SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                   FORM 10-K/A

(Mark One)

|X|   Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange
      Act of 1934

      For the fiscal year ended September 30, 2000

                                            OR

|_|   Transition Report Pursuant to Section 13 or 15(d) of the Securities
      Exchange Act of 1934

      For the transition period __________ to __________.

                        Commission file number 000-29513

                              INSILICON CORPORATION
                              ---------------------
             (Exact name of registrant as specified in its charter)

          Delaware                                               77-0526155
          --------                                               ----------
(State or other jurisdiction of                              (I.R.S.  Employer
incorporation or organization)                               Identification No.)

               411 East Plumeria Drive, San Jose, California 95134
               ---------------------------------------------------
          (Address of principal executive offices, including zip code)

                                 (408) 894-1900
                                 --------------
              (Registrant's telephone number, including area code)

           Securities registered pursuant to Section 12(b) of the Act:

                                      None

           Securities registered pursuant to Section 12(g) of the Act:

                          Common Stock, par value $.001
                          -----------------------------
                              (Title of each Class)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. YES |X| NO |_|

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. |_|

The aggregate market value of the voting stock held by non-affiliates of the
registrant as of November 30, 2000, was $21,784,588 based upon the last reported
sales price of the common stock on the Nasdaq National Market.

The number of shares of the registrant's Common Stock outstanding as of November
30, 2000 was 14,188,624.

                       Documents Incorporated by Reference

Portions of the registrant's definitive proxy statement to be filed pursuant to
Regulation 14A in connection with the 2001 annual meeting of its stockholders
are incorporated by reference into Part III of this Form 10-K.
<PAGE>

                                   SIGNATURES

      Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                      INSILICON CORPORATION


                                      /s/ William E.  Meyer
                                      ------------------------------------
                                      William E. Meyer
                                      Principal Financial and Accounting Officer
                                      Date: December 29, 2000