U S VENTURE PARTNERS IV L P
SC 13G/A, 2000-02-14
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON D.C. 20549

                                  SCHEDULE 13G
                                 (Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS  FILED PURSUANT TO RULES 13d-1 (b), (c)
AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(b)

                               (Amendment No. 1)*

                            Artisan Components, Inc.
                            ------------------------
                                (Name of Issuer)

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

                                    042923102
                                 --------------
                                 (CUSIP Number)

                               December 31, 1999
             -------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

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

         [ ] Rule 13d-1(b)

         [ ] Rule 13d-1(c)

         [X] 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).

                         (Continued on following pages)

                               Page 1 of 13 Pages
<PAGE>
CUSIP NO. 042923102                                           PAGE 2 OF 13 PAGES
- -------------------                                           ------------------

1  NAMES OF REPORTING PERSONS
   S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

   U.S. Venture Partners IV, L.P. ("USVP IV")
   Tax ID Number:   94-3193188
   -----------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [ ]
                                                                      (b) [X]
   -----------------------------------------------------------------------------
3  SEC USE ONLY

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

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

                    798,972 shares,  except that Presidio  Management  Group IV,
                    L.P.  ("PMG  IV"),  the  general  partner of USVP IV, may be
                    deemed  to have  sole  voting  power  with  respect  to such
                    shares, and Bowes,  Federman,  Krausz and Young, the general
                    partners of PMG IV may be deemed to have shared voting power
                    with respect to such shares.
    NUMBER OF       ------------------------------------------------------------
     SHARES      6  SHARED VOTING POWER
   BENEFICIALLY
    OWNED BY        See Response to row 5.
      EACH          ------------------------------------------------------------
    REPORTING    7  SOLE DISPOSITIVE POWER
     PERSON
      WITH          798,972 shares,  except that Presidio  Management  Group IV,
                    L.P.  ("PMG  IV"),  the  general  partner of USVP IV, may be
                    deemed to have sole  dipositive  power with  respect to such
                    shares, and Bowes,  Federman,  Krausz and Young, the general
                    partners of PMG IV may be deemed to have shared  dispositive
                    power with respect to such shares.
                    ------------------------------------------------------------
                 8  SHARED DISPOSITIVE POWER

                    See Response to row 7.
                    ------------------------------------------------------------

9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   798,972
   ----------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


   -----------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

   5.7%
   -----------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

   PN
   -----------------------------------------------------------------------------
                     *See Instructions Before Filling Out!
<PAGE>
CUSIP NO. 042923102                                           PAGE 3 OF 13 PAGES
- -------------------                                           ------------------

1  NAMES OF REPORTING PERSONS
   S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

   Second Ventures II, L.P. ("SV II")
   Tax ID Number:   94-3200353
   -----------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [ ]
                                                                      (b) [X]
   -----------------------------------------------------------------------------
3  SEC USE ONLY

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

   Cayman Islands
   -----------------------------------------------------------------------------
                 5  SOLE VOTING POWER

                    97,650  shares,  except that Presidio  Management  Group IV,
                    L.P. ("PMG IV"), the general partner of SV II, may be deemed
                    to have sole voting power with  respect to such shares,  and
                    Bowes,  Federman,  Krausz and Young, the general partners of
                    PMG IV may be  deemed  to  have  shared  voting  power  with
                    respect to such shares.
    NUMBER OF       ------------------------------------------------------------
     SHARES      6  SHARED VOTING POWER
   BENEFICIALLY
    OWNED BY        See Response to row 5.
      EACH          ------------------------------------------------------------
    REPORTING    7  SOLE DISPOSITIVE POWER
     PERSON
      WITH          97,650  shares,  except that Presidio  Management  Group IV,
                    L.P. ("PMG IV"), the general partner of SV II, may be deemed
                    to have sole  dipositive  power with respect to such shares,
                    and Bowes, Federman,  Krausz and Young, the general partners
                    of PMG IV may be deemed  to have  shared  dispositive  power
                    with respect to such shares.
                    ------------------------------------------------------------
                 8  SHARED DISPOSITIVE POWER

                    See Response to row 7.
                    ------------------------------------------------------------

9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   97,650
   ----------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


   -----------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

   0.7%
   -----------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

   PN
   -----------------------------------------------------------------------------
                     *See Instructions Before Filling Out!
<PAGE>
CUSIP NO. 042923102                                           PAGE 4 OF 13 PAGES
- -------------------                                           ------------------

1  NAMES OF REPORTING PERSONS
   S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

   USVP Entrepreneur Partners II, L.P. ("UEP II")
   Tax ID Number:   94-3203198
   -----------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [ ]
                                                                      (b) [X]
   -----------------------------------------------------------------------------
3  SEC USE ONLY

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

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

                    43,328 shares,  except that Presidio  Management  Group IV,
                    L.P.  ("PMG  IV"),  the  general  partner of UEP II, may be
                    deemed  to have  sole  voting  power  with  respect  to such
                    shares, and Bowes,  Federman,  Krausz and Young, the general
                    partners of PMG IV may be deemed to have shared voting power
                    with respect to such shares.

    NUMBER OF       ------------------------------------------------------------
     SHARES      6  SHARED VOTING POWER
   BENEFICIALLY
    OWNED BY        See Response to row 5.
      EACH          ------------------------------------------------------------
    REPORTING    7  SOLE DISPOSITIVE POWER
     PERSON
      WITH          43,328  shares,  except that Presidio  Management  Group IV,
                    L.P.  ("PMG  IV"),  the  general  partner of UEP II, may be
                    deemed to have sole  dipositive  power with  respect to such
                    shares, and Bowes,  Federman,  Krausz and Young, the general
                    partners of PMG IV may be deemed to have shared  dispositive
                    power with respect to such shares.
                    ------------------------------------------------------------
                 8  SHARED DISPOSITIVE POWER

                    See Response to row 7.
                    ------------------------------------------------------------

9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   43,328
   ----------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


   -----------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

   0.3%
   -----------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

   PN
   -----------------------------------------------------------------------------
                     *See Instructions Before Filling Out!
<PAGE>
CUSIP NO. 042923102                                           PAGE 5 OF 13 PAGES
- -------------------                                           ------------------

1  NAMES OF REPORTING PERSONS
   S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

   Presidio management Group IV, L.P. ("PMG IV")
   Tax ID Number:   94-3193187
   -----------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [ ]
                                                                      (b) [X]
   -----------------------------------------------------------------------------
3  SEC USE ONLY

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

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

                    939,950  shares,  of which 798,972 are shares directly owned
                    by USVP  IV,  97,650  are  shares  directly  owned  by SV II
                    and43,328 are shares directly owned by UEP II. PMG IV is the
                    general  partner  of USVP IV,  SV II and UEP II,  and may be
                    deemed  to have  sole  voting  power  with  respect  to such
                    shares, and Bowes,  Federman,  Krausz and Young, the general
                    partners of PMG IV may be deemed to have shared voting power
                    with respect to such shares.

    NUMBER OF       ------------------------------------------------------------
     SHARES      6  SHARED VOTING POWER
   BENEFICIALLY
    OWNED BY        See Response to row 5.
      EACH          ------------------------------------------------------------
    REPORTING    7  SOLE DISPOSITIVE POWER
     PERSON
      WITH          939,950  shares,  of which 798,972 are shares directly owned
                    by USVP IV,  97,650 are shares  directly  owned by SV II and
                    43,328  are shares  directly  owned by UEP II. PMG IV is the
                    general  partner  of USVP IV,  SV II and UEP II,  and may be
                    deemed to have sole  dispositive  power with respect to such
                    shares, and Bowes,  Federman,  Krausz and Young, the general
                    partners of PMG IV may be deemed to have shared  dispositive
                    power with respect to such shares.
                    ------------------------------------------------------------
                 8  SHARED DISPOSITIVE POWER

                    See Response to row 7.
                    ------------------------------------------------------------

9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   939,950
   ----------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


   -----------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

   6.7%
   -----------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

   PN
   -----------------------------------------------------------------------------
                     *See Instructions Before Filling Out!

<PAGE>
CUSIP NO. 042923102                                           PAGE 6 OF 13 PAGES
- -------------------                                           ------------------

1  NAMES OF REPORTING PERSONS
   S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

   William K. Bowes, Jr. ("Bowes")
   Tax ID Number:
   -----------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [ ]
                                                                      (b) [X]
   -----------------------------------------------------------------------------
3  SEC USE ONLY

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

   U.S. Citizen
   -----------------------------------------------------------------------------
                 5  SOLE VOTING POWER

                    30,302 shares.
    NUMBER OF       ------------------------------------------------------------
     SHARES      6  SHARED VOTING POWER
   BENEFICIALLY
    OWNED BY        939,950 shares, of which 798,972 are  shares  directly owned
      EACH          by USVP IV, 97,650 are  shares  directly  owned by SV II and
    REPORTING       43,328 are  shares  directly  owned  by  UEP II.  Bowes is a
     PERSON         general  partner of PMG IV, the general  partner of USVP IV,
      WITH          SV II and UEP II,  and may be deemed to have  shared  voting
                    power with respect to such shares.
                    ------------------------------------------------------------
                 7  SOLE DISPOSITIVE POWER

                    30,302 shares.
                    ------------------------------------------------------------
                 8  SHARED DISPOSITIVE POWER

                    939,950  shares,  of which 798,972 are shares directly owned
                    by USVP IV,  97,650 are shares  directly  owned by SV II and
                    43,328  are  shares  directly  owned  by UEP II.  Bowes is a
                    general  partner of PMG IV, the general  partner of USVP IV,
                    SV II  and  UEP  II,  and  may  be  deemed  to  have  shared
                    dispositive power with respect to such shares.
                    ------------------------------------------------------------

9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   970,252
   ----------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


   -----------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

   7.0%
   -----------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

   IN
   -----------------------------------------------------------------------------
                     *See Instructions Before Filling Out!

<PAGE>
CUSIP NO. 042923102                                           PAGE 7 OF 13 PAGES
- -------------------                                           ------------------

1  NAMES OF REPORTING PERSONS
   S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

   Irwin Federman ("Federman")
   Tax ID Number:
   -----------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [ ]
                                                                      (b) [X]
   -----------------------------------------------------------------------------
3  SEC USE ONLY

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

   U.S. Citizen
   -----------------------------------------------------------------------------
                 5  SOLE VOTING POWER

                    0 shares.
    NUMBER OF       ------------------------------------------------------------
     SHARES      6  SHARED VOTING POWER
   BENEFICIALLY
    OWNED BY        939,950 shares, of which 798,972 are  shares  directly owned
      EACH          by USVP IV, 97,650 are  shares  directly  owned by SV II and
    REPORTING       43,328 are shares directly owned  by  UEP II.  Federman is a
     PERSON         general  partner of PMG IV, the general  partner of USVP IV,
      WITH          SV II and UEP II,  and may be deemed to have  shared  voting
                    power with respect to such shares.
                    ------------------------------------------------------------
                 7  SOLE DISPOSITIVE POWER

                    0 shares.
                    ------------------------------------------------------------
                 8  SHARED DISPOSITIVE POWER

                    939,950  shares,  of which 798,972 are shares directly owned
                    by USVP IV,  97,650 are shares  directly  owned by SV II and
                    43,328  are shares directly owned  by UEP II.  Federman is a
                    general  partner of PMG IV, the general  partner of USVP IV,
                    SV II  and  UEP  II,  and  may  be  deemed  to  have  shared
                    dispositive power with respect to such shares.
                    ------------------------------------------------------------

9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   939,950
   ----------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


   -----------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

   6.7%
   -----------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

   IN
   -----------------------------------------------------------------------------
                     *See Instructions Before Filling Out!
<PAGE>
CUSIP NO. 042923102                                           PAGE 8 OF 13 PAGES
- -------------------                                           ------------------

1  NAMES OF REPORTING PERSONS
   S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

   Steven M. Krausz ("Krausz")
   Tax ID Number:
   -----------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [ ]
                                                                      (b) [X]
   -----------------------------------------------------------------------------
3  SEC USE ONLY

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

   U.S. Citizen
   -----------------------------------------------------------------------------
                 5  SOLE VOTING POWER

                    0 shares.
    NUMBER OF       ------------------------------------------------------------
     SHARES      6  SHARED VOTING POWER
   BENEFICIALLY
    OWNED BY        939,950 shares, of which 798,972 are  shares  directly owned
      EACH          by USVP IV, 97,650 are  shares  directly  owned by SV II and
    REPORTING       43,328 are  shares  directly  owned  by UEP II.  Krausz is a
     PERSON         general  partner of PMG IV, the general  partner of USVP IV,
      WITH          SV II and UEP II,  and may be deemed to have  shared  voting
                    power with respect to such shares.
                    ------------------------------------------------------------
                 7  SOLE DISPOSITIVE POWER

                    0 shares.
                    ------------------------------------------------------------
                 8  SHARED DISPOSITIVE POWER

                    939,950  shares,  of which 798,972 are shares directly owned
                    by USVP IV,  97,650 are shares  directly  owned by SV II and
                    43,328  are  shares  directly owned  by UEP II.  Krausz is a
                    general  partner of PMG IV, the general  partner of USVP IV,
                    SV II  and  UEP  II,  and  may  be  deemed  to  have  shared
                    dispositive power with respect to such shares.
                    ------------------------------------------------------------

9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   939,950
   ----------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


   -----------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

   6.7%
   -----------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

   IN
   -----------------------------------------------------------------------------
                     *See Instructions Before Filling Out!
<PAGE>
CUSIP NO. 042923102                                           PAGE 9 OF 13 PAGES
- -------------------                                           ------------------

1  NAMES OF REPORTING PERSONS
   S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

   Lucio Lanza ("Lanza")
   Tax ID Number:
   -----------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [ ]
                                                                      (b) [X]
   -----------------------------------------------------------------------------
3  SEC USE ONLY

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

   U.S. Citizen
   -----------------------------------------------------------------------------
                 5  SOLE VOTING POWER

                    27,330 shares.
    NUMBER OF       ------------------------------------------------------------
     SHARES      6  SHARED VOTING POWER
   BENEFICIALLY
    OWNED BY        939,950 shares, of which 798,972 are  shares  directly owned
      EACH          by USVP IV, 97,650 are  shares  directly  owned by SV II and
    REPORTING       43,328 are  shares  directly  owned  by  UEP II. Lanza is an
     PERSON         affiliate of PMG IV, the  general  partner of USVP IV, SV II
      WITH          and UEP II, and may be deemed to have  shared  voting  power
                    with respect to such shares.
                    ------------------------------------------------------------
                 7  SOLE DISPOSITIVE POWER

                    27,330 shares.
                    ------------------------------------------------------------
                 8  SHARED DISPOSITIVE POWER

                    939,950  shares,  of which 798,972 are shares directly owned
                    by USVP IV,  97,650 are shares  directly  owned by SV II and
                    43,328  are  shares  directly owned  by UEP II.  Lanza is an
                    affiliate of PMG IV, the general  partner of USVP IV, SV II
                    and UEP II, and  may be  deemed to have  shared  dispositive
                    power with respect to such shares.
                    ------------------------------------------------------------

9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   967,280
   ----------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


   -----------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

   6.9%
   -----------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

   IN
   -----------------------------------------------------------------------------
                     *See Instructions Before Filling Out!

<PAGE>
                                                             Page 10 of 13 Pages
1  NAMES OF REPORTING PERSONS
   S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

   Philip M. Young ("Young")
   Tax ID Number:
   -----------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                  (a) [ ]
                                                                      (b) [X]
   -----------------------------------------------------------------------------
3  SEC USE ONLY

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

   U.S. Citizen
   -----------------------------------------------------------------------------
                 5  SOLE VOTING POWER

                    9,082 shares.
    NUMBER OF       ------------------------------------------------------------
     SHARES      6  SHARED VOTING POWER
   BENEFICIALLY
    OWNED BY        939,950 shares, of which 798,972 are  shares  directly owned
      EACH          by USVP IV, 97,650 are  shares  directly  owned by SV II and
    REPORTING       43,328 are  shares  directly  owned  by  UEP II.  Young is a
     PERSON         general  partner of PMG IV, the general  partner of USVP IV,
      WITH          SV II and UEP II,  and may be deemed to have  shared  voting
                    power with respect to such shares.
                    ------------------------------------------------------------
                 7  SOLE DISPOSITIVE POWER

                    9,082 shares.
                    ------------------------------------------------------------
                 8  SHARED DISPOSITIVE POWER

                    939,950  shares,  of which 798,972 are shares directly owned
                    by USVP IV,  97,650 are shares  directly  owned by SV II and
                    43,328  are  shares  directly  owned  by UEP II.  Young is a
                    general  partner of PMG IV, the general  partner of USVP IV,
                    SV II  and  UEP  II,  and  may  be  deemed  to  have  shared
                    dispositive power with respect to such shares.
                    ------------------------------------------------------------

9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   949,032
   ----------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


   -----------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

   6.8%
   -----------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

   IN
   -----------------------------------------------------------------------------
                     *See Instructions Before Filling Out!
<PAGE>
                                                             Page 11 of 13 Pages

          This statement  amends and restates the Statement on 13G filed by U.S.
          Venture  Partners IV, L.P. ("USVP IV"),  Second Ventures II, L.P. ("SV
          II"),  USVP  Entrepreneur  Partners  II,  L.P.  ("UEP  II"),  Presidio
          Management Group IV, L.P. ("PMG IV"), William K. Bowes, Jr. ("Bowes"),
          Irwin Federman ("Federman"),  Steven M. Krausz ("Krausz"), Lucio Lanza
          ("Lanza"),  and Philip M. Young ("Young").  The foregoing entities and
          individuals are collectively referred to as the "Reporting Persons".


ITEM 4.   OWNERSHIP:

          The following  information with respect to the ownership of the Common
          Stock of the issuer by the persons  filing this  Statement is provided
          as of December 31, 1999:

               (a)  Amount beneficially owned:

                    See Row 9 of cover page for each Reporting Person.

               (b)  Percent of Class:

                    See Row 11 of cover page for each Reporting Person.

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

                    (i)   Sole power to vote or to direct the vote:

                          See Row 5 of cover page for each Reporting Person.

                    (ii)  Shared power to vote or to direct the vote:

                          See Row 6 of cover page for each Reporting Person.

                    (iii) Sole power to dispose or to direct the disposition of:

                          See Row 7 of cover page for each Reporting Person.

                    (iv)  Shared  power to dispose  or to direct the disposition
                          of:

                          See Row 8 of cover page for each Reporting Person.
<PAGE>
                                                             Page 12 of 13 Pages
                                   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: January 31, 2000


U.S. Venture Partners IV, L.P.          ----------------------------------------
By Presidio Management Group IV, L.P.   Signature
Its General Partner
                                        Michael P. Maher
                                        Chief Financial Officer/Attorney-In-Fact


Second Ventures II, L.P.                ----------------------------------------
By Presidio Management Group IV, L.P.   Signature
Its General Partner
                                        Michael P. Maher
                                        Chief Financial Officer/Attorney-In-Fact


USVP Entrepreneur Partners II, L.P.     ----------------------------------------
By Presidio Management Group IV, L.P.   Signature
Its General Partner
                                        Michael P. Maher
                                        Chief Financial Officer/Attorney-In-Fact


Presidio Management Group IV, L.P.      ----------------------------------------
A Delaware Limited Partnership          Signature

                                        Michael P. Maher
                                        Chief Financial Officer/Attorney-In-Fact


William K. Bowes, Jr.                   ----------------------------------------
                                        Michael P. Maher
                                        Attorney-In-Fact


Irwin Federman                          ----------------------------------------
                                        Michael P. Maher
                                        Attorney-In-Fact
<PAGE>
                                                             Page 13 of 13 Pages


Steven M. Krausz                        ----------------------------------------
                                        Michael P. Maher
                                        Attorney-In-Fact


Lucio Lanza                             ----------------------------------------
                                        Michael P. Maher
                                        Attorney-In-Fact


Philip M. Young                         ----------------------------------------
                                        Michael P. Maher
                                        Attorney-In-Fact


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