<SUBMISSION>
<ACCESSION-NUMBER>0000950135-01-000718
<TYPE>SC 13G
<PUBLIC-DOCUMENT-COUNT>2
<FILING-DATE>20010214
<GROUP-MEMBERS>HIGH ROCK ASSET MANAGEMENT LLC
<GROUP-MEMBERS>HIGH ROCK CAPITAL LLC
<SUBJECT-COMPANY>
<COMPANY-DATA>
<CONFORMED-NAME>ACTEL CORP
<CIK>0000907687
<ASSIGNED-SIC>3674
<IRS-NUMBER>770097724
<STATE-OF-INCORPORATION>CA
<FISCAL-YEAR-END>0102
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>SC 13G
<ACT>34
<FILE-NUMBER>005-44993
<FILM-NUMBER>1543819
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>955 EAST ARQUES AVE
<CITY>SUNNYVALE
<STATE>CA
<ZIP>94086
<PHONE>4087391010
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>955 EAST ARQUES AVE
<STREET2>955 EAST ARQUES AVE
<CITY>SUNNYVALE
<STATE>CA
<ZIP>94086
</MAIL-ADDRESS>
</SUBJECT-COMPANY>
<FILED-BY>
<COMPANY-DATA>
<CONFORMED-NAME>HIGH ROCK CAPITAL LLC
<CIK>0001098763
<ASSIGNED-SIC>
<IRS-NUMBER>043397165
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>SC 13G
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>28 STATE STREET
<STREET2>18TH FLOOR
<CITY>BOSTON
<STATE>MA
<ZIP>02109
<PHONE>6177475800
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>28 STATE STREET
<STREET2>18TH FLOOR
<CITY>HOUSTON
<STATE>TX
<ZIP>02109
</MAIL-ADDRESS>
</FILED-BY>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>b38335acsc13g.txt
<DESCRIPTION>ACTEL CORPORATION
<TEXT>

<PAGE>   1
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. )*


                                Actel Corporation
--------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    004934105
                       -----------------------------------
                                 (CUSIP Number)


                                December 31, 2000
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

     [X]  Rule 13d-1(b)
     [ ]  Rule 13d-1(c)
     [ ]  Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


<PAGE>   2


-------------------                                         --------------------
CUSIP No. 004934105               SCHEDULE 13G
--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     High Rock Capital LLC
     04-3397165
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (a) [ ]
                                                                         (b) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                         5    SOLE VOTING POWER

                              910,700
  NUMBER OF              -------------------------------------------------------
   SHARES                6    SHARED VOTING POWER
BENEFICIALLY
  OWNED BY                    -0-
    EACH                 -------------------------------------------------------
  REPORTING              7    SOLE DISPOSITIVE POWER
   PERSON
    WITH                      1,130,800
                         -------------------------------------------------------
                         8    SHARED DISPOSITIVE POWER

                              -0-
--------------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,256,000 shares (see Item 4(a) of attached Schedule)
--------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
--------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     5.2%
--------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*

     IA
================================================================================


<PAGE>   3


-------------------                                         --------------------
CUSIP No. 004934105               SCHEDULE 13G
--------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

     High Rock Asset Management LLC
     04-3402072
--------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                   (a) [ ]
                                                                         (b) [ ]
--------------------------------------------------------------------------------
3    SEC USE ONLY

--------------------------------------------------------------------------------
4    CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware
--------------------------------------------------------------------------------
                         5    SOLE VOTING POWER

                              125,200
  NUMBER OF              -------------------------------------------------------
   SHARES                6    SHARED VOTING POWER
BENEFICIALLY
  OWNED BY                    -0-
    EACH                 -------------------------------------------------------
  REPORTING              7    SOLE DISPOSITIVE POWER
   PERSON
    WITH                      125,200
                         -------------------------------------------------------
                         8    SHARED DISPOSITIVE POWER

                              -0-
--------------------------------------------------------------------------------
9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     1,256,000 shares (see Item 4(a) of attached Schedule)
--------------------------------------------------------------------------------
10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                             [ ]
--------------------------------------------------------------------------------
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     5.2%
--------------------------------------------------------------------------------
12   TYPE OF REPORTING PERSON*

     IA
================================================================================


<PAGE>   4


                                  SCHEDULE 13G

Item 1(a).     NAME OF ISSUER:  Actel Corporation

Item 1(b).     ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
                    955 East Arques Ave
                    Sunnyvale, CA 94086

Item 2(a).     NAMES OF PERSONS FILING: High Rock Capital LLC ("HRC") and High
               Rock Asset Management LLC ("HRAM")

Item 2(b).     ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: The
               address of the principal business office of HRC and HRAM is 28
               State Street, 18th Floor, Boston, MA 02109.

Item 2(c).     CITIZENSHIP: Each of HRC and HRAM is a limited liability company
               organized under the laws of the state of Delaware.

Item 2(d).     TITLE OF CLASS OF SECURITIES: Common Stock

Item 2(e).     CUSIP NUMBER:     004934105

Item 3.        IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b), OR
               13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:
               (a) [ ] Broker or dealer registered under Section 15 of the
                       Securities Exchange Act of 1934 (the "Act);

               (b) [ ] Bank as defined in Section 3(a)(6) of the Act;

               (c) [ ] Insurance company as defined in Section 3(a)(19) of the
                       Act;

               (d) [ ] Investment company registered under Section 8 of the
                       Investment Company Act of 1940;

               (e) [X] An investment adviser in accordance with Rule
                       13d-1(b)(1)(ii)(E);

               (f) [ ] An employee benefit plan or endowment fund in accordance
                       with Rule 13d-1(b)(1)(ii)(F);

               (g) [ ] A parent holding company or control person in accordance
                       with Rule 13d-1(b)(1)(ii)(G);

               (h) [ ] A savings association as defined in Section 3(b) of the
                       Federal Deposit Insurance Act;

               (i) [ ] A church plan that is excluded from the definition of an
                       investment company under Section 3(c)(14) of the
                       Investment Company Act;


<PAGE>   5


               (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).


               If this statement is filed pursuant to Rule 13d-1(c), check this
               box. [ ]


Item 4.   OWNERSHIP.

          (a)  Amount Beneficially Owned: Each of HRC and HRAM may be deemed to
               beneficially own 1,256,000 shares as of December 31, 2000.

               HRC was the record owner of 1,130,800 shares as of December 31,
               2000. HRAM was the record owner of 125,200 shares as of December
               31, 2000. (The shares held of record by HRC and HRAM are referred
               to collectively herein as the "Record Shares.") By virtue of
               their relationship as affiliated limited liability companies with
               the same individual as President, each of HRC and HRAM may be
               deemed to beneficially own all of the Record Shares. Hence, each
               of HRC and HRAM may be deemed to beneficially own 1,256,000
               shares as of December 31, 2000.

          (b)  Percent of Class: HRC: 4.7%; HRAM: 0.5%

          (c)  Number of shares as to which such person has:

               (i)   sole power to vote or to direct the vote:
                         HRC: 910,700 shares
                         HRAM: 125,200 shares

               (ii)  shared power to vote or to direct the vote:
                         HRC: 0 shares
                         HRAM: 0 shares

               (iii) sole power to dispose or to direct the disposition of:
                         HRC: 1,130,800 shares
                         HRAM: 125,200 shares

               (iv)  shared power to dispose or to direct the disposition of:
                         HRC: 0 shares
                         HRAM: 0 shares

          Each of HRC and HRAM expressly disclaims beneficial ownership of any
          shares of Actel Corporation, except, in the case of HRC, for the
          1,130,800 shares that it holds of record and, in the case of HRAM, for
          the 125,200 shares that it holds of record.


<PAGE>   6


Item 5.   OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
               Not applicable.

Item 6.   OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.
               Not applicable.


Item 7.   IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
          SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.
               Not applicable.

Item 8.   IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
               Not applicable.

Item 9.   NOTICE OF DISSOLUTION OF GROUP.
               Not applicable.

Item 10.  CERTIFICATIONS.
               Not applicable. This statement on Schedule 13G is not filed
               pursuant to Rule 13d-1(b).


<PAGE>   7


                                   SIGNATURES

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated: February 12, 2001


HIGH ROCK CAPITAL LLC

By:  High Rock Capital LLC


By:  /s/ David L. Diamond
     ---------------------------------
     David L. Diamond,
     President


HIGH ROCK ASSET MANAGEMENT LLC


By:  /s/ David L. Diamond
     ---------------------------------
     David L. Diamond,
     President
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>b38335acex99-1.txt
<DESCRIPTION>AGREEMENT
<TEXT>

<PAGE>   1

                                                                       EXHIBIT 1

                                   AGREEMENT


     Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, the
undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the ownership by each of
the undersigned of shares of Common Stock of Actel Corporation and that this
statement is filed on behalf of each of them.

     This agreement may be executed in any number of counterparts, each of which
shall be deemed an original.

     EXECUTED this 12th day of February, 2001.



HIGH ROCK CAPITAL LLC

By:  High Rock Capital LLC


By:  /s/ David L. Diamond
     ---------------------------------
     David L. Diamond,
     President

HIGH ROCK ASSET MANAGEMENT LLC


By:  High Rock Asset Management LLC


By:  /s/ David L. Diamond
     ---------------------------------
     David L. Diamond,
     President
</TEXT>
</DOCUMENT>
</SUBMISSION>
