Document:

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                                                                     Exhibit 4.2

               AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

     This Amended and Restated Registration Rights Agreement is made as of March
31, 2000 by and among Synplicity, Inc., a California corporation having its
principal executive offices at 935 Stewart Drive, Sunnyvale, California 94086
(the "Company"), the persons listed on Exhibit A (the "Existing Shareholders")
and the purchasers of the Company's Series C Preferred Stock (the "Purchasers").

     WHEREAS, the Company and the Existing Shareholders are parties to an
Amended and Restated Registration Rights Agreement dated March 9, 1999 (the
"Former Agreement").

     WHEREAS, the parties to the Former Agreement desire to amend and restate
the agreement to read as set forth below and to include the Purchasers as set
forth on Exhibit B hereto.

     WHEREAS, the Company and the Purchasers are entering into a Series C
Preferred Stock Purchase Agreement of even date herewith (the "Purchase
Agreement"), pursuant to which the Company shall sell, and the Purchasers shall
acquire, shares of the Company's Series C Preferred Stock.

     WHEREAS, in order to induce the Company to enter into the Purchase
Agreement and to induce the Purchasers to invest funds in the Company, the
parties desire that the Purchasers be granted registration rights and rights of
participation with respect to the Preferred Shares.

     NOW, THEREFORE, in consideration of the mutual promises and covenants
hereinafter set forth, the parties agree as follows:

                                  SECTION 1.

     1.1  Termination of Former Agreement.  Through their execution of this
          -------------------------------
Agreement, the Company and the Existing Shareholders agree to terminate the
Former Agreement and restate the terms thereof through this Agreement, with the
result that this Agreement shall constitute the sole agreement among the parties
hereto with respect to the registration of Registrable Securities.

     1.2  Certain Definitions. As used in this Agreement, the following terms
          -------------------
shall have the following respective meanings:

          "Commission" shall mean the Securities and Exchange Commission or any
           ----------
other federal agency at the time administering the Securities Act.

          "Conversion Stock" shall mean the Common Stock issued or issuable
           ----------------
pursuant to conversion of the Preferred Shares.

          "Holders" shall mean (i) any person who purchased the Company's
           -------
Preferred Shares or any person holding Registrable Securities to whom the rights
under this Section 1 have been transferred in accordance with Section 1.12
hereof and (ii) Alisa Yaffa and Kenneth McElvain as
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common shareholders (the "Founders").

          "Initiating Holders" shall mean the Holders or transferees of the
           ------------------
Holders under Section 1.12 hereof  who, in the aggregate, are Holders of at
least 51% of the Preferred Shares or at least 51% of the shares held by the
Founders.

          "Preferred Shares" shall mean the Series A Preferred Stock, Series B
           ----------------
Preferred Stock and Series C Preferred Stock of the Company.

          "Registrable Securities" means (i) the Conversion Stock, (ii) the
           ----------------------
Common Stock held by Alisa Yaffa and Kenneth McElvain on the date hereof (the
"Founders' Common Stock") and (iii) any Common Stock of the Company issued or
issuable in respect of the Conversion Stock or other securities issued or
issuable pursuant to the conversion of the Preferred Shares or upon any stock
split, stock dividend, recapitalization or similar event, or any Common Stock
otherwise issued or issuable with respect to the Founders' Common Stock or the
Preferred Shares, provided, however, that shares of Common Stock or other
securities shall no longer be treated as Registrable Securities if (A) they have
been sold to or through a broker or dealer or underwriter in a public
distribution or a public securities transaction, (B) they have been sold in a
transaction exempt from the registration and prospectus delivery requirements of
the Securities Act so that all transfer restrictions and restrictive legends
with respect thereto are removed upon consummation of such sale, (C) in the case
of a Holder who then holds less than one percent (1%) of the then outstanding
Common Stock (determined on the basis of assumed conversion of all securities
convertible into Common Stock), the shares are available for sale, in the
opinion of counsel to the Company, without compliance with the registration and
prospectus delivery requirements of the Securities Act so that all transfer
restrictions and restrictive legends with respect thereto may be removed upon
the consummation of such sale, or (D) they may be sold under Rule 144 (excluding
144A) of the Securities Act (as defined below) within a three month period.

          The terms "register," "registered" and "registration" refer to a
                     --------    ----------       ------------
registration effected by preparing and filing a registration statement in
compliance with the Securities Act, and the declaration or ordering of the
effectiveness of such registration statement.

          "Registration Expenses" shall mean all expenses incurred by the
           ---------------------
Company in complying with Sections 1.3, 1.4 and 1.5 hereof, including, without
limitation, all registration, qualification and filing fees, printing expenses,
escrow fees, fees and disbursements of counsel for the Company and the
reasonable cost of one special legal counsel to represent all of the Holders
together in any such registration shall be borne by the Company, blue sky fees
and expenses, normal audit expenses (but not including the expense of any
special audits incident to or required by any such registration where the
Company is not registering any of its securities, excluding the compensation of
regular employees of the Company which shall be paid in any event by the
Company).

          "Restricted Securities" shall mean the securities of the Company
           ---------------------
required to bear the legend set forth in Section 8.2 of the Purchase Agreement.

          "Securities Act" shall mean the Securities Act of 1933, as amended, or
           --------------
any similar

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federal statute and the rules and regulations of the Commission thereunder, all
as the same shall be in effect at the time.

          "Selling Expenses" shall mean all underwriting discounts, selling
           ----------------
commissions and stock transfer taxes applicable to the securities registered by
the Holders.

     1.3  Requested Registration.
          ----------------------
          (a)  Request for Registration.  In case the Company shall receive from
               ------------------------
Initiating Holders a written request that the Company effect any registration,
qualification or compliance with respect to not less than 20% of the shares of
Registrable Securities then held by such Initiating Holders (or any lesser
percentage if the reasonably anticipated aggregate price to the public of such
shares, net of underwriting discounts and commissions, would exceed $2,000,000),
the Company will:

               (i)  Promptly give written notice of the proposed registration,
qualification or compliance to all other Holders and

               (ii) as soon as practicable, but in any case within ninety (90)
days, use its best efforts to file a registration statement covering the
Registrable Securities to effect such registration, qualification or compliance
(including, without limitation, appropriate qualification under applicable blue
sky or other state securities laws and appropriate compliance with applicable
regulations issued under the Securities Act and any other governmental
requirements or regulations) as may be so requested and as would permit or
facilitate the sale and distribution of all or such portion of such Registrable
Securities as are specified in such request, together with all or such portion
of the Registrable Securities of any Holder or Holders joining in such request
as are specified in a written request received by the Company within 20 days
after receipt of such written notice from the Company.

     Provided, however, that the Company shall not be obligated to take any
action to effect any such registration, qualification or compliance pursuant to
this Section 1.3:

                    (A)  Prior to the earlier of February 19, 2002 or within six
months after the effective date of the Company's initial or other registration
statement relating to an underwritten public offering of the Company's
securities filed under the Securities Act;

                    (B)  After the Company has effected two such registrations
pursuant to this subparagraph 1.3(a), and such registrations have been declared
or ordered effective; or

                    (C)  If the Company shall furnish to such Holders a
certificate signed by the President of the Company stating that in the good
faith judgment of the Board of Directors it would be seriously detrimental to
the Company or its shareholders for a registration statement to be filed at such
time, then the Company's obligation to use its best efforts to register, qualify
or comply under this Section 1.3 shall be deferred for a period not to exceed
180 days from the date of receipt of written request from the Initiating
Holders; provided, however, that the Company shall not exercise such right more
than once in any twelve month period.

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     Subject to the foregoing clauses (A) through (C), the Company shall file a
registration statement covering the Registrable Securities so requested to be
registered as soon as practicable but in any case within ninety (90) days after
receipt of the request or requests of the Initiating Holders.

          (b)  Underwriting.  If the Initiating Holders intend to distribute the
               ------------
Registrable Securities covered by their request by means of an underwriting,
they shall so advise the Company as part of their request made pursuant to
Section 1.3 hereof and the Company shall include such information in the written
notice referred to in Section 1.3(a)(i) above. In such event, the right of any
Holder to registration pursuant to Section 1.3 shall be conditioned upon such
Holder's participation in the underwriting arrangements required by this Section
1.3, and the inclusion of such Holder's Registrable Securities in the
underwriting to the extent requested shall be limited to the extent provided
herein.

     The Company shall (together with all Holders proposing to distribute their
securities through such underwriting) enter into an underwriting agreement in
customary form with the managing underwriter selected for such underwriting by a
majority in interest of the Initiating Holders, but subject to the Company's
reasonable approval. Notwithstanding any other provision of this Section 1.3, if
the managing underwriter advises the Initiating Holders in writing that
marketing factors require a limitation of the number of shares to be
underwritten, the managing underwriter may limit the Registrable Securities to
be included in such offering. The Company shall so advise all Holders of
Registrable Securities and the number of shares of Registrable Securities that
may be included in the registration and underwriting shall be allocated among
all Holders thereof in proportion, as nearly as practicable, to the respective
amounts of Registrable Securities held by such Holders at the time of filing the
registration statements. No Registrable Securities excluded from the
underwriting by reason of the underwriter's marketing limitation shall be
included in such registration. To facilitate the allocation of shares in
accordance with the above provisions, the Company or the underwriters may round
the number of shares allocated to any Holder to the nearest 100 shares.

     If any Holder of Registrable Securities disapproves of the terms of the
underwriting, such person may elect to withdraw therefrom by written notice to
the Company, the managing underwriter and the Initiating Holders. The
Registrable Securities and/or other securities so withdrawn shall also be
withdrawn from registration, and such Registrable Securities shall not be
transferred in a public distribution prior to (i) 180 days after the effective
date of the initial registration of the Company's securities, (ii) 90 days after
the effective date of any subsequent registration, or (iii) such other shorter
period of time as the underwriters may reasonably require.

     If the underwriter has not limited the number of Registrable Securities to
be underwritten, the Company may include securities for its own account or the
account of others in such registration if the underwriter so agrees and the
number of Registrable Securities which would otherwise have been included in
such registration and underwriting will not thereby be limited.

     1.4  Company Registration.
          --------------------
          (a)  Notice of Registration. If at any time or from time to time the
               ----------------------
Company shall determine to register any of its securities, either for its own
account or the account of a security

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holder or holders, other than (i) a registration relating solely to employee
benefit plans, and (ii) a registration relating solely to a Commission Rule 145
transaction:

               (i)  promptly give to each Holder written notice thereof, and

               (ii) include in such registration (and any related qualification
under blue sky laws or other compliance), and in any underwriting involved
therein, all the Registrable Securities specified in a written request or
requests, made within 20 days after receipt of such written notice from the
Company by any Holder.

          (b)  Underwriting. If the registration of which the Company gives
               ------------
notice is for a registered public offering involving an underwriting, the
Company shall so advise the Holders as a part of the written notice given
pursuant to Section 1.4(a)(i). In such event the right of any Holder to
registration pursuant to Section 1.4 shall be conditioned upon such Holder's
participation in such underwriting and the inclusion of Registrable Securities
in the underwriting to the extent provided herein.

     All Holders proposing to distribute their securities through such
underwriting shall (together with the Company and the other holders distributing
their securities through such underwriting) enter into an underwriting agreement
in customary form with the managing underwriter selected for such underwriting
by the Company. Notwithstanding any other provision of this Section 1.3, if the
managing underwriter determines that marketing factors require a limitation of
the number of shares to be underwritten, the managing underwriter may limit the
Registrable Securities to be included in such registration. In such event, the
managing underwriter shall first limit or exclude up to all of the securities of
holders (other than Holders) proposing to distribute their securities through
such underwriting to be included in such registration and may thereafter limit
or exclude up to all of the Registrable Securities to be included in such
registration. The foregoing sentence notwithstanding, following the first such
registration, the managing underwriter may limit the number of shares to be
underwritten to not less than thirty percent (30%) of the shares included in the
registration even if as a result the numbers of shares of securities offered by
the Company is reduced. The Company shall so advise all Holders and other
holders distributing their securities through such underwriting and the number
of shares of Registrable Securities that may be included in the registration and
underwriting shall be allocated first among all Holders and thereafter to other
holders, all such allocations being made in proportion, as nearly as
practicable, to the respective amounts of Registrable Securities and Common
Stock held by such Holders and other holders at the time of filing the
registration statement. To facilitate the allocation of shares in accordance
with the above provisions, the Company may round the number of shares allocated
to any Holder or holder to the nearest 100 shares.

     If any Holder or holder disapproves of the terms of any such underwriting,
he or she may elect to withdraw therefrom by written notice to the Company and
the managing underwriter. Any securities excluded or withdrawn from such
underwriting shall be withdrawn from such registration, and shall not be
transferred in a public distribution prior to (i) 180 days after the effective
date of the initial registration of the Company's securities, (ii) 90 days after
the effective date of any subsequent registration, or (iii) such other shorter
period of time as the underwriters may require.

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          (c)  Right to Terminate Registration. The Company shall have the right
               -------------------------------
to terminate or withdraw any registration initiated by it under this Section 1.4
prior to the effectiveness of such registration whether or not any Holder has
elected to include securities in such registration.

     1.5  Registration on Form S-3.
          ------------------------

          (a)  If any Holder or Holders request that the Company file a
registration statement on Form S-3 (or any successor form to Form S-3) for a
public offering of shares of the Registrable Securities, the reasonably
anticipated aggregate price to the public of which would exceed $2,000,000, and
the Company is a registrant entitled to use Form S-3 to register the Registrable
Securities for such an offering, the Company shall use its best efforts to cause
such Registrable Securities to be registered for the offering on such form;
provided, however, that the Company shall not be required to effect more than
two registrations pursuant to this Section 1.5 in any 12-month period. The
Company will (i) promptly give written notice of the proposed registration to
all other Holders and (ii) as soon as practicable but in any event within ninety
(90) days, use its best efforts to file a registration statement with respect to
such Registrable Securities to effect such registration (including, without
limitation, the execution of an undertaking to file post-effective amendments,
appropriate qualification under applicable blue sky or other state securities
laws and appropriate compliance with applicable regulations issued under the
Securities Act and any other governmental requirements or regulations) as may be
so requested and as would permit or facilitate the sale and distribution of all
or such portion of such Registrable Securities as are specified in such request,
together with all or such portion of the Registrable Securities of any Holder of
Holders joining in such request as are specified in a written request received
by the Company within 20 days after receipt of such written notice from the
Company. The substantive provisions of Section 1.3(b) shall be applicable to
each registration initiated under this Section 1.5.

          (b)  Notwithstanding the foregoing, the Company shall not be obligated
to take any action pursuant to this Section 1.5 (i) if the Company, within ten
days of the receipt of the request of the Holders, gives notice of its bona fide
intention to effect the filing of a registration statement with the Commission
within 90 days of receipt of such request (other than with respect to a
registration statement relating to a Rule 145 transaction or an offering solely
to employees); (ii) within six months after the effective date of a registration
statement relating to an underwritten public offering of the Company's
securities filed under the Securities Act or (iii) if the Company shall furnish
to such Holder a certificate signed by the President of the Company stating that
in the good faith judgment of the Board of Directors it would be seriously
detrimental to the Company or its shareholders for registration statements to be
filed in the near future, then the Company's obligation to use its best efforts
to file a registration statement shall be deferred for a period not to exceed
180 days from the receipt of the request to file such registration by such
Holder; provided, however, that the Company will not exercise such right more
than once in any twelve month period.

     1.6  Limitations on Subsequent Registration Rights. From and after the
          ---------------------------------------------
Closing Date, the Company shall not enter into any agreement granting any holder
or prospective holder of any securities of the Company registration rights with
respect to such securities unless (i) such new registration rights, including
standoff obligations, are on a pari passu basis with those rights of the Holders
hereunder or (ii) such new registration rights, including standoff obligations,
are subordinate to the registration rights granted Holders hereunder.

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     1.7  Expenses of Registration.
          ------------------------

          (a)  All Registration Expenses incurred in connection with all
registrations pursuant to Sections 1.3 and 1.4 and three registrations under
Section 1.5 shall be borne by the Company. Unless otherwise stated, all Selling
Expenses relating to securities registered on behalf of the Holders and all
other Registration Expenses shall be borne by the Holders of such securities pro
rata on the basis of the number of shares so registered.

          (b)  All Registration Expenses and Selling Expenses incurred in
connection with more than three registrations pursuant to Section 1.5 shall be
borne pro rata by the Holder or Holders requesting such additional registration
on Form S-3 according to the number of Registrable Securities included in such
registration.

          (c)  The Company shall not be required to pay for expenses of any
registration proceeding begun pursuant to Section 1.3, the request for which is
subsequently withdrawn by the Initiating Holders for reasons other than a
material adverse change in the business or financial condition of the Company
occurring prior to the effectiveness of such registration statement, in which
case, such expenses shall be borne by the Holders of Registrable Securities
requesting such withdrawal, pro rata on the basis of the number of shares of
Registrable Securities so included in the registration request unless the
Holders of a majority of Registrable Securities agree to forfeit their right to
one requested registration pursuant to Section 1.3 in which event such right
shall be forfeited by all Holders. Notwithstanding the foregoing, however, if at
the time of the withdrawal, the Holders have learned of a material adverse
change in the condition, business or prospects of the Company from that known to
the Holders at the time of their request, of which the Company had knowledge at
the time of the request, then the Holders shall not be required to pay any of
said Registration Expenses or to forfeit the right to one demand registration.

     1.8  Obligations of the Company.  Whenever required under this Section 1 to
          --------------------------
effect the registration of any Registrable Securities, the Company shall, as
expeditiously as reasonably possible:

          (a)  Prepare and file with the Commission a registration statement
with respect to such Registrable Securities and use its diligent best efforts to
cause such registration statement to become effective, and, upon the request of
the Holders of a majority of the Registrable Securities registered thereunder,
keep such registration statement effective for up to 90 days or until the Holder
or Holders have completed the distribution relating thereto.

          (b)  Prepare and file with the Commission such amendments and
supplements to such registration statement as may be necessary to comply with
the provisions of the Securities Act with respect to the disposition of all
securities covered by such registration statement.

          (c)  Furnish to the Holders such numbers of copies of a prospectus,
including a preliminary prospectus, in conformity with the requirements of the
Securities Act, and such other documents as they may reasonably request in order
to facilitate the disposition of Registrable Securities owned by them.

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          (d)  Use its best efforts to register and qualify the securities
covered by such registration statement under such other securities or blue sky
laws of such jurisdictions as shall be reasonably requested by the Holders,
provided that the Company shall not be required in connection therewith or as a
condition thereto to qualify to do business or to file a general consent to
service of process in any such states or jurisdictions.

          (e)  In the event of any underwritten public offering, enter into and
perform its obligations under an underwriting agreement, in usual and customary
form, with the managing underwriter of such offering. Each Holder participating
in such underwriting shall also enter into and perform its obligations under
such an agreement.

          (f)  Notify each Holder of Registrable Securities covered by such
registration statement at any time when a prospectus relating thereto is
required to be delivered under the Securities Act of the happening of any event
as a result of which the prospectus included in such registration statement, as
then in effect, includes an untrue statement of a material fact or omits to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading in the light of the circumstances then
existing.

     1.9  Indemnification.
          ---------------

          (a)  To the extent permitted by law, the Company will indemnify each
Holder, each of its officers, directors, partners and affiliates, and each
person controlling such Holder, within the meaning of Section 15 of the
Securities Act, with respect to which registration, qualification or compliance
has been effected pursuant to this Agreement, and each underwriter, if any, and
each person who controls any underwriter within the meaning of Section 15 of the
Securities Act, against all expenses, claims, losses, damages or liabilities (or
actions in respect thereof), including any of the foregoing incurred in
settlement of any litigation, commenced or threatened, arising out of or based
on any untrue statement (or alleged untrue statement) of a material fact
contained in any registration statement, prospectus, offering circular or other
document, or any amendment or supplement thereto, incident to any such
registration, qualification or compliance, or based on any omission (or alleged
omission) to state therein a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances in which
they were made, not misleading, or any violation by the Company of any federal,
state or common law rule or regulation applicable to the Company in connection
with any such registration, qualification or compliance, and the Company will
reimburse each such Holder, each of its officers, directors and affiliates, and
each person controlling such Holder, each such underwriter and each person who
controls any such underwriter, for any legal and any other expenses reasonably
incurred in connection with investigating, preparing or defending any such
claim, loss, damage, liability or action, as such expenses are incurred,
provided that the Company will not be liable in any such case to the extent that
any such claim, loss, damage, liability or expense arises out of or is based on
any untrue statement or omission or alleged untrue statement or omission, made
in reliance upon and in conformity with written information furnished to the
Company by an instrument duly executed by such Holder, controlling person or
underwriter and stated to be specifically for use therein.

          (b)  To the extent permitted by law, each Holder will, if Registrable
Securities held by such Holder are included in the securities as to which such
registration, qualification or

                                                                             -8-
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compliance is being effected, indemnify the Company, each of its directors and
officers, each underwriter, if any, of the Company's securities covered by such
a registration statement, each person who controls the Company or such
underwriter within the meaning of Section 15 of the Securities Act, and each
other such Holder, each of its officers and directors and each person
controlling such Holder within the meaning of Section 15 of the Securities Act,
against all claims, losses, damages and liabilities (or actions in respect
thereof) arising out of or based on any untrue statement (or alleged untrue
statement) of a material fact contained in any such registration statement,
prospectus, offering circular or other document, or any omission (or alleged
omission) to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and will reimburse the
Company, such Holders, such directors, officers, persons, underwriters or
control persons for any legal or any other expenses reasonably incurred in
connection with investigating or defending any such claim, loss, damage,
liability or action, as such expenses are incurred, in each case to the extent,
but only to the extent, that such untrue statement (or alleged untrue statement)
or omission (or alleged omission) is made in such registration statement,
prospectus, offering circular or other document in reliance upon and in
conformity with written information furnished to the Company by an instrument
duly executed by such Holder and stated to be specifically for use therein.
Notwithstanding the foregoing, the liability of each Holder under this
subsection (b) shall be limited in an amount equal to the public offering price
of the shares sold by such Holder.

          (c)  Each party entitled to indemnification under this Section 1.9
(the "Indemnified Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought, and shall
permit the Indemnifying Party to assume the defense of any such claim or any
litigation resulting therefrom, provided that counsel for the Indemnifying
Party, who shall conduct the defense of such claim or litigation, shall be
approved by the Indemnified Party (whose approval shall not unreasonably be
withheld), and the Indemnified Party may participate in such defense at such
party's expense, and provided further that the failure of any Indemnified Party
to give notice as provided herein shall not relieve the Indemnifying Party of
its obligations under this Section 1.9 unless the failure to give such notice is
materially prejudicial to an Indemnifying Party's ability to defend such action
and provided further, that the Indemnifying Party shall not assume the defense
for matters as to which there is a conflict of interest or separate and
different defenses. No Indemnifying Party, in the defense of any such claim or
litigation, shall, except with the consent of each Indemnified Party, consent to
entry of any judgment or enter into any settlement which does not include as an
unconditional term thereof the giving by the claimant or plaintiff to such
Indemnified Party of a release from all liability in respect to such claim or
litigation. No Indemnified Party shall consent to entry of any judgment or enter
into any settlement without the consent of each Indemnifying Party, which
consent shall not be unreasonable withheld.

          (d)  If the indemnification provided for in this Section 1.9 is held
by a court of competent jurisdiction to be unavailable to an indemnified party
with respect to any loss, liability, claim, damage, or expense referred to
therein, then the indemnifying party, in lieu of indemnifying such indemnified
party hereunder, shall contribute to the amount paid or payable by such
indemnified party as a result of such loss, liability, claim, damage, or expense
in such proportion as is appropriate to reflect the relative fault of the
indemnifying party on the one hand and of the indemnified party on the other in
connection with the statements or omissions that resulted in such

                                                                             -9-
<PAGE>

loss, liability, claim, damage, or expense as well as any other relevant
equitable considerations. The relative fault of the indemnifying party and of
the indemnified party shall be determined by reference to, among other things,
whether the untrue or alleged untrue statement of a material fact or the
omission or alleged to state a material fact relates to information supplied by
the indemnifying party or by the indemnified party and the parties' relative
intent, knowledge, access to information, and opportunity to correct or prevent
such statement or omission.

          (e)  Notwithstanding the foregoing, to the extent that the provisions
on indemnification and contribution contained in the underwriting agreement
entered into in connection with the underwritten public offering are in conflict
with the foregoing provisions, the provisions in the underwriting agreement
shall control.

     1.10  Information by Holder. The Holder or Holders of Registrable
           ---------------------
Securities included in any registration shall furnish to the Company such
information regarding such Holder or Holders, the Registrable Securities held by
them and the distribution proposed by such Holder or Holders as the Company may
reasonably request in writing and as shall be reasonably required in connection
with any registration, qualification or compliance referred to in this Section
1.

     1.11  Rule 144 Reporting.  With a view to making available the benefits of
           ------------------
certain rules and regulations of the Commission which may at any time permit the
sale of the Restricted Securities to the public without registration, after such
time as a public market exists for the Common Stock of the Company, the Company
agrees to use its best efforts to:

          (a)  Make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act, at all times after
the effective date that the Company becomes subject to the reporting
requirements of the Securities Act or the Securities Exchange Act of 1934, as
amended.

          (b)  File with the Commission in a timely manner all reports and other
documents required of the Company under the Securities Act and the Securities
Exchange Act of 1934, as amended (at any time after it has become subject to
such reporting requirements).

          (c)  So long as a Holder owns any Restricted Securities, to furnish to
the Holder forthwith upon request a written statement by the Company as to its
compliance with the reporting requirements of said Rule 144 (at any time after
90 days after the effective date of the first registration statement filed by
the Company for an offering of its securities to the general public), and of the
Securities Act and the Securities Exchange Act of 1934 (at any time after it has
become subject to such reporting requirements), a copy of the most recent annual
or quarterly report of the Company, and such other reports and documents of the
Company and other information in the possession of or reasonably obtainable by
the Company as a Holder may reasonably request in availing itself of any rule or
regulation of the Commission allowing a Holder to sell any such securities
without registration.

     1.12  Transfer of Registration Rights.  The rights to cause the Company to
           -------------------------------
register securities granted Holders under Sections 1.3, and 1.4 and 1.5 may be
assigned to a transferee or assignee reasonably acceptable to the Company in
connection with any transfer or assignment of

                                                                            -10-
<PAGE>

Registrable Securities by a Holder provided that: (i) such transfer may
otherwise be effected in accordance with applicable securities laws and (ii)
such assignee or transferee acquires at least 100,000 shares of Registrable
Securities (or if less, all of such shares held by such Holder) (appropriately
adjusted for stock splits, combinations, recapitalizations and the like).
Notwithstanding the foregoing, the rights to cause the Company to register
securities may be assigned to any constituent partner, or retired partner, or to
the estate of any of the partners or retired partners of a Holder identified as
a partnership herein without compliance with item (ii) above, provided written
notice thereof is promptly given to the Company.

     1.13  Standoff Agreement. Each Holder agrees in connection with the initial
           ------------------
registration of the Company's securities that, upon request of the Company or
the underwriters managing any underwritten initial public offering of the
Company's securities, not to sell, make any short sale of, loan, grant any
option for the purchase of, or otherwise dispose of any Registrable Securities
(other than those included in the registration) without the prior written
consent of the Company or such underwriters, as the case may be, for such period
of time (not to exceed 180 days) from the effective date of such registration as
may be reasonably requested by the underwriters, provided that the officers and
directors of the Company who own securities of the Company also agree to such
restrictions. Each Holder further agrees that in connection with any subsequent
registrations of the Company's securities that follow the initial registration,
upon request of the Company, or the underwriters managing such underwritten
public offerings of the Company's securities, not to sell, make any short sale
of, loan, grant any option for the purchase of, or otherwise dispose of any,
Registrable Securities (other than those included in the registration) without
the prior written consent of the Company or such underwriters, as the case may
be, for such period of time (not to exceed 90 days) from the effective date of
such registrations as may be reasonably requested by the underwriters, provided
that the officers and directors of the Company who own securities of the
Company, also agree to such restrictions. The shares held by all constituent
partners of any entity holding registration rights hereunder shall be bound by
this standoff agreement.

     1.14  Holders Who May Sell.  The rights to cause the Company to register
           --------------------
securities granted to Holders under Sections 1.3, 1.4 and 1.5 shall terminate
with regard to any Holders who can sell all of their shares under Rule 144
(excluding 144A) within a three month period.

                                  SECTION 2.

                                 Miscellaneous

     2.1   Governing Law. This Agreement shall be governed in all respects by
           -------------
the internal laws of the State of California.

     2.2   Successors and Assigns.  Except as otherwise provided herein, the
           ----------------------
provisions hereof shall inure to the benefit of, and be binding upon, the
successors, assigns, heirs, executors and administrators of the parties hereto.

     2.3   Entire Agreement; Amendment. This Agreement and the Purchase
           ---------------------------
Agreement constitute the full and entire understanding and agreement between the
parties with regard to the subjects hereof and thereof, and no party shall be
liable or bound to any other party in any manner by

                                                                            -11-
<PAGE>

any warranties, representations or covenants except as specifically set forth
herein or therein. Except as expressly provided herein, neither this Agreement
nor any term hereof may be amended, waived, discharged or terminated other than
by a written instrument signed by the party against whom enforcement of any such
amendment, waiver, discharge or termination is sought; provided, however, that
holders of a majority of the Preferred Shares and the holders of a majority of
the shares held by the Founders may, with the Company's prior written consent,
waive, modify or amend on behalf of all holders, any provisions hereof.

     2.4  Effect of Amendment or Waiver. The Purchasers and their successors and
          -----------------------------
assigns acknowledge that by the operation of Section 2.3 of this Agreement and
the holders of a majority of the outstanding Preferred Shares and the holders of
a majority of the outstanding shares held by the Founders, acting in conjunction
with the Company, will have the right and power to diminish or eliminate any or
all rights or increase any or all obligations pursuant to this Agreement.

     2.5  Rights of Holders. Each holder of Registrable Securities shall have
          -----------------
the absolute right to exercise or refrain from exercising any right or rights
that such holder may have by reason of this Agreement, including, without
limitation the right to consent to the waiver or modification of any obligation
under this Agreement, and such holder shall not incur any liability to any other
holder of any securities of the Company as a result of exercising or refraining
from exercising any such right or rights.

     2.6  Delays or Omissions. No delay or omission to exercise any right, power
          -------------------
or remedy accruing to any party to this Agreement, upon any breach or default of
the other party, shall impair any such right, power or remedy of such non-
breaching party nor shall it be construed to be a waiver of any such breach or
default, or an acquiescence therein, or of or is any similar breach as default
thereafter accruing; nor shall any waiver of any single breach or default be
deemed a waiver of any other breach or default theretofore or thereafter
occurring. Any waiver, permit, consent or approval of any kind as character on
the part of any party of any breach or default under this Agreement, or any
waiver on the part of any party of any provisions or conditions of this
Agreement, must be made in writing and shall be effective only to the extent
specifically set forth in such writing. All remedies, either under this
Agreement, or by law or otherwise afforded to any holder, shall be cumulative
and not alternative.

     2.7  Notices, etc. All notices and other communications required or
          ------------
permitted hereunder shall be in writing and shall be mailed by registered or
certified mail, postage prepaid, or otherwise delivered by hand or by messenger,
addressed (a) if to any holder of any Registrable Securities, at such address as
such holder shall have furnished the Company in writing, or, until any such
holder so furnishes an address to the Company, then to and at the address of the
last holder of such shares who has so furnished an address to the Company or (b)
if to the Company, one copy should be sent to its address set forth above and
addressed to the attention of the Corporate Secretary, or at such other address
as the Company shall have furnished to the holders.

     Each such notice or other communication shall for all purposes of this
Agreement be treated as effective or having been given when delivered if
delivered personally or by messenger, or, if sent by mail, at the earlier of its
receipt or 72 hours after the same has been deposited in a regularly maintained
receptacle for the deposit of the United States mail, addressed and mailed as
aforesaid.

                                                                            -12-
<PAGE>

     2.8  Counterparts.  This Agreement may be executed in any number of
          ------------
counterparts, each of which may be executed by less than all parties to this
Agreement, each of which shall be enforceable against the parties actually
executing such counterparts, and all of which together shall constitute one
instrument.

     2.9  Severability. In the event that any provision of this Agreement
          ------------
becomes or is declared by a court of competent jurisdiction to be illegal,
unenforceable or void, this Agreement shall continue in full force and effect
without said provision.

     2.10 Titles and Subtitles. The titles and subtitles used in this Agreement
          --------------------
are used for convenience only and are not considered in construing or
interpreting this Agreement.

                                                                            -13-
<PAGE>

     The foregoing agreement is hereby executed as of the date first above
written.

                                    "COMPANY"

                                    Synplicity, Inc.,
                                    a California corporation

                                    By: /s/ Bernard Aronson
                                       ----------------------------------------

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

"EXISTING SHAREHOLDERS"             /s/ Andreas Bechtolsheim
                                    -------------------------------------------
                                    Andreas Bechtolsheim

                                    /s/ Prahbu Goel
                                    -------------------------------------------
                                    The Goel Family Partnership

                                    /s/ Prahbu Goel
                                    -------------------------------------------
                                    Prabhu Goel as custodian of Pooneet Goel

                                    /s/ Prahbu Goel
                                    -------------------------------------------
                                    Prabhu Goel as custodian for Priyanka Goel

                                    /s/ Kenneth McElvain
                                    -------------------------------------------
                                    Kenneth McElvain

                                    /s/ Alisa Yaffa
                                    -------------------------------------------
                                    Alisa Yaffa

                                    /s/ Kevin Hall
                                    -------------------------------------------
                                    Norwest Venture Partners VII, L.L.P.
                                    ____________, as General Partner

                                    /s/ Kevin Hall
                                    -------------------------------------------
                                    Kevin G. Hall, Trustee of Kevin G. Hall
                                    Revocable Trust - 1998

<PAGE>

                                    /s/ Sam Baker
                                    -------------------------------------------
                                    Pilgrim Baxter Hybrid Partners I, L.P.
                                    ____________, as General Partner

                                    /s/ Markus von Bechtolsheim
                                    -------------------------------------------
                                    Markus von Bechtolsheim

                                        /s/ Andreas Bechtolsheim
"PURCHASERS"                        By:----------------------------------------
                                       Andreas Bechtolsheim

                                        /s/ Bruce R. Katz
                                    By:----------------------------------------
                                       Bruce R. Katz

                                    XILINX, INC.

                                        /s/ [ILLEGIBLE]
                                    By:----------------------------------------

                                            Chief Financial Officer
                                    Title:-------------------------------------

                                    COMDISCO, INC.

                                        /s/ [ILLEGIBLE]
                                    By:----------------------------------------

                                           Senior Vice President
                                    Title:-------------------------------------

                                    NORWEST VENTURE PARTNERS VII, L.L.P.

                                    By:  Itasca VC Partners VII, L.L.P.
                                         Its General Partner

                                         /s/ Kevin Hall
                                    By:________________________________________
                                         General Partner

                                      -2-

<PAGE>

                                    KEVIN HALL FAMILY PARTNERS, A CALIFORNIA
                                    LIMITED PARTNERSHIP

                                         /s/ Kevin G. Hall
                                    By:----------------------------------------
                                         Kevin G. Hall

                                    THE GOEL FAMILY PARTNERSHIP

                                         /s/ Prahbu Goel
                                    By:----------------------------------------
                                         General Partner

                                    PILGRIM BAXTER HYBRID PARTNERS I, L.P.

                                         /s/ Sam Baker
                                    By:----------------------------------------
                                         General Partner

                                                                             -3-
<PAGE>

                                    EXHIBIT A

                             EXISTING SHAREHOLDERS

     Andreas Bechtolsheim
     The Goel Family Partnership
     Prabhu Goel as custodian for Pooneet Goel
     Prabhu Goel as custodian for Priyanka Goel
     Kenneth McElvain
     Alisa Yaffa
     Norwest Venture Partners VII, L.L.P
     Kevin G. Hall Revocable Trust - 1998
     Pilgrim Baxter Hybrid Partners I, L.P.
     Markus von Bechtolsheim

<PAGE>

                                   EXHIBIT B

                                  PURCHASERS

     Andreas Bechtolsheim
     Bruce R. Katz
     Xilinx, Inc.
     Comdisco, Inc.
     Norwest Venture Partners VII, L.L.P
     Kevin Hall Family Partners, a California limited partnership
     The Goel Family Partnership
     Pilgrim Baxter Hybrid Partners I, L.P.<PAGE>

                                                                    EXHIBIT 10.1

                                  APPENDIX C
                                  ----------

                               SYNPLICITY, INC.

                           INDEMNIFICATION AGREEMENT

     This Indemnification Agreement ("Agreement") is effective as of
___________, 2000 by and between Synplicity, Inc., a California corporation (the
"Company"), and ______________ ("Indemnitee").

     WHEREAS, the Company desires to attract and retain the services of highly
qualified individuals, such as Indemnitee, to serve the Company and its related
entities;

     WHEREAS, in order to induce Indemnitee to continue to provide services to
the Company, the Company wishes to provide for the indemnification of, and the
advancement of expenses to, Indemnitee to the maximum extent permitted by law;

     WHEREAS, the Company and Indemnitee recognize the continued difficulty in
obtaining liability insurance for the Company's directors, officers, employees,
agents and fiduciaries, the significant increases in the cost of such insurance
and the general reductions in the coverage of such insurance;

     WHEREAS, the Company and Indemnitee further recognize the substantial
increase in corporate litigation in general, subjecting directors, officers,
employees, agents and fiduciaries to expensive litigation risks at the same time
as the availability and coverage of liability insurance has been severely
limited; and

     WHEREAS, in connection with the Company's initial public offering, the
Company and Indemnitee desire to continue to have in place the additional
protection provided by an indemnification agreement, with such changes as are
required to conform the existing agreement to California law and to provide
indemnification and advancement of expenses to the Indemnitee to the maximum
extent permitted by California law;

     WHEREAS, in view of the considerations set forth above, the Company desires
that Indemnitee shall be indemnified and advanced expenses by the Company as set
forth herein;

     NOW, THEREFORE, the Company and Indemnitee hereby agree as set forth below.

     1.   Certain Definitions.
          -------------------

          a.   "Change in Control" shall mean, and shall be deemed to have
occurred if, on or after the date of this Agreement, (i) any "person" (as such
term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934,
as amended), other than a trustee or other fiduciary holding securities under an
employee benefit plan of the Company acting in such capacity or a corporation
owned directly or indirectly by the Shareholders of the Company in substantially
the same
<PAGE>

proportions as their ownership of stock of the Company, becomes the "beneficial
owner" (as defined in Rule 13d-3 under said Act), directly or indirectly, of
securities of the Company representing more than 50% of the total voting power
represented by the Company's then outstanding Voting Securities, (ii) during any
period of two consecutive years, individuals who at the beginning of such period
constitute the Board of Directors of the Company and any new director whose
election by the Board of Directors or nomination for election by the Company's
Shareholders was approved by a vote of at least two thirds (2/3) of the
directors then still in office who either were directors at the beginning of the
period or whose election or nomination for election was previously so approved,
cease for any reason to constitute a majority thereof, (iii) the Shareholders of
the Company approve a merger or consolidation of the Company with any other
corporation other than a merger or consolidation which would result in the
Voting Securities of the Company outstanding immediately prior thereto
continuing to represent (either by remaining outstanding or by being converted
into Voting Securities of the surviving entity) at least 80% of the total voting
power represented by the Voting Securities of the Company or such surviving
entity outstanding immediately after such merger or consolidation, or (iv) the
Shareholders of the Company approve a plan of complete liquidation of the
Company or an agreement for the sale or disposition by the Company of (in one
transaction or a series of related transactions) all or substantially all of the
Company's assets.

          b.   "Claim" shall mean with respect to a Covered Event: any
threatened, pending or completed action, suit, proceeding or alternative dispute
resolution mechanism, or any hearing, inquiry or investigation that Indemnitee
in good faith believes might lead to the institution of any such action, suit,
proceeding or alternative dispute resolution mechanism, whether civil, criminal,
administrative, investigative or other.

          c.   References to the "Company" shall include, in addition to
Synplicity, Inc., any constituent corporation (including any constituent of a
constituent) absorbed in a consolidation or merger to which Synplicity, Inc. (or
any of its wholly owned subsidiaries) is a party which, if its separate
existence had continued, would have had power and authority to indemnify its
directors, officers, employees, agents or fiduciaries, so that if Indemnitee is
or was a director, officer, employee, agent or fiduciary of such constituent
corporation, or is or was serving at the request of such constituent corporation
as a director, officer, employee, agent or fiduciary of another corporation,
partnership, joint venture, employee benefit plan, trust or other enterprise,
Indemnitee shall stand in the same position under the provisions of this
Agreement with respect to the resulting or surviving corporation as Indemnitee
would have with respect to such constituent corporation if its separate
existence had continued.

          d.   "Covered Event" shall mean any event or occurrence related to the
fact that Indemnitee is or was a director, officer, employee, agent or fiduciary
of the Company, or any subsidiary of the Company, or is or was serving at the
request of the Company as a director, officer, employee, agent or fiduciary of
another corporation, partnership, joint venture, trust or other enterprise, or
by reason of any action or inaction on the part of Indemnitee while serving in
such capacity.

          e.   "Expenses" shall mean any and all expenses (including attorneys'
fees and all other costs, expenses and obligations incurred in connection with
investigating, defending, being a witness in or participating in (including on
appeal), or preparing to defend, to be a witness in or to participate in, any
action, suit, proceeding, alternative dispute resolution mechanism, hearing,

                                      -2-
<PAGE>

inquiry or investigation), judgments, fines, penalties and amounts paid in
settlement (if such settlement is approved in advance by the Company, which
approval shall not be unreasonably withheld) of any Claim and any federal,
state, local or foreign taxes imposed on the Indemnitee as a result of the
actual or deemed receipt of any payments under this Agreement.

          f.   "Expense Advance" shall mean a payment to Indemnitee pursuant to
Section 3 of Expenses in advance of the settlement of or final judgement in any
action, suit, proceeding or alternative dispute resolution mechanism, hearing,
inquiry or investigation which constitutes a Claim.

          g.   "Independent Legal Counsel" shall mean an attorney or firm of
attorneys, selected in accordance with the provisions of Section 2(d) hereof,
who shall not have otherwise performed services for the Company or Indemnitee
within the last three years (other than with respect to matters concerning the
rights of Indemnitee under this Agreement, or of other Indemnitees under similar
indemnity agreements).

          h.   References to "other enterprises" shall include employee benefit
plans; references to "fines" shall include any excise taxes assessed on
Indemnitee with respect to an employee benefit plan; and references to "serving
at the request of the Company" shall include any service as a director, officer,
employee, agent or fiduciary of the Company which imposes duties on, or involves
services by, such director, officer, employee, agent or fiduciary with respect
to an employee benefit plan, its participants or its beneficiaries; and if
Indemnitee acted in good faith and in a manner Indemnitee reasonably believed to
be in the interest of the participants and beneficiaries of an employee benefit
plan, Indemnitee shall be deemed to have acted in a manner "not opposed to the
best interests of the Company" as referred to in this Agreement.

          i.   "Reviewing Party" shall mean, subject to the provisions of
Section 2(d), any person or body appointed by the Board of Directors in
accordance with applicable law to review the Company's obligations hereunder and
under applicable law, which may include a member or members of the Company's
Board of Directors, Independent Legal Counsel or any other person or body not a
party to the particular Claim for which Indemnitee is seeking indemnification.

          j.   "Section" refers to a section of this Agreement unless otherwise
indicated.

          k.   "Voting Securities" shall mean any securities of the Company that
vote generally in the election of directors.

                                      -3-
<PAGE>

     2.   Indemnification.
          ---------------

          a.   Indemnification of Expenses.  Subject to the provisions of
               ---------------------------
Section 2(b) below, the Company shall indemnify Indemnitee for Expenses to the
fullest extent permitted by law if Indemnitee was or is or becomes a party to or
witness or other participant in, or is threatened to be made a party to or
witness or other participant in, any Claim (whether by reason of or arising in
part out of a Covered Event), including all interest, assessments and other
charges paid or payable in connection with or in respect of such Expenses.

          b.   Review of Indemnification Obligations.  Notwithstanding the
               -------------------------------------
foregoing, in the event any Reviewing Party shall have determined (in a written
opinion, in any case in which Independent Legal Counsel is the Reviewing Party)
that Indemnitee is not entitled to be indemnified hereunder under applicable
law, (i) the Company shall have no further obligation under Section 2(a) to make
any payments to Indemnitee not made prior to such determination by such
Reviewing Party, and (ii) the Company shall be entitled to be reimbursed by
Indemnitee (who hereby agrees to reimburse the Company) for all Expenses
theretofore paid to Indemnitee to which Indemnitee is not entitled hereunder
under applicable law; provided, however, that if Indemnitee has commenced or
                      --------  -------
thereafter commences legal proceedings in a court of competent jurisdiction to
secure a determination that Indemnitee is entitled to be indemnified hereunder
under applicable law, any determination made by any Reviewing Party that
Indemnitee is not entitled to be indemnified hereunder under applicable law
shall not be binding and Indemnitee shall not be required to reimburse the
Company for any Expenses theretofore paid in indemnifying Indemnitee until a
final judicial determination is made with respect thereto (as to which all
rights of appeal therefrom have been exhausted or lapsed). Indemnitee's
obligation to reimburse the Company for any Expenses shall be unsecured and no
interest shall be charged thereon.

          c.   Indemnitee Rights on Unfavorable Determination; Binding Effect.
               --------------------------------------------------------------
If any Reviewing Party determines that Indemnitee substantively is not entitled
to be indemnified hereunder in whole or in part under applicable law, Indemnitee
shall have the right to commence litigation seeking an initial determination by
the court or challenging any such determination by such Reviewing Party or any
aspect thereof, including the legal or factual bases therefor, and, subject to
the provisions of Section 15, the Company hereby consents to service of process
and to appear in any such proceeding. Absent such litigation, any determination
by any Reviewing Party shall be conclusive and binding on the Company and
Indemnitee.

          d.   Selection of Reviewing Party; Change in Control.  If there has
               -----------------------------------------------
not been a Change in Control, any Reviewing Party shall be selected by the Board
of Directors, and if there has been such a Change in Control (other than a
Change in Control which has been approved by a majority of the Company's Board
of Directors who were directors immediately prior to such Change in Control),
any Reviewing Party with respect to all matters thereafter arising concerning
the rights of Indemnitee to indemnification of Expenses under this Agreement or
any other agreement or under the Company's Articles of Incorporation or Bylaws
as now or hereafter in effect, or under any other applicable law, if desired by
Indemnitee, shall be Independent Legal Counsel selected by Indemnitee and
approved by the Company (which approval shall not be unreasonably withheld).
Such counsel, among other things, shall render its written opinion to the
Company and Indemnitee as to whether and to what extent Indemnitee would be
entitled to be indemnified hereunder under applicable law

                                      -4-
<PAGE>

and the Company agrees to abide by such opinion. The Company agrees to pay the
reasonable fees of the Independent Legal Counsel referred to above and to
indemnify fully such counsel against any and all expenses (including attorneys'
fees), claims, liabilities and damages arising out of or relating to this
Agreement or its engagement pursuant hereto. Notwithstanding any other provision
of this Agreement, the Company shall not be required to pay Expenses of more
than one Independent Legal Counsel in connection with all matters concerning a
single Indemnitee, and such Independent Legal Counsel shall be the Independent
Legal Counsel for any or all other Indemnitees unless (i) the employment of
separate counsel by one or more Indemnitees has been previously authorized by
the Company in writing, or (ii) an Indemnitee shall have provided to the Company
a written statement that such Indemnitee has reasonably concluded that there may
be a conflict of interest between such Indemnitee and the other Indemnitees with
respect to the matters arising under this Agreement.

          e.   Mandatory Payment of Expenses.  Notwithstanding any other
               -----------------------------
provision of this Agreement other than Section 10 hereof, to the extent that
Indemnitee has been successful on the merits or otherwise, including, without
limitation, the dismissal of an action without prejudice, in defense of any
Claim, Indemnitee shall be indemnified against all Expenses incurred by
Indemnitee in connection therewith.

     3.   Expense Advances.
          ----------------

          a.   Obligation to Make Expense Advances.  Upon receipt of a written
               -----------------------------------
undertaking by or on behalf of the Indemnitee to repay such amounts if it shall
ultimately be determined that the Indemnitee is not entitled to be indemnified
therefore by the Company hereunder under applicable law, the Company shall make
Expense Advances to Indemnitee.

          b.   Form of Undertaking.  Any obligation to repay any Expense
               -------------------
Advances hereunder pursuant to a written undertaking by the Indemnitee shall be
unsecured and no interest shall be charged thereon.

          c.   Determination of Reasonable Expense Advances.  The parties agree
               --------------------------------------------
that for the purposes of any Expense Advance for which Indemnitee has made
written demand to the Company in accordance with this Agreement, all Expenses
included in such Expense Advance that are certified by affidavit of Indemnitee's
counsel as being reasonable shall be presumed conclusively to be reasonable.

     4.   Procedures for Indemnification and Expense Advances.
          ---------------------------------------------------

          a.   Timing of Payments.  All payments of Expenses (including without
               ------------------
limitation Expense Advances) by the Company to the Indemnitee pursuant to this
Agreement shall be made to the fullest extent permitted by law as soon as
practicable after written demand by Indemnitee therefor is presented to the
Company, but in no event later than thirty (30) business days after such written
demand by Indemnitee is presented to the Company, except in the case of Expense
Advances, which shall be made no later than ten (10) business days after such
written demand by Indemnitee is presented to the Company.

                                      -5-
<PAGE>

          b.   Notice/Cooperation by Indemnitee.  Indemnitee shall, as a
               --------------------------------
condition precedent to Indemnitee's right to be indemnified or Indemnitee's
right to receive Expense Advances under this Agreement, give the Company notice
in writing as soon as practicable of any Claim made against Indemnitee for which
indemnification will or could be sought under this Agreement. Notice to the
Company shall be directed to the Chief Executive Officer of the Company at the
address shown on the signature page of this Agreement (or such other address as
the Company shall designate in writing to Indemnitee). In addition, Indemnitee
shall give the Company such information and cooperation as it may reasonably
require and as shall be within Indemnitee's power.

          c.   No Presumptions; Burden of Proof.  For purposes of this
               --------------------------------
Agreement, the termination of any Claim by judgment, order, settlement (whether
with or without court approval) or conviction, or upon a plea of nolo
                                                                 ----
contendere, or its equivalent, shall not create a presumption that Indemnitee
----------
did not meet any particular standard of conduct or have any particular belief or
that a court has determined that indemnification is not permitted by this
Agreement or applicable law. In addition, neither the failure of any Reviewing
Party to have made a determination as to whether Indemnitee has met any
particular standard of conduct or had any particular belief, nor an actual
determination by any Reviewing Party that Indemnitee has not met such standard
of conduct or did not have such belief, prior to the commencement of legal
proceedings by Indemnitee to secure a judicial determination that Indemnitee
should be indemnified under this Agreement under applicable law, shall be a
defense to Indemnitee's claim or create a presumption that Indemnitee has not
met any particular standard of conduct or did not have any particular belief. In
connection with any determination by any Reviewing Party or otherwise as to
whether the Indemnitee is entitled to be indemnified hereunder under applicable
law, the burden of proof shall be on the Company to establish that Indemnitee is
not so entitled.

          d.   Notice to Insurers.  If, at the time of the receipt by the
               ------------------
Company of a notice of a Claim pursuant to Section 4(b) hereof, the Company has
liability insurance in effect which may cover such Claim, the Company shall give
prompt notice of the commencement of such Claim to the insurers in accordance
with the procedures set forth in the respective policies. The Company shall
thereafter take all necessary or desirable action to cause such insurers to pay,
on behalf of the Indemnitee, all amounts payable as a result of such Claim in
accordance with the terms of such policies.

          e.   Selection of Counsel.  In the event the Company shall be
               --------------------
obligated hereunder to provide indemnification for or make any Expense Advances
with respect to the Expenses of any Claim, the Company, if appropriate, shall be
entitled to assume the defense of such Claim with counsel approved by Indemnitee
(which approval shall not be unreasonably withheld) upon the delivery to
Indemnitee of written notice of the Company's election to do so. After delivery
of such notice, approval of such counsel by Indemnitee and the retention of such
counsel by the Company, the Company will not be liable to Indemnitee under this
Agreement for any fees or expenses of separate counsel subsequently retained by
or on behalf of Indemnitee with respect to the same Claim; provided that, (i)
Indemnitee shall have the right to employ Indemnitee's separate counsel in any
such Claim at Indemnitee's expense and (ii) if (A) the employment of separate
counsel by Indemnitee has been previously authorized by the Company, (B)
Indemnitee shall have reasonably concluded that there may be a conflict of
interest between the Company and Indemnitee in the conduct of any such defense,
or (C) the Company shall not continue to retain such counsel to defend

                                      -6-
<PAGE>

such Claim, then the fees and expenses of Indemnitee's separate counsel shall be
Expenses for which Indemnitee may receive indemnification or Expense Advances
hereunder.

     5.   Additional Indemnification Rights; Nonexclusivity.
          -------------------------------------------------

          a.   Scope.  The Company hereby agrees to indemnify the Indemnitee to
               -----
the fullest extent permitted by law, notwithstanding that such indemnification
is not specifically authorized by the other provisions of this Agreement, the
Company's Articles of Incorporation, the Company's Bylaws or by statute. In the
event of any change after the date of this Agreement in any applicable law,
statute or rule which expands the right of a California corporation to indemnify
a member of its board of directors or an officer, employee, agent or fiduciary,
it is the intent of the parties hereto that Indemnitee shall enjoy by this
Agreement the greater benefits afforded by such change. In the event of any
change in any applicable law, statute or rule which narrows the right of a
California corporation to indemnify a member of its board of directors or an
officer, employee, agent or fiduciary, such change, to the extent not otherwise
required by such law, statute or rule to be applied to this Agreement, shall
have no effect on this Agreement or the parties' rights and obligations
hereunder except as set forth in Section 10(a) hereof.

          b.   Nonexclusivity.  The indemnification and the payment of Expense
               --------------
Advances provided by this Agreement shall be in addition to any rights to which
Indemnitee may be entitled under the Company's Articles of Incorporation, its
Bylaws, any other agreement, any vote of Shareholders or disinterested
directors, the Corporation Law of the State of California, or otherwise. The
indemnification and the payment of Expense Advances provided under this
Agreement shall continue as to Indemnitee for any action taken or not taken
while serving in an indemnified capacity even though subsequent thereto
Indemnitee may have ceased to serve in such capacity.

     6.   No Duplication of Payments.  The Company shall not be liable under
          --------------------------
this Agreement to make any payment in connection with any Claim made against
Indemnitee to the extent Indemnitee has otherwise actually received payment
(under any insurance policy, provision of the Company's Articles of
Incorporation, Bylaws or otherwise) of the amounts otherwise payable hereunder.

     7.   Partial Indemnification.  If Indemnitee is entitled under any
          -----------------------
provision of this Agreement to indemnification by the Company for some or a
portion of Expenses incurred in connection with any Claim, but not, however, for
all of the total amount thereof, the Company shall nevertheless indemnify
Indemnitee for the portion of such Expenses to which Indemnitee is entitled.

                                      -7-
<PAGE>

     8.   Mutual Acknowledgment.  Both the Company and Indemnitee acknowledge
          ---------------------
that in certain instances, federal law or applicable public policy may prohibit
the Company from indemnifying its directors, officers, employees, agents or
fiduciaries under this Agreement or otherwise. Indemnitee understands and
acknowledges that the Company has undertaken or may be required in the future to
undertake with the Securities and Exchange Commission to submit the question of
indemnification to a court in certain circumstances for a determination of the
Company's right under public policy to indemnify Indemnitee.

     9.   Liability Insurance.  To the extent the Company maintains liability
          -------------------
insurance applicable to directors, officers, employees, agents or fiduciaries,
Indemnitee shall be covered by such policies in such a manner as to provide
Indemnitee the same rights and benefits as are provided to the most favorably
insured of the Company's directors, if Indemnitee is a director; or of the
Company's officers, if Indemnitee is not a director of the Company but is an
officer; or of the Company's key employees, agents or fiduciaries, if Indemnitee
is not an officer or director but is a key employee, agent or fiduciary.

     10.  Exceptions.  Notwithstanding any other provision of this Agreement,
          ----------
the Company shall not be obligated pursuant to the terms of this Agreement:

          a.   Excluded Action or Omissions.  To indemnify or make Expense
               ----------------------------
Advances to Indemnitee with respect to Claims arising out of acts, omissions or
transactions for which Indemnitee is prohibited from receiving indemnification
under applicable law.

          b.   Claims Initiated by Indemnitee.  To indemnify or make Expense
               ------------------------------
Advances to Indemnitee with respect to Claims initiated or brought voluntarily
by Indemnitee and not by way of defense, counterclaim or cross-claim, except (i)
with respect to actions or proceedings brought to establish or enforce a right
to indemnification under this Agreement or any other agreement or insurance
policy or under the Company's Articles of Incorporation or Bylaws now or
hereafter in effect relating to Claims for Covered Events, (ii) in specific
cases if the Board of Directors has approved the initiation or bringing of such
Claim, or (iii) as otherwise required under Section 145 of the California
General Corporation Law, regardless of whether Indemnitee ultimately is
determined to be entitled to such indemnification, Expense Advances, or
insurance recovery, as the case may be.

          c.   Lack of Good Faith.  To indemnify Indemnitee for any Expenses
               ------------------
incurred by the Indemnitee with respect to any action instituted (i) by
Indemnitee to enforce or interpret this Agreement, if a court having
jurisdiction over such action determines as provided in Section 13 that each of
the material assertions made by the Indemnitee as a basis for such action was
not made in good faith or was frivolous, or (ii) by or in the name of the
Company to enforce or interpret this Agreement, if a court having jurisdiction
over such action determines as provided in Section 13 that each of the material
defenses asserted by Indemnitee in such action was made in bad faith or was
frivolous.

          d.   Claims Under Section 16(b).  To indemnify Indemnitee for Expenses
               --------------------------
and the payment of profits arising from the purchase and sale by Indemnitee of
securities in violation of Section 16(b) of the Securities Exchange Act of 1934,
as amended, or any similar successor statute.

                                      -8-
<PAGE>

     11.  Counterparts.  This Agreement may be executed in one or more
          ------------
counterparts, each of which shall constitute an original.

     12.  Binding Effect; Successors and Assigns.  This Agreement shall be
          --------------------------------------
binding upon and inure to the benefit of and be enforceable by the parties
hereto and their respective successors, assigns (including any direct or
indirect successor by purchase, merger, consolidation or otherwise to all or
substantially all of the business or assets of the Company), spouses, heirs and
personal and legal representatives. The Company shall require and cause any
successor (whether direct or indirect, and whether by purchase, merger,
consolidation or otherwise) to all, substantially all, or a substantial part, of
the business or assets of the Company, by written agreement in form and
substance satisfactory to Indemnitee, expressly to assume and agree to perform
this Agreement in the same manner and to the same extent that the Company would
be required to perform if no such succession had taken place. This Agreement
shall continue in effect regardless of whether Indemnitee continues to serve as
a director, officer, employee, agent or fiduciary (as applicable) of the Company
or of any other enterprise at the Company's request.

     13.  Expenses Incurred in Action Relating to Enforcement or Interpretation.
          ---------------------------------------------------------------------
In the event that any action is instituted by Indemnitee under this Agreement or
under any liability insurance policies maintained by the Company to enforce or
interpret any of the terms hereof or thereof, Indemnitee shall be entitled to be
indemnified for all Expenses incurred by Indemnitee with respect to such action
(including without limitation attorneys' fees), regardless of whether Indemnitee
is ultimately successful in such action, unless as a part of such action a court
having jurisdiction over such action makes a final judicial determination (as to
which all rights of appeal therefrom have been exhausted or lapsed) that each of
the material assertions made by Indemnitee as a basis for such action was not
made in good faith or was frivolous; provided, however, that until such final
judicial determination is made, Indemnitee shall be entitled under Section 3 to
receive payment of Expense Advances hereunder with respect to such action. In
the event of an action instituted by or in the name of the Company under this
Agreement to enforce or interpret any of the terms of this Agreement, Indemnitee
shall be entitled to be indemnified for all Expenses incurred by Indemnitee in
defense of such action (including without limitation costs and expenses incurred
with respect to Indemnitee's counterclaims and cross-claims made in such
action), unless as a part of such action a court having jurisdiction over such
action makes a final judicial determination (as to which all rights of appeal
therefrom have been exhausted or lapsed) that each of the material defenses
asserted by Indemnitee in such action was made in bad faith or was frivolous;
provided, however, that until such final judicial determination is made,
Indemnitee shall be entitled under Section 3 to receive payment of Expense
Advances hereunder with respect to such action.

     14.  Period of Limitations.  No legal action shall be brought and no cause
          ---------------------
of action shall be asserted by or in the right of the Company against
Indemnitee, Indemnitee's estate, spouse, heirs, executors or personal or legal
representatives after the expiration of two years from the date of accrual of
such cause of action, and any claim or cause of action of the Company shall be
extinguished and deemed released unless asserted by the timely filing of a legal
action within such two year period; provided, however, that if any shorter
                                    --------  -------
period of limitations is otherwise applicable to any such cause of action, such
shorter period shall govern.

                                      -9-
<PAGE>

     15.  Notice.  All notices, requests, demands and other communications under
          ------
this Agreement shall be in writing and shall be deemed duly given (i) if
delivered by hand and signed for by the party addressed, on the date of such
delivery, or (ii) if mailed by domestic certified or registered mail with
postage prepaid, on the third business day after the date postmarked. Addresses
for notice to either party are as shown on the signature page of this Agreement,
or as subsequently modified by written notice.

     16.  Consent to Jurisdiction.  The Company and Indemnitee each hereby
          -----------------------
irrevocably consent to the jurisdiction of the courts of the State of California
for all purposes in connection with any action or proceeding which arises out of
or relates to this Agreement and agree that any action instituted under this
Agreement shall be commenced, prosecuted and continued only in the state courts
of the State of California, which shall be the exclusive and only proper forum
for adjudicating such a claim.

     17.  Severability.  The provisions of this Agreement shall be severable in
          ------------
the event that any of the provisions hereof (including any provision within a
single section, paragraph or sentence) are held by a court of competent
jurisdiction to be invalid, void or otherwise unenforceable, and the remaining
provisions shall remain enforceable to the fullest extent permitted by law.
Furthermore, to the fullest extent possible, the provisions of this Agreement
(including without limitation each portion of this Agreement containing any
provision held to be invalid, void or otherwise unenforceable, that is not
itself invalid, void or unenforceable) shall be construed so as to give effect
to the intent manifested by the provision held invalid, illegal or
unenforceable.

     18.  Choice of Law.  This Agreement, and all rights, remedies, liabilities,
          -------------
powers and duties of the parties to this Agreement, shall be governed by and
construed in accordance with the laws of the State of California as applied to
contracts between California residents entered into and to be performed entirely
in the State of California without regard to principles of conflicts of laws.

     19.  Subrogation.  In the event of payment under this Agreement, the
          -----------
Company shall be subrogated to the extent of such payment to all of the rights
of recovery of Indemnitee, who shall execute all documents required and shall do
all acts that may be necessary to secure such rights and to enable the Company
effectively to bring suit to enforce such rights.

     20.  Amendment and Termination.  No amendment, modification, termination or
          -------------------------
cancellation of this Agreement shall be effective unless it is in writing signed
by both the parties hereto.  No waiver of any of the provisions of this
Agreement shall be deemed to be or shall constitute a waiver of any other
provisions hereof (whether or not similar), nor shall such waiver constitute a
continuing waiver.

     21.  Integration and Entire Agreement.  This Agreement sets forth the
          --------------------------------
entire understanding between the parties hereto and supersedes and merges all
previous written and oral negotiations, commitments, understandings and
agreements relating to the subject matter hereof between the parties hereto.

                                      -10-
<PAGE>

     22.  No Construction as Employment Agreement.  Nothing contained in this
          ---------------------------------------
Agreement shall be construed as giving Indemnitee any right to be retained in
the employ of the Company or any of its subsidiaries or affiliated entities.

                 [Remainder of Page Intentionally Left Blank]

                                      -11-
<PAGE>

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

SYNPLICITY, INC.

By:________________________________

Name:______________________________

Title:_____________________________

Address:  935 Stewart Drive
          Sunnyvale, CA 94086

                                      AGREED TO AND ACCEPTED
                                      INDEMNITEE:

                                      _______________________________________
                                      (signature)

                                      _______________________________________
                                      Name

                                      _______________________________________
                                      Address

                                      _______________________________________

                                      -12-

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