MAYFIELD VII
SC 13G/A, 1998-02-17
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<PAGE>   1
                         [LATHAM & WATKINS LETTERHEAD]



                               February 17, 1998




BY EDGAR


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

Re:  Amendment No. 2 to Schedule 13G with respect to Digital Generation
     Systems, Inc.


Ladies and Gentlemen:

      On behalf of Mayfield VII, a California Limited Partnership, and pursuant
to the electronic filing requirements of the Securities and Exchange Commission,
we file the enclosed Amendment No. 2 to Schedule 13G, pursuant to Rule 13d-2(b),
relating to the Common Stock par value $.001 per share, of Digital Generation
Systems, Inc. (the "Company"). By copy of this letter, a conformed copy of the
enclosed Amendment No. 2 to Schedule 13G is being transmitted to the Company and
to NASDAQ.

      Should you have questions regarding this filing, please contact the 
undersigned at (415) 395-8268.


                                       Very truly yours,


                                       /s/ RICHARD G. CHISHOLM
                                       ------------------------------
                                       Richard G. Chisholm
                                       LATHAM & WATKINS

Enclosure

cc:  Digital Generation Systems, Inc.
     NASDAQ
<PAGE>   2
                       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) AND (c) AND AMENDMENTS THERETO FILED
                              PURSUANT TO 13d-2(b)
                               (Amendment No. 2)(1)


                         Digital Generation Systems, Inc
                                (Name of Issuer)


                    Common Stock, par value $.001 per share
                         (Title of Class of Securities)


                                   2153921100
                                 (CUSIP Number)


(1)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>   3
CUSIP NO. 2153921100                     13G           PAGE  2    OF  17  PAGES
         ---------------------                              -----    -----      

  (1)     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
          MAYFIELD VII, A CALIFORNIA LIMITED PARTNERSHIP
          94-3167809
          ---------------------------------------------------------------------

  (2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a)   [   ]
                                                                    (b)   [ X ]

          --------------------------------------------------------------------- 

  (3)     SEC USE ONLY

          ---------------------------------------------------------------------

  (4)     CITIZENSHIP OR PLACE OF ORGANIZATION                      
          CALIFORNIA
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    -0-        
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     973,301
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   -0-
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               973,301
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         
          973,301          
          ---------------------------------------------------------------------

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          8.0%         
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON
          PN
          ---------------------------------------------------------------------



<PAGE>   4
CUSIP NO. 2153921100                     13G           PAGE  3    OF  17  PAGES
         ---------------------                              -----    -----      

  (1)     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
          MAYFIELD VII MANAGEMENT PARTNERS, A CALIFORNIA LIMITED PARTNERSHIP
          94-3167811
          ---------------------------------------------------------------------

  (2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP          (a)   [   ]
                                                                    (b)   [ X ]

          --------------------------------------------------------------------- 

  (3)     SEC USE ONLY

          ---------------------------------------------------------------------

  (4)     CITIZENSHIP OR PLACE OF ORGANIZATION                      
          CALIFORNIA
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    -0-        
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     973,301
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   -0-
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               973,301
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         
          973,301          
          ---------------------------------------------------------------------

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          8.0%         
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON
          PN
          ---------------------------------------------------------------------



<PAGE>   5
 
CUSIP NO. 2153921100                   13G               PAGE   4  OF   17 PAGES
          --------------------                                -----   -----

  (1)     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

          MAYFIELD ASSOCIATES FUND II, A CALIFORNIA LIMITED PARTNERSHIP
          94-3191510
          ---------------------------------------------------------------------

  (2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)   [   ]
                                                                    (b)   [ X ]

          --------------------------------------------------------------------- 

  (3)     SEC USE ONLY

          ---------------------------------------------------------------------

  (4)     CITIZENSHIP OR PLACE OF ORGANIZATION

          CALIFORNIA
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER
  NUMBER OF                          -0-
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER
  OWNED BY                           -0-
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER
 PERSON WITH                         -0-
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER
                                     -0-
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         

               0
          ---------------------------------------------------------------------

 (10)     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
          SHARES                                                          [   ]

          ---------------------------------------------------------------------

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

               0%
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON

               PN
          ---------------------------------------------------------------------

<PAGE>   6
CUSIP NO. 2153921100                     13G           PAGE  5    OF  17  PAGES
         ---------------------                              -----    -----      

  (1)     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
          YOGEN K. DALAL
          SOCIAL SECURITY 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.
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    1,857        
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     973,301
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   1,857
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               973,301
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         
          975,158          
          ---------------------------------------------------------------------

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          8.1%         
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON
          IN
          ---------------------------------------------------------------------




<PAGE>   7
CUSIP NO. 2153921100                     13G           PAGE  6    OF  17  PAGES
         ---------------------                              -----    -----      

  (1)     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
          F. GIBSON MYERS, JR.
          SOCIAL SECURITY 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.
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    1,857        
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     973,301
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   1,857
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               973,301
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         
          975,158          
          ---------------------------------------------------------------------

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          8.1%         
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON
          IN
          ---------------------------------------------------------------------




<PAGE>   8
CUSIP NO. 2153921100                     13G           PAGE  7    OF  17  PAGES
         ---------------------                              -----    -----      

  (1)     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
          KEVIN A. FONG
          SOCIAL SECURITY 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.
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    1,000
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     973,301
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   1,000
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               973,301
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         
          974,301          
          ---------------------------------------------------------------------

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          8.1%         
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON
          IN
          ---------------------------------------------------------------------
<PAGE>   9
CUSIP NO. 2153921100                     13G           PAGE   8   OF  17  PAGES
         ---------------------                              -----    -----      

  (1)     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
          WILLIAM D. UNGER
          SOCIAL SECURITY 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.
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    0
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     973,301
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   0
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               973,301
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         
          973,301          
          ---------------------------------------------------------------------

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          8.0%         
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON
          IN
          ---------------------------------------------------------------------
<PAGE>   10
CUSIP NO. 2153921100                     13G           PAGE  9    OF  17  PAGES
         ---------------------                              -----    -----      

  (1)     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
          WENDELL G. VAN AUKEN
          SOCIAL SECURITY 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.
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    1,857
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     973,301
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   1,857
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               973,301
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         
          975,158          
          ---------------------------------------------------------------------

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          8.1%         
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON
          IN
          ---------------------------------------------------------------------

<PAGE>   11
CUSIP NO. 2153921100                     13G           PAGE  10   OF  17  PAGES
         ---------------------                              -----    -----      

  (1)     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
          MICHAEL J. LEVINTHAL
          SOCIAL SECURITY 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.
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    0
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     973,301
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   0
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               973,301
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         
          973,301          
          ---------------------------------------------------------------------

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          8.0%         
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON
          IN
          ---------------------------------------------------------------------


<PAGE>   12
CUSIP NO. 2153921100                     13G           PAGE  11   OF  17  PAGES
         ---------------------                              -----    -----      

  (1)     NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
          A. GRANT HEIDRICH, III
          SOCIAL SECURITY 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.
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    1,857
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     973,301
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   1,857
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               973,301
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         
          975,158  
          ---------------------------------------------------------------------

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
          8.1%         
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON
          IN
          ---------------------------------------------------------------------



<PAGE>   13
ITEM 1.

        (a)    NAME OF ISSUER:

               Digital Generation Systems, Inc.

        (b)    ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

               875 Battery Street
               San Francisco, CA 94105

ITEM 2.

        (a)    NAME OF PERSONS FILING:

               Mayfield VII, a California Limited Partnership
               Mayfield VII Management Partners, a California Limited 
               Partnership
               Mayfield Associates II
               Yogen K. Dalal
               Kevin A. Fong
               Wendell G. Van Auken
               A. Grant Heidrich, III
               F. Gibson Myers, Jr.
               William D. Unger
               Michael J. Levinthal

        (b)    ADDRESS OF PRINCIPAL BUSINESS OFFICE:

               c/o The Mayfield Fund
               2800 Sand Hill Road
               Menlo Park, CA 94025

        (c)    CITIZENSHIP:

               The entities listed in Item 2(a) are California Limited 
               Partnerships.
               The individuals listed in Item 2(a) are U.S. citizens.

        (d)    TITLE OF CLASS OF SECURITIES:

               Common Stock, par value $.001 per share.



                              Page 12 of 17 pages.
<PAGE>   14
        (e)    CUSIP NUMBER:

               2153921100



ITEM 3.  IF THIS STATEMENT IS FILED PURSUANT TO RULE 13d-1(b), OR 13d-2(b), 
         CHECK WHETHER THE PERSON FILING IS A:

         Not applicable

ITEM 4.  OWNERSHIP

         The information regarding ownership as set forth in Items 5-9 of Pages
         2-16 hereto, is hereby incorporated by reference.

         For a summary of total ownership by all Reporting Persons, see Exhibit
         2 hereto.

ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

         If this statement is being filed to report the fact that as of the date
         hereof the reporting person has ceased to be the beneficial owner of
         more than five percent of the class of securities, check the following
         [X] [For Mayfield Associates Fund II only].

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. CERTIFICATION

         Not applicable.



                              Page 13 of 17 pages.
<PAGE>   15
                                   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.

Date:  February 17, 1998

                               MAYFIELD VII
                               A California Limited Partnership

                               By: /s/ George A. Pavlov
                                  -----------------------------------------
                                  George A. Pavlov, Authorized Signatory


                               MAYFIELD VII MANAGEMENT PARTNERS
                               A California Limited Partnership

                               By: /s/ George A. Pavlov
                                  ---------------------------------------------
                                  George A. Pavlov, Authorized Signatory

                               MAYFIELD ASSOCIATES FUND II
                               A California Limited Partnership

                               By: /s/ George A. Pavlov
                                  ---------------------------------------------
                                  George A. Pavlov, Authorized Signatory

                               YOGEN K. DALAL

                               By: /s/ George A. Pavlov
                                  -----------------------------------------
                                  George A. Pavlov, Attorney In Fact

                               F. GIBSON MYERS, JR.

                               By: /s/ George A. Pavlov
                                  -----------------------------------------
                                  George A. Pavlov, Attorney In Fact

                               KEVIN A. FONG

                               By: /s/ George A. Pavlov
                                  -----------------------------------------
                                  George A. Pavlov, Attorney In Fact

                               WILLIAM D. UNGER

                               By: /s/ George A. Pavlov
                                  -----------------------------------------
                                  George A. Pavlov, Attorney In Fact


                               WENDELL G. VAN AUKEN

                               By: /s/ George A. Pavlov
                                  -----------------------------------------
                                  George A. Pavlov, Attorney In Fact



                              Page 14 of 17 pages.
<PAGE>   16

                                    MICHAEL J. LEVINTHAL

                                    By: /s/ George A. Pavlov
                                       -----------------------------------------
                                       George A. Pavlov, Attorney In Fact


                                    A. GRANT HEIDRICH, III

                                    By: /s/ George A. Pavlov
                                       -----------------------------------------
                                       George A. Pavlov, Attorney In Fact



                              Page 15 of 17 pages.
<PAGE>   17
                                    EXHIBIT 1


Exhibit 1-    "Statement Appointing Designated Filer and Authorized
              Signatory" is hereby incorporated by reference to Exhibit B to the
              Statement on Schedule 13G dated February 10, 1997.



                              Page 16 of 17 pages.
<PAGE>   18
                                    EXHIBIT 2

<TABLE>
<CAPTION>
                                                          PERCENT OF
                                                            CLASS
                                                         BENEFICIALLY
  NAME OF REPORTING PERSON       NUMBER OF SHARES          OWNED(1)
- -----------------------------    ------------------    -----------------
<S>                              <C>                   <C>
Mayfield VII,
a California Limited                    973,301 (2)               8.0%
Partnership

Mayfield VII Management
Partners, a California
Limited Partnership                     973,301 (2)               8.0%

MA II                                         0 (3)                 0%

Yogen K. Dalal                          975,158 (4)               8.1%

F. Gibson Myers                         975,158 (4)               8.1%

Kevin A. Fong                           974,301 (4)               8.0%

William D. Unger                        973,301 (4)               8.0%

Wendell G. Van Auken                    975,158 (4)               8.1%

Michael J. Levinthal                    973,301 (4)               8.0%

A. Grant Heidrich, III                  975,158 (4)               8.1%

Total                                   981,729                   8.1%
</TABLE>

(1) The respective percentages set forth in this column were obtained by
dividing the number of shares by the aggregate number of outstanding shares of
Common Stock as of 12/31/97.

(2) Represents shares held of record by Mayfield VII, of which Mayfield VII
Management Partners is the sole General Partner.

(3) Mayfield Associates Fund II disposed of its shares.

(4) The individual Reporting Persons listed are General Partners of Mayfield VII
Management, which is the general partner of Mayfield VII. The individual
Reporting Persons listed in column one may be deemed to have shared voting and
dispositive power over the shares which are or may be deemed to be beneficially
owned by Mayfield VII but disclaim such beneficial ownership. Each individual
Reporting Person expressly disclaims that he is the beneficial owner of any
shares which are held by any other individual Reporting Person in his individual
capacity.



                              Page 17 of 17 pages.


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