modify or
         --------------------------------------
enhance Company Products without

                                  Page 1 of 9
<PAGE>

Company's prior written consent. Company shall own all proprietary rights in any
such modifications or enhancements and Distributor transfers and assigns to
Company all proprietary rights, including copyright, patent, and wade secret
rights, to any such modifications or enhancements. In addition, Distributor
agrees not to reverse engineer or decompile Company Products or request others
to reverse engineer or decompile Company Products.

     (f) No Copying. Distributor will not copy or otherwise reproduce any
         ----------
Company Products, in whole or in part, except for making reasonable numbers of
back-up copies or as expressly authorized by this Agreement.

     (g) No Competing Products. Distributor will not represent or distribute
         ---------------------
during the term of this Agreement any products which in Company's opinion,
compete, directly or indirectly with Company Products. Distributor warrants that

Exhibit B lists all of the manufacturers and distributors ("Manufacturers and
---------                                                   -----------------
Distributors"), and their respective products, that Distributor represents or
------------
distributes as of the date of this Agreement and, if Distributor undertakes to
represent or distribute any additional manufacturers or distributors, or to
promote any additional products of the manufacturers and distributors listed in
Exhibit B, Distributor will so inform Company by written notice within thirty
---------
(30) days of such undertaking.

     (h) Distributor Covenants. Distributor will: (i) conduct business in a
         ---------------------
manner that reflects favorably at all times on Company Products and the good
name, good will and reputation of Company; (ii) avoid deceptive, misleading or
unethical practices that are or might be detrimental to Company, Company
Products or the public; (iii) make no false or misleading representations with
regard to Company or Company Products; (iv) not publish or employ, or cooperate
in the publication or employment of, any misleading or deceptive advertising
material with regard to Company or Company Products; (v) make no
representations, warranties or guarantees to customers or to the wade with
respect to the specifications, features or capabilities of Company Products that
are inconsistent with the literature distributed by Company; and (vi) not enter
into any contract or engage in any practice detrimental to the interests of
Company in Company Products.

     (i) Copies for In-House Use. Company will provide to Distributor a
         -----------------------
reasonable number of PC and UNIX licenses for Company Products for use by
Distributor's employees at Distributor's principal place of business as given on
page one of this Agreement. These licenses are intended for use by Distributor's
employees in supporting Distributors customers who have purchased Company
Products and for demonstrations at Distributor's principal place of business,
and are not salable by Distributor to its customers and cannot be used for any
purpose other than customer support and demonstrations. These licenses will
expire upon termination of this Agreement.

     (j) Demonstration Copies. Company will provide to Distributor a reasonable
         --------------------
number of PC security keys for Company Products for use during the term of this
Agreement. These security keys are intended for demonstration, training and
evaluation purposes only and are not salable by Distributor to its customers and
cannot be used for any purpose other than demonstration, training and
evaluation. Distributor agrees that for each evaluation of the Company Products,
the end user will fill out an evaluation receipt for the evaluation materials.
This evaluation receipt will include a simplified version of the Company
Evaluation Agreement, which has been localized for the language of the Territory
by Distributor as described in Section 2(n), and approved by the Company.
Distributor agrees to FAX or mail the evaluation receipts to Company within
thirty (30) days after their execution by the end user. Distributor must give
all end users evaluating Company Products a Quick Start Guide describing, among
other things, the use of Company Products. Distributor must maintain records of
the whereabouts of these demonstration security keys at all times, and provide
this information in its reports as described in Section 3(a). Distributor shall
have the right to order the standard Company Evaluation Kits, provided
Distributor shall pay Company's then current charges for any such Evaluation
Kits, and provided that the right to use such Evaluation Kits will be governed
by the terms of their respective end user license agreements, which will be
localized for the language of the Territory by Distributor as described in
Section 2(n), and approved by the Company. In no event will Distributor allow
any end user to use Company Products for more than four (4) months, in
aggregate, without purchasing a license for the Company Product.

     (k) Costs and Expenses. Except as expressly provided herein or agreed to in
         ------------------
writing by Company and Distributor, Distributor will pay all costs and expenses
incurred in the performance of Distributor's obligations under this Agreement.

     (l) Market Conditions. Distributor will advise Company promptly concerning
         -----------------
any market information that comes to Distributor's attention respecting Company,
Company Products, Company's market position or the continued competitiveness of
Company Products in the marketplace. Distributor will confer with Company from
time to time at the request of Company on matters relating to market conditions,
sales forecasting and product planning relating to Company Products.

     (m) Compliance with Law. Distributor will comply with all applicable
         -------------------
international, national, state, regional and local laws and regulations in
performing its duties hereunder and in any of its dealings with respect to
Company Products.

     (n) Localizations. Distributor will make such changes to Company Products,
         -------------
at Distributor's expense, as are required by the laws of the Territory or as
Company and Distributor agree in writing are appropriate to adapt Company
Products for use in

                                  page 2 of 9
<PAGE>

the Territory, including but not limited to translating Company Product
documentation into the language of the Territory (collectively,
"Localizations"), and shall package Company Products in accordance with
 -------------
Company's instructions. At a minimum, Distributor shall translate the Company
end user license and evaluation agreements into the language of the Territory.
Distributor will submit all Localizations to Company for Company's prior review
and approval. If Company notifies Distributor that any Localization is
inaccurate in any material respect, Distributor will correct such Localization
prior to further publishing or distributing it. Distributor hereby assigns to
Company all its right, title and interest in all such translated and modified
materials, including but not limited to all related copyrights and moral rights.

     (o) Compliance with U.S. Export Laws. Distributor acknowledges that all
         --------------------------------
Company Products including documentation and other technical data are subject to
export controls imposed by the U.S. Export Administration Act of 1979, as
amended (the "Act"), and the regulations promulgated thereunder. Distributor
will not export or reexport (directly or indirectly) any Company Products or
documentation or other technical data therefor without complying with the Act
and the regulations thereunder.

     (p) Governmental Approval. If any approval with respect to this Agreement,
         ---------------------
or the notification or registration thereof, will be required at any time during
the term of this Agreement, with respect to giving legal effect to this
Agreement in the Territory, or with respect to compliance with exchange
regulations or other requirements so as to assure the right of remittance abroad
of U.S. dollars pursuant to Section 5(e) hereof or otherwise, Distributor will
immediately take whatever steps may be necessary in this respect, and any
charges incurred in connection therewith will be for the account of Distributor.
Distributor will keep Company currently informed of its efforts in this
connection. Company will be under no obligation to ship Company Products to
Distributor hereunder until Distributor has provided Company with satisfactory
evidence that such approval, notification or registration is not required or
that it has been obtained.

3.   Inspections, Records and Reporting.
     ----------------------------------

     (a) Reports. Within ten (10) days of the end of each month, Distributor
         -------
will provide to Company (i) a "Marketing Report" that describes the
Distributor's activities of a marketing nature, such as direct mail,
advertising, trade shows, and technical articles during the previous month, and
plans for the next month, (ii) a "Customer Report" that identifies each customer
who submitted a purchase order during the previous month, (iii) an "Inventory
Report" that lists the current inventory levels of Company Products, (iv) a
"Sales Forecast" for the next six month period that lists the names and
addresses of prospective customers and the expected revenue from each, (v) an
"Evaluation Report" listing the end users names and companies that have an
Evaluation Kit for Company Products, an(vi) a "Trouble Report" identifying any
problems found during the previous month that are believed to be caused by
errors in Company Products.

     (b) Notification. Distributor will: (i) notify Company in writing of any
         ------------
claim or proceeding involving Company Products within ten (10) days after
Distributor learns of such claim or proceeding; and (ii) notify Company in
writing not more than thirty (30) days after any change in the management of
Distributor or any transfer of more than twenty-five percent (25%) of
Distributor's voting control or a transfer of substantially all its assets.

     (c) Records. Distributor will maintain, for at least two years after
         -------
termination of this Agreement, its records, contracts and accounts relating to
distribution of Company Products, and will permit examination thereof by
authorized representatives of Company at all reasonable times.

4.   Order Procedure.
     ----------------

     (a) Order Instructions and End User License Agreements. Distributor will
         --------------------------------------------------
FAX or mail a Distributor purchase order to Company giving the part numbers and
prices for the order in a form acceptable to Company. The Distributor purchase
order must include information about the customer, including name., address,
phone, fax, and email address, if applicable. Maintenance must be ordered for
the first year. Orders for Company Products may be refused if the information
supplied is incomplete, or. if there are terms that are inconsistent with this
Agreement. Distributor agrees to have each end user enter into the Company end
user license agreement that has been localized for the Territory, as described
in Section 2(n), and to mail a copy of such signed license  agreement to Company
within sixty (60) days.

     (b) Controlling Terms. The terms and conditions of this Agreement and of
         -----------------
the applicable Company invoice or confirmation will apply to each order accepted
or shipped by Company hereunder. The provisions of Distributor's form of
purchase order or other business forms will not apply to any order
notwithstanding Company's acknowledgment or acceptance of such order.

     (c) Cancellation. Company reserves the right to cancel any orders placed by
         ------------
Distributor and accepted by Company as set forth above, or to refuse or delay
shipment thereof, if Distributor (i) fails to make any payment as provided in
this Agreement or under the terms of payment set forth in any invoice or
otherwise agreed to by Company and Distributor, or (ii) otherwise fails to
comply with the terms and conditions of this Agreement. Company also reserves
the right to discontinue the manufacture or distribution of any or all Company
Products at any time, and to cancel any orders for such discontinued Company

                                  Page 3 of 9
<PAGE>

Products without liability of any kind to Distributor or to any other person. No
such cancellation, refusal or delay will be deemed a termination (unless Company
so advises Distributor) or breach of this Agreement by Company.

5.   Prices and Payment.
     ------------------

     (a) Prices to Distributor. During the term of this Agreement, Company shall
         ---------------------
inform Distributor as to current prices to Distributor for Company Products. The
initial prices for Company Products and maintenance services are set forth in
Exhibit A ("Initial Prices"). Company may change its prices to Distributor from
---------   --------------
time to time upon at least sixty (60) days prior written notice.

     (b) Price Increase. In the event Company increases the price to Distributor
         --------------
for any Company Product, the increase shall apply to: any order received by
Company after the effective date of the increase; and any order or portion
thereof to be shipped after the effective date of the increase regardless of the
date the order was received; provided, however, that any order or portion
thereof transmitted by Distributor prior to Company's announcement of the
increase and affected thereby, may be canceled without penalty by Distributor by
written notice to Company within ten (10) days of such announcement.

     (c) Price Decrease. In the event that Company decreases the price to
         --------------
Distributor for any Company Product, the decrease shall apply to all units of
such product in Distributor's inventory that are in an unopened condition as of
the effective date of the decrease, and that had been shipped to Distributor no
more than sixty (60) days prior to such effective date. For each unit of product
as to which this section applies, Distributor will receive a credit against the
price of a subsequent unit purchased from Company within ninety (90) days of the
effective date of the price decrease.

     (d) Taxes, Tariffs, Fees. Company's prices do not include any national,
         --------------------
state or local sales, use, value added or other taxes, customs duties, or
similar tariffs and fees which Company may be required to pay or collect upon
the delivery of Company Products or upon collection of the prices or otherwise.
Should any tax or levy be made, Distributor agrees to pay such tax or levy and
indemnify Company for any claim for such tax or levy demanded. Distributor
represents and warrants to Company that all Company Products acquired hereunder
are for redistribution in the ordinary course of Distributor's business, and
Distributor agrees to provide Company with appropriate resale certificate
numbers and other documentation satisfactory to the applicable taxing
authorities to substantiate any claim of exemption from any such taxes or fees.
Distributor will pay any withholding taxes required by applicable law.
Distributor will supply Company with evidence of such payment of withholding
tax, in a form acceptable to Company to meet the requirements for claiming
foreign tax credits on Company's federal income tax return.

     (e) Payment Terms. Company will FAX or mail an invoice to Distributor for
         -------------
products shipped. All payments shall be made in United States dollars within
sixty (60) days of the date of invoice (net 60), free of any currency control or
other restrictions to Company at the address designated by Company. Distributor
will pay by wire transfer to a bank account designated by Company the amount of
the aggregate prices of Company Products ordered (plus any applicable taxes,
shipping and other charges).

     (f) Interest. Interest shall accrue on any delinquent amounts owed by
         --------
Distributor for Company Products at the lesser often percent (10%) per annum or
the maximum rate permitted by applicable usury law.

     (g) No Setoff. Distributor will not setoff or offset against Company's
         ---------
invoices amounts that Distributor claims are due to it. Distributor will bring
any claims or causes of action it may have in a separate action and waives any
right it may have to offset, setoff or withhold payment for Company Products
delivered by Company.

6.   Shipment, Risk of Loss and Delivery.
     -----------------------------------

     (a) Shipment. All Company Products will be shipped to Distributor's
         --------
identified warehouse facilities or freight forwarder, subject to approval in
writing by Company in advance of shipment. Unless specified in Distributor's
order, Company will select the mode of shipment and the carrier. Distributor
will be responsible for and pay all shipping and freight charges, which charges
Company may require Distributor to pay in advance.

     (b) Title and Risk of Loss. Title, except to the extent Company Products
         ----------------------
contain or consist of software, and risk of loss or damage to Company Products
will pass to Distributor upon delivery of Company Products to the carrier,
freight forwarder or Distributor, whichever fast occurs.

     (c) Partial Delivery. Unless Distributor clearly advises Company to the
         ----------------
contrary in writing, Company may make partial shipments on account of
Distributor's orders, to be separately invoiced and paid for when due. Delay in
delivery of my installment shall not relieve Distributor of its obligation to
accept the remaining deliveries.

     (d) Delivery Schedule; Delays. Company will use reasonable efforts to meet
         -------------------------
Distributor's requested delivery schedules for Company Products, but Company
reserves the right to refuse, cancel or delay shipment to Distributor when
Distributor is delinquent in payments or fails to meet other credit requirements
established by Company, or when Distributor has failed to perform its
obligations under this Agreement. Should orders for Company Products exceed
Company's available inventory, Company will allocate its available inventory and
make deliveries on a basis Company deems equitable, in its sole

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<PAGE>

discretion, and without liability to Distributor on account of the method of
allocation chosen or its implementation. In any event, Company will not be
liable for any damages, direct, consequential, special or otherwise, to
Distributor or to any other person for failure to deliver or for any delay or
error in delivery of Company Products for any reason whatsoever.

7.   Distributor Determines Its Own Prices.
     -------------------------------------

     Although Company may publish suggested wholesale or retail prices, these
are suggestions only and Distributor will be entirely free to determine the
actual prices at which Company Products will be sold or licensed to its
customers.

8.   Trademarks, Trade Names, Logos, Designations and Copyrights.
     -----------------------------------------------------------

     (a) Use During Agreement. During the term of this Agreement, Distributor is
         --------------------
authorized by Company to use the trademarks, trade names, logos and designations
Company uses for Company Products in connection with Distributor's
advertisement, promotion and distribution of Company Products. Distributor's use
of such trademarks, trade names, logos and designations will be in accordance
with Company's policies in effect from time to time, including but not limited
to trademark usage and cooperative advertising policies. Distributor agrees not
to attach any additional trademarks, trade names, logos or designations to any
Company Product. Distributor further agrees not to use any Company trademark,
trade name, logo or designation in connection with any non-Company Product. The
current Company trademarks are: (i) Synplicity; (ii) Synplify; (iii) Simply
better synthesis; (iv) The fast synthesis company; and (v) the Synplicity `S',
`Y', `N', blocks logo.

     (b) Copyright and Trademark Notices. Distributor will include on each
         -------------------------------
Company Product that it distributes, and on all containers and storage media
therefor, all trademark, copyright and other notices of proprietary rights
included by Company on such Company Product. Distributor agrees not to alter,
erase, deface or overprint any such notice on anything provided by Company.
Distributor also will include the appropriate trademark notices when referring
to any Company Product in advertising and promotional materials.

     (c) Approval of Representation. All representations of Company's Trademarks
         --------------------------
that Distributor intends to use shall first be submitted to Company for approval
(which shall not be unreasonably withheld) of design, color, and other details
or shall be exact copies of those used by Company. If any of Company's
Trademarks are to be used in conjunction with another trademark on or in
relation to Company Products, then Company's mark shall be presented equally
legibly, equally prominently and of equal to or greater size than the other but
nevertheless separated from the other so that each appears to be a mark in its
own right, distinct from the other mark.

     (d) Distributor Does Not Acquire Proprietary Rights. Distributor has paid
         -----------------------------------------------
no consideration for the use of Company's trademarks, trade names, logos,
designations or copyrights, and nothing contained in this Agreement will give
Distributor any right, title or interest in any of them. Distributor
acknowledges that Company owns and retains all trademarks, trade names, logos,
designations, copyrights and other proprietary rights in or associated with
Company Products, and agrees that it will not at any time during or after this
Agreement assert or claim any interest in or do anything that may adversely
affect the validity of any trademark, trade name, logo, designation or copyright
belonging to or licensed to Company (including, without limitation any act or
assistance to any act, which may infringe or lead to the infringement of any of
Company's proprietary rights).

     (e) No Continuing Rights. Upon termination of this Agreement, Distributor
         --------------------
will immediately cease all display, advertising and use of all Company
trademarks, trade names, logos and designations and will not thereafter use,
advertise or display any trademark, trade name, logo or designation which is, or
any part of which is, similar to or confusing with any trademark, trade name,
logo or designation associated with any Company Product.

     (f) Obligation to Protect. Distributor agrees to use reasonable efforts to
         ---------------------
protect Company's proprietary rights and to cooperate at Distributor's expense
in Company's efforts to protect its proprietary rights. Distributor agrees to
promptly notify Company of any known or suspected breach of Company's
proprietary rights that comes to Distributor's attention.

9.   Assignment.
     ----------

     Company has entered into this Agreement with Distributor because of
Distributor's commitments in this Agreement, and further because of Company's
confidence in Distributor, which confidence is personal in nature. This
Agreement will not be assignable by either party, and Distributor may not
delegate its duties hereunder without the prior written consent of Company;
provided, however, that Company may assign this Agreement to a subsidiary or
entity controlling, controlled by or under common control with Company. The
provisions hereof shall be binding upon and inure to the benefit of the parties,
their successors and permitted assigns.

10.  Duration and Termination of Agreement.
     -------------------------------------

     (a) Term. This Agreement will commence on the date hereof and will expire
         ----
twelve months from the Effective Date of this Agreement. However, this Agreement
will be automatically renewed for successive twelve (12) month terms, unless
either party notifies the other party in writing, at least sixty (60) days
before the end of the then current term, of its election not to

                                  Page 5 of 9
<PAGE>

renew. Notwithstanding the provisions of this Section l O(a), or any other
provisions of this Agreement this Agreement may be terminated as set forth
below:

     (b) Company Termination For Cause. Company may terminate this Agreement at
         -----------------------------
any time in the event that:

         (i)    Distributor defaults in any payment due to Company and such
default continues unremedied for a period often (10) days following written
notice of such default;

         (ii)   Distributor fails to perform any other obligation, warranty,
duty or responsibility or is in default with respect to any term or condition
undertaken by Distributor under this Agreement and such failure or default
continues unremedied for a period of twenty (20) days following written notice
of such failure or default;

         (iii)  Distributor is merged, consolidated, sells all or substantially
all of its assets, or implements or suffers any substantial change in management
or control; or

         (iv)   Any bill or regulation granting Distributor extracontractual
compensation upon termination of this Agreement is introduced into or passed by
the legislature or other governing body of the Territory.

     (c) Termination At Will. Distributor or Company may terminate this
         -------------------
Agreement at will, at any time during the term of this Agreement, with or
without cause, by written notice given to the other party not less than ninety
(90) days prior to the effective date of such termination.

     (d) Automatic Termination. This Agreement terminates automatically, with no
         ---------------------
further act or action of either party, if a receiver is appointed for
Distributor or its property, Distributor makes an assignment for the benefit of
its creditors, any proceedings are commenced by, for or against Distributor
under any bankruptcy, insolvency, composition or debtor's relief law, or
Distributor is liquidated or dissolved.

     (e) Orders After Termination Notice. In the event that any notice of
         -------------------------------
termination of this Agreement is given, Company will be entitled to reject all
or part of any orders received from Distributor after notice but prior to the
effective date of termination if availability of Company Products is
insufficient at that time to meet the needs of Company and its customers fully.
Any Company Products shipped thereafter shall be paid for by certified or
cashier's check prior to shipment.

     (f) Effect of Termination. Upon termination of this Agreement:
         ---------------------

         (i)    Within ten (10) days of termination of this Agreement,
Distributor will provide Company a Preliminary Termination Report, in writing,
that includes the status of negotiations with prospective customers and the
services Distributor is obligated to provide to existing customer.

         (ii)   Within forty five (45) days of termination of this Agreement,
Distributor will provide Company final termination reports as set forth in
Section 3(a) above.

         (iii)  In no event will Distributor license, sell or otherwise
transfer Company Products to any third party upon termination. All existing
customers shall revert back to Company for continued support and future sales of
Company Products. Within twenty (20) days of termination of this Agreement,
Distributor agrees to return to Company or destroy, as directed by Company, all
Company Products, including all computer media containing Company's computer
programs and printed material related to Company Products.

         (iv)   The due dates of all outstanding invoices to Distributor for
Company Products automatically will be accelerated so they become due and
payable on the effective date of termination, even if longer terms had been
provided previously. All orders or portions thereof remaining unshipped as of
the effective date of termination shall automatically be canceled.

         (v)    For a period of two (2) years after the date of termination,
Distributor shall make available to Company for inspection and copying all books
and records of Distributor that pertain to Distributor's performance of and
compliance with its obligations, warranties and representations under this
Agreement.

         (vi)   Distributor shall cease using any Company trademark, trade name,
logo or designation.

     (g) No Damages For Termination. NEITHER COMPANY NOR DISTRIBUTOR SHALL BE
         --------------------------
LIABLE TO THE OTHER FOR DAMAGES OF ANY KIND, INCLUDING INCIDENTAL OR
CONSEQUENTIAL DAMAGES, ON ACCOUNT OF THE TERMINATION OF THIS AGREEMENT IN
ACCORDANCE WITH THIS SECTION 10. DISTRIBUTOR WAIVES ANY RIGHT IT MAY HAVE TO
RECEIVE ANY COMPENSATION OR REPARATIONS ON TERMINATION OF THIS AGREEMENT UNDER
THE LAW OF THE TERRITORY OR OTHERWISE, OTHER THAN AS EXPRESSLY PROVIDED IN THIS
AGREEMENT. Neither Company nor Distributor will be liable to the other on
account of termination of this Agreement for reimbursement or damages for the
loss of goodwill, prospective profits or anticipated income, or on account of
any expenditures, investments, leases or commitments made by either Company or
Distributor or for any other reason whatsoever based upon or growing out of such
termination. Distributor acknowledges that (i) Distributor has no expectation
and has received no assurances that any investment by Distributor in the
promotion of Company Products will be recovered or recouped or that Distributor
will obtain any anticipated amount of profits by virtue of this Agreement, and
(ii) Distributor will not have or acquire by virtue of this

                                  Page 6 of 9
<PAGE>

Agreement or otherwise MY vested, proprietary or other right in the promotion of
Company Products or in "goodwill" created by its efforts hereunder. THE PARTIES
ACKNOWLEDGE THAT Tills SECTION HAS BEEN INCLUDED AS A MATERIAL INDUCEMENT FOR
COMPANY TO ENTER INTO THIS AGREEMENT AND THAT COMPANY WOULD NOT HAVE ENTERED
INTO THIS AGREEMENT BUT FOR THE LIMITATIONS OF LIABILITY AS SET FORTH HEREIN.

     (h) Survival. Company's rights and Distributor's obligations to pay Company
         --------
all amounts due hereunder, as well as Distributor's obligations under Sections
3(b), 3(e), 5(d), 5(e), 5(0, 8, 12, 13, 14, 15, 16, 17(c), 17(d), 17(11), 17(h),
17(i) and 170) shall survive termination of this Agreement.

11.  Relationship of the Parties.
     ----------------------------

     Distributor's relationship with Company during the term of this Agreement
will be that of an independent contractor. Distributor will not have, and will
not represent that it has, any power, right or authority to bind Company, or to
assume or create any obligation or responsibility, express or implied, on behalf
of Company or in Company's name, except as herein expressly provided.

12.  Indemnification.
     ----------------

     (a) Indemnification of Distributor. Company will, at its expense, defend
         ------------------------------
Distributor against and, subject to the limitations set forth herein, pay all
costs and damages made in settlement, or awarded against Distributor resulting
from any claim based on an allegation that a Company Product as supplied by
Company hereunder infringes a U.S. patent or copyright of a third party,
provided that Distributor (i) gives Company prompt written notice of any such
claim, (it) allows Company to direct the defense and settlement of the claims,
and (iii) provides Company with the information and assistance necessary for the
defense and settlement of the claim. Ira final injunction is obtained in an
action based on any such claim against Distributor's use of a Company Product by
reason of such infringement, or if in Company's opinion such an injunction is
likely to be obtained, Company may, at its sole option, either (i) obtain for
Distributor the right to continue using the company Product, (i~ replace or
modify the Company Product so that it becomes noninfringing, or (iii) if neither
(i) nor (it) can be reasonably effected by Company, credit to Distributor the
prices paid for the company Product during the twelve (12) months prior to the
credit, provided that such Company Products are returned to Company in an
undamaged condition.

     (b) No Combination Claims. Notwithstanding subpart (a) of this Section 12,
         ---------------------
Company shall not be liable to Distributor for any claim arising from or based
upon the combination, operation or use of any Company Product with equipment,
data or programming not supplied by Co, any, or arising from any alteration or
modification of company Products.

     (c) Limitation. THE PROVISIONS OF THIS SECTION SET FORTH THE ENTIRE
         ----------
LIABILITY OF COMPANY AND THE SOLE REMEDIES OF DISTRIBUTOR WITH RESPECT TO
INFRINGEMENT AND ALLEGATIONS OF INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
OTHER PROPRIETARY RIGHTS OF ANY KIND IN CONNECTION WITH THE INSTALLATION,
OPERATION, DESIGN, DISTRIBUTION OR USE OF COMPANY PRODUCTS.

     (d) Indemnification of Company. Distributor agrees to indemnify Company
         --------------------------
(including paying all reasonable attorneys' fees and costs of litigation)
against and hold Company harmless from, any and all claims by any other party
resulting from Distributor's acts (other than the mere marketing of Company
Products), omissions or misrepresentations, regardless of the form of action.

13.  Limited Warranty; Disclaimer of Warranties.
     -------------------------------------------

     (a) Limited Warranty. COMPANY MAKES NO WARRANTIES OR REPRESENTATIONS AS TO
         ----------------
PERFORMANCE OF COMPANY PRODUCTS OR AS TO SERVICE TO DISTRIBUTOR OR TO ANY OTHER
PERSON, EXCEPT AS SET FORTH IN COMPANY'S LIMITED WARRANTY ACCOMPANYING DELIVERY
OF COMPANY PRODUCTS. COMPANY RESERVES THE RIGHT TO CHANGE THE WARRANTY AND
SERVICE POLICY SET FORTH IN SUCH LIMITED WARRANTY, OR OTHERWISE, AT ANY TIME,
WITHOUT FURTHER NOTICE AND WITHOUT LIABILITY TO DISTRIBUTOR OR TO ANY OTHER
PERSON.

     (b) Disclaimer of Warranties. TO THE EXTENT PERMITTED BY APPLICABLE LAW,
         ------------------------
ALL IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT, ARE
HEREBY EXCLUDED BY COMPANY.

     (c) Distributor Warranty. Distributor will make no warranty, guarantee or
         --------------------
representation, whether written or oral, on Company's behalf.

14.  Limited Liability.
     ------------------

     (a) REGARDLESS WHETHER ANY REMEDY SET FORTH HEREIN OR IN COMPANY'S LIMITED
WARRANTY ACCOMPANYING DELIVERY OF COMPANY PRODUCTS FAILS OF ITS ESSENTIAL
PURPOSE OR

                                  Page 7 of 9
<PAGE>

OTHERWISE, COMPANY WILL NOT BE LIABLE FOR ANY LOST PROFITS OR FOR ANY DIRECT,
INDIRECT, INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR OTHER SPECIAL DAMAGES SUFFERED
BY DISTRIBUTOR, ITS CUSTOMERS OR OTHERS ARISING OUT OF OR RELATED TO THIS
AGREEMENT OR COMPANY PRODUCTS, FOR ALL CAUSES OF ACTION OF ANY KIND (INCLUDING
TORT, CONTRACT, NEGLIGENCE, STRICT LIABILITY AND BREACH OF WARRANTY) EVEN IF
COMPANY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

     (b) EXCEPT FOR LIABILITY FOR PERSONAL INJURY OR PROPERTY DAMAGE ARISING
FROM COMPANY'S GROSS NEGLIGENCE OR WILLFUL MISCONDUCT, IN NO EVENT WILL
COMPANY'S TOTAL CUMULATIVE LIABILITY IN CONNECTION WITH THIS AGREEMENT OR
COMPANY PRODUCTS, FROM ALL CAUSES OF ACTION OF ANY KIND, INCLUDING TORT,
CONTRACT, NEGLIGENCE, STRICT LIABILITY AND BREACH OF WARRANTY, EXCEED $50,000,
No arbitration, action or other proceeding under this Agreement, unless
involving death or personal injury, may be brought by either party against the
other more than two (2) years afar the cause of action arises,

     (c) Distributor agrees that the limitations of liability and disclaimers of
warranty set forth in this Agreement will apply regardless of whether Company
has tendered delivery of Company Products or Distributor has accepted any
Company Product Distributor acknowledges that Company has set its prices and
entered into this Agreement in reliance on the disclaimers of liability, the
disclaimers of warranty and the limitations of liability set forth in this
Agreement and that the same form an essential basis of the bargain between the
parties.

15.  Confidentiality.
     ---------------

     Distributor acknowledges that in the course of performing its obligations
hereunder it will receive information which is confidential and proprietary to
Company. Distributor agrees not to use such information except in performance of
this Agreement and not to disclose such information to third parties.

16.  Arbitration.
     -----------

     (a) Subject to Section 17(g), any dispute arising out of or related to this
Agreement shall be finally settled in accordance with the Rules of Conciliation
and Arbitration of the International Chamber of Commerce. The arbitration shall
take place in Santa Clara County, California, but the parties hereby agree to
exclude any right of application or appeal to the courts in connection with any
question of law arising in the course of the reference or out of the award. Each
of the parties shall appoint one (1) arbitrator and the two (2) so nominated
shall, in turn, choose a third arbitrator. If the arbitrators chosen by the
parties cannot agree on the choice of the third arbitrator within a period of
thirty (30) days after their nomination, then the third arbitrator shall be
appointed by the President of the International Chamber of Commerce.

     (b) The arbitration shall be conducted in the English language. Relevant
documents in other languages shall be translated into English if the arbitrators
so direct. The law of the State of California, U.S.A., excluding the Convention
on Contracts for the International Sale of Goods and that body of law known as
conflicts of laws, shall be the applicable substantive law. The applicable
procedural law shall be the law of the place of arbitration. The parties agree
that they will, before the hearing of any dispute, make discovery and disclosure
of all materials relevant to the subject matter of such dispute.

     (c) A written transcript in English of the hearing will be made and
furnished to the parties. Examination of witnesses by the parties and by the
arbitrators will be permitted.

     (d) The arbitrators will decide in accordance with the terms of this
Agreement and will take into account any appropriate international trade usages
applicable to the transaction. The arbitrators will state the reasons upon which
the award is based.

     (e) The award of the arbitrators will be final and binding upon the
parties. Judgment upon the award may be entered in any court having
jurisdiction. An application may be made to any such court for judicial
acceptance of the award and an order of enforcement.

17.  General.
     -------

     (a) Waiver. The waiver by either party of any default by the other shall
         ------
not waive subsequent defaults of the same or different kind.

     (b) Notices. All notices and demands hereunder will be in writing and will
         -------
be served by personal service, mail or confirmed facsimile transmission at the
address of the receiving party set forth in this Agreement (or at such different
address as may be designated by such party by written notice to the other
party). All notices or demands by mail shall be by certified or registered
airmail, return receipt requested, and shall be deemed complete upon receipt.

     (c) Attorneys' Fees, In the event any litigation is brought by either party
         ---------------
in connection with this Agreement, the

                                  Page 8 of 9
<PAGE>

prevailing party in such litigation shall be entitled to recover from the other
party all the costs, attorneys' fees and other expenses incurred by such
prevailing party in the litigation.

     (d) Execution of Agreement, Controlling Law, Jurisdiction and Severability.
         ----------------------------------------------------------------------
This Agreement will become effective only after it has been signed by
Distributor and has been accepted by Company its principal place of business,
and its effective date shall be the date on which it is signed by Company. It
shall be governed by and construed in accordance with the laws of the State of
California, excluding the Convention on Contracts for the International Sale of
Goods and that body of law known as conflicts of laws. Any suit hereunder will
be brought in the federal or state courts in the Northern District of California
and Distributor hereby submits to the personal jurisdiction thereof. The
English-language version of this Agreement controls when interpreting this
Agreement. Distributor consents to the enforcement of any judgment rendered in
the United States in any action between Distributor and Company. Any and all
defenses concerning the validity and enforceability of the judgment shall be
deemed waived unless first raised in a court of competent jurisdiction in the
United States.

     (e) Severability. In the event that any of the provisions of this Agreement
         ------------
shall be held by a court or other tribunal of competent jurisdiction to be
unenforceable, such provision will be enforced to the maximum extent permissible
and the remaining portions of this Agreement shall remain in full force and
effect.

     (f) Force Majeure. Company shall not be responsible for any failure to
         -------------
perform due to unforeseen circumstances or to causes beyond Company's reasonable
control, including but not limited to acts of God, war, Hot, embargoes, acts of
civil or military authorities, fire, floods, accidents, strikes, failure to
obtain export licenses or shortages of transportation, facilities, fuel, energy,
labor or materials. In the event of any such delay, Company may defer the
delivery date of orders for Company Products for a period equal to the time of
such delay.

     (g) Equitable Relief. Distributor acknowledges that any breach of its
         ----------------
obligations under this Agreement with respect to the proprietary rights or
confidential information of Company will cause Company irreparable injury for
which there are inadequate remedies at law, and therefore Company will be
entitled to equitable relief in addition to all other remedies provided by this
Agreement or available at law.

     (h) Entire Agreement. This Agreement constitutes the complete and exclusive
         ----------------
agreement between the parties pertaining to the subject matter hereof, and
supersedes in their entirety any and all written or oral agreements previously
existing between the parties with respect to such subject matter. Distributor
acknowledges that it is not entering into this Agreement on the basis of any
representations not expressly contained herein. Any modifications of this
Agreement must be in writing and signed by both parties hereto. Any such
modification shall be binding upon Company only if and when signed by one of its
duly authorized officers.

     (i) Release of Claims. Any and all claims against Company arising under
         -----------------
prior agreements, whether oral or in writing, between Company and Distributor
are waived and released by Distributor by acceptance of this Agreement.

     (j) Choice of Language. The original of this Agreement has been written in
         ------------------
English. Distributor waives any right it may have under the law of Distributor's
Territory to have this Agreement written in the language of Distributor's
Territory.

     (k) Due Execution. The party executing this Agreement represents and
         -------------
warrants that he or she has been duly authorized under Distributor's charter
documents and applicable law to execute this Agreement on behalf of Distributor.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement
effective on the date specified below.

COMPANY:        Synplicity, Inc.         DISTRIBUTOR:   Pacific Design, Inc.

Signature:       /s/ Alisa Yaffa         Signature:     /s/ Yoshio Nyukai
                 ----------------------                 --------------------

Printed Name:    Alisa Yaffa             Printed Name:  Yoshio Nyukai
                 ----------------------                 --------------------

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

Date:            February 13, 1996       Date:          Feb. 13, 1996
                 ----------------------                 --------------------
                 (This is the Effective
                  Date of this Agreement)

                                  Page 9 of 9
<PAGE>

                                   EXHIBIT A
                                   ---------

                               COMPANY PRODUCTS
                               ----------------

Synplify
Synplify-Lite
Upgrade License from Synplify-Lite to Synplify
Extra Synplify User's Guides

All products run on PCs (Windows 3.1, -95, -NT), SUNs (Sun OS4), and HPs.

                                INITIAL PRICES
                                --------------
                              ALL $ IN US DOLLARS

Synplify

                                Platform and License Type
<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------------------------------
       Product           PC (Windows 3.1, 95, or NT)       Sun * or HP * (node-locked)         Sun * or HP * (floating)
---------------------------------------------------------------------------------------------------------------------------
<S>                      <C>                               <C>                                 <C>
Synplify                      $[***]                           $[***]                            $[***]
---------------------------------------------------------------------------------------------------------------------------
        Maintenance                  $[***]                            $[***]                            $[***]
---------------------------------------------------------------------------------------------------------------------------

<CAPTION>
Synplify-Lite

                                Platform and License Type
------------------------------------------------------------------------------------------------------------------------------

       Product            PC (Windows 3.1, 95, or NT)      Sun * or HP * (node-locked)         Sun * or HP * (floating)
---------------------------------------------------------------------------------------------------------------------------
<S>                       <C>                              <C>                                 <C>
Synplify                      $[***]                           $[***]                            $[***]
---------------------------------------------------------------------------------------------------------------------------
        Maintenance                  $  [***]                          $[***]                            $[***]
---------------------------------------------------------------------------------------------------------------------------

<CAPTION>
Upgrade From Synplify-Lite to Synplify

                                Platform and License Type
----------------------------------------------------------------------------------------------------------------------------
       Product          PC (Windows 3.1, 95, or NT)      Sun * or HP * (node-locked)       Sun * or HP * (floating)
---------------------------------------------------------------------------------------------------------------------------
<S>                     <C>                              <C>                               <C>
Upgrade from Synplify         $[***]                           $[***]                            $[***]
Lite to Synplify
---------------------------------------------------------------------------------------------------------------------------
        Maintenance                  $  [***]                          $[***]                            $[***]
---------------------------------------------------------------------------------------------------------------------------
</TABLE>
* - Note: All Sun and HP licenses are one user per day licenses.

Extra Synplify User's Guides

$[***]

[***] 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.

<PAGE>

                                   EXHIBIT B
                                   ---------

                                   TERRITORY
                                   ---------

Japan

                        MANUFACTURERS AND DISTRIBUTORS
                        ------------------------------
<TABLE>
<CAPTION>

    Manufacturers and Distributors      Products           Type of Product
<S>                               <C>                       <C>

Frontline                         PureSpeed                 Verilog Simulator
                                  (Overdrive, Cycledrive,
                                  Developer, etc.)

Fugitsu                           Opting + Block Planner    ASIC Synthesis
                                  Option
</TABLE>
<PAGE>

                                  Addendum 1
                                  ----------
                                      to
                                      --

                                SYNPLICITY INC.
                                ---------------

            AUTHORIZED INTERNATIONAL EXCLUSIVE DISTRIBUTOR AGREEMENT
            --------------------------------------------------------

Subdistributor Agreement. Distributor may distribute, and may grant sublicenses
------------------------
of, Products to Subdistributors for distribution and sublicensing of Products to
End Users, provided that each such Subdistributor executes, or has already
executed, a written Subdistributor agreement with Distributor that:

(i)    protects Company's proprietary rights in the Products to at least the
       same degree as the terms and conditions of this Agreement;

(ii)   requires that such Subdistributor not reverse engineer, reverse compile
       or disassemble the object code for the Products;

(iii)  requires such Subdistributor to comply fully with all applicable laws and
       regulations in any of its dealings with respect to the Products;

(iv)   makes no representations or warranties on behalf of Company;

(v)    does not permit distribution or sublicensing of the Products beyond the
       scope of this Agreement;

(vi)   requires such Subdistributor to provide End User information to Company
       such as;

(vii)  technical end user name, company name and address, phone, fax and email
       (if applicable), security key serial number, or hostid and hostname; and

(viii) requires such Subdistributor to distribute the Products with the
       packaging intact, including an end user software license agreement with
       its End User that is consistent with the terms and conditions of this
       Agreement.

Distributor will promptly provide Company with a copy of each such executed
Subdistributor Agreement.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement
effective on the date specified below.

COMPANY: Synplicity, Inc.               DISTRIBUTOR: Pacific Design, Inc.
        -------------------------                   --------------------------

Signature: /s/ Alisa Yaffa              Signature: /s/ Yoshio Nyulaai
          -----------------------                 ----------------------------

Printed Name: Alisa Yaffa               Printed Name: Yoshio Nyulaai
             --------------------                    -------------------------

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

Date: July 10, 1996                     Date: July 15, 1996
     ----------------------------            ---------------------------------
<PAGE>

                                  ADDENDUM 2
                                  ----------

                                      TO
                                      --

                                SYNPLICITY INC.
                                ---------------
                AUTHORIZED INTERNATIONAL DISTRIBUTOR AGREEMENT
                ----------------------------------------------
                            DATED FEBRUARY 13, 1996
                            -----------------------

     This Addendum No. 2 to Synplicity, Inc. Authorized International
Distributor Agreement (this "Addendum No. 2") to the Synplicity, Inc. Authorized
International Distributor Agreement between the parties effective 13 February,
1996, as amended by Addendum No. 1, effective 10 July 1996 ("the Agreement") is
made and entered into this 9th day of February, 1998 (the "Addendum No. 2
Effective Date") by and between Synplicity, Inc., a California corporation with
its principal place of business at 624 East Evelyn Avenue, Sunnyvale, CA 94086
("Company") and Pacific Design Inc., a Japanese corporation maintaining its
principal place of business at Park West 5F, 6-12-1 Nishishinjuku, Shinjuku-ku
Tokyo 151, Japan ("Distributor").

[Canceled by mutual agreement of the parties]

<PAGE>

 .  Replace Section 10(a), "Term", in its entirety with the following:

          (a) Term. This Agreement will commence on the date hereof and will
              ----
     expire December 31, 2000. However, this Agreement will be automatically
     renewed for successive twelve (12)month terms, unless either party notifies
     the other party in writing, at least sixty (60) days before the end of the
     then current term, of its election not to renew. If there is a merger of
     the Company with or into another corporation, or the sale of substantially
     all of the assets or outstanding shares of the Company before December 31,
     2000, then this Agreement will terminate on the earlier of December 31,
     2000, or one year after the effective date of such a merger, asset or share
     sale, unless the surviving entity and Distributor agree in writing on an
     extension to the term. Notwithstanding the provisions of this Section
     10(a), or any other provisions of this Agreement, this Agreement may be
     terminated as set forth below.

 .  Section 10(c), "Termination At Will", is deleted.

Except as otherwise provided in this Addendum No. 2, all terms and conditions of
the Agreement remain in full force and effect.

The parties hereto have executed this Addendum with an effective date of
February 9, 1998:

COMPANY:         Synplicity, Inc.     DISTRIBUTOR:   Pacific Design, Inc.
                 ------------------                  --------------------

Signature:       /s/ Bernard Aronson  Signature:     /s/ Yoshio Nyukai
                 -------------------                 --------------------

Printed Name:    Bernard Aronson      Printed Name:  Yoshio Nyukai
                 ------------------                  --------------------

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

Date:            2/10/98              Date:          2/13/98
                 ------------------                  --------------------
<PAGE>

                                  ADDENDUM 3
                                      TO
        SYNPLICITY, INC. AUTHORIZED INTERNATIONAL DISTRIBUTOR AGREEMENT
               BETWEEN SYNPLICITY, INC. AND PACIFIC DESIGN, INC.

         This Addendum No. 3 to Synplicity, Inc. Authorized International
Distributor Agreement dated February 13, 1996, is made by and between
Synplicity, Inc., a California corporation, having its principal place of
business at 610 Caribbean Drive, Sunnyvale, California 94089 and Pacific Design,
Inc., having its principal place of business at Park West 5F, 6-12-1 Nishi-
Shinjuku, Shinjuku-ku, Tokyo 160, Japan.

 .    Exhibit A, Company Products and Initial Prices, shall be deleted in its
     entirety and replaced with the following:

                                   EXHIBIT A
                          PDI PRODUCT AND PRICE LIST
                           Effective October 1, 1999

<TABLE>
<CAPTION>
Part Number           Description                                                                           Japan
                                                                                                          Distributor
                                                                                                             Cost

Certify
<S>                   <C>                                                                          <C>    <C>
SCPN                  Certify PC, Node-Locked                                                               $ [***]
MCPN                  Annual Maintenance for Certify PC, Node-Locked                                        $ [***]
SCWN                  Certify Workstation, Node-Locked                                                      $ [***]
MCWN                  Annual Maintenance for Certify Workstation, Node-Locked                               $ [***]
SCWF                  Certify Floating, Workstation                                                         $ [***]
MCWF                  Annual Maintenance for Certify Floating, Workstation                                  $ [***]
SCPF                  Certify Floating, PC                                                                  $ [***]
MCPF                  Annual Maintenance for Certify Floating, PC                                           $ [***]

Synplify & HDL                                                                                      Oct.
Analyst                                                                                            1, 1999
SSPN                  Synplify, PC Node-Locked                                                              $ [***]
MSPN                  Annual Maintenance, Synplify, PC Node-Locked                                          $ [***]
SSPN-XX               Synplify, PC Node-Locked, Vendor XX Only                                              $ [***]
MSPN-XX               Annual Maintenance, Synplify, PC Node-Locked, Vendor XX Only                          $ [***]
SSWN                  Synplify, Workstation Node-Locked, All Vendors                                        $ [***]
MSWN                  Annual Maintenance for Synplify, Workstation Locked, All Vendors                      $ [***]
SSAF                  Synplify, Floating                                                           $ [***]  $ [***]
MSAF                  Annual Maintenance, Synplify, Floating                                       $ [***]  $ [***]
SHPN                  HDL Analyst, PC Node-Locked                                                  $ [***]  $ [***]
MHPN                  Annual Maintenance, HDL Analyst, PC Node-Locked                              $ [***]  $ [***]
SHAF                  HDL Analyst, Floating (floats with Synplify)                                 $ [***]  $ [***]
MHAF                  Annual Maintenance, HDL Analyst, Floating (floats with Synplify)             $ [***]  $ [***]

XX:  AC=Actel, AL=Altera, AT=Atmel, CY=Cypress, DY=Dynachip, LA=Lattice, LU=Lucent, PI=Philips, QL=Quicklogic, XI=Xilinx

Synplify & HDL Analyst, Upgrade Packages (Does NOT Apply to OEM Vendor Licenses)
SUPN                  Upgrade from single-vendor PC-locked Synplify to support all FPGA vendors             $ [***]
                      (PC-Locked license)
                      (maintenance will be pro-rated, use MSPN code for new annual maintenance)
XSAF                  Synplify (All-vendors) upgrade to floating from PC Node-Locked               $ [***]  $ [***]
                      (maintenance will be pro-rated, use MSAF code for new annual maintenance)
XHAF                  HDL Analyst, Upgrade to Floating from PC Node-Locked                         $ [***]  $ [***]
                      (maintenance will be pro-rated, use MHAF code for new annual maintenance)
</TABLE>

   Upgrade products apply only for licenses purchased within the past 12 months

[***] 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.

<PAGE>

   OEM versions of Synplify (Actel, Lattice & QuickLogic) receive no credit
   towards upgrades.[***]

  Miscellaneous

  SYNUG                 Additional Synplify User's Guide                 $[***]
  RHST                  Re-host fee                                      $[***]
-------------------------------------------------------------------------------

Except as amended herewith, all other paragraphs of the Synplicity, Inc.
International Distributor Agreement shall continue in full force and effect. In
the event of any conflict between the International Distributor Agreement and
this Addendum 3, the provisions of this Addendum 3 shall prevail.

The parties hereto have executed this Addendum with an effective date of
September 13, 1999.

SYNPLICITY, INC.                           PACIFIC DESIGN, INC.

_____________________________________      ___________________________________
Signature                                  Signature

      Douglas S. Miller
_____________________________________      ____________________________________
Printed Name                               Printed Name

      Vice President Finance, CFO
_____________________________________      ____________________________________
Title                                      Title

_____________________________________      ____________________________________
Date                                       Date

[***] 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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