<SUBMISSION>
<ACCESSION-NUMBER>0000950134-04-012849
<TYPE>424B3
<PUBLIC-DOCUMENT-COUNT>1
<FILING-DATE>20040826
<DATE-OF-FILING-DATE-CHANGE>20040826
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>CADENCE DESIGN SYSTEMS INC
<CIK>0000813672
<ASSIGNED-SIC>7372
<IRS-NUMBER>770148231
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>0102
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>424B3
<ACT>33
<FILE-NUMBER>333-110346
<FILM-NUMBER>04998559
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>2655 SEELY ROAD BLDG 5
<CITY>SAN JOSE
<STATE>CA
<ZIP>95134
<PHONE>4089431234
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>555 RIVER OAKS PARKWAY
<CITY>SAN JOSE
<STATE>CA
<ZIP>95134
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>ECAD INC /DE/
<DATE-CHANGED>19880609
</FORMER-COMPANY>
</FILER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<FILENAME>f01510b3e424b3.htm
<DESCRIPTION>424B3
<TEXT>
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<DIV style="font-family: 'Times New Roman',Times,serif">


<P align="center" style="font-size: 10pt"><B>Filed under Rule&nbsp;424(b)(3) of the Securities Act of 1933,<BR>
relating to Registration No.&nbsp;333-110346</B>



<P align="center" style="font-size: 10pt"><B>Prospectus Supplement No.&nbsp;7<BR>
to Prospectus Dated April&nbsp;29, 2004<BR>
of</B>


<P align="center" style="font-size: 24pt"><B>CADENCE DESIGN SYSTEMS, INC.</B>


<P align="center" style="font-size: 10pt"><B>Relating to</B>



<P align="center" style="font-size: 10pt"><B>$420,000,000 Zero Coupon Zero Yield Senior Convertible Notes due 2023<BR>
and<BR>
Shares of Common Stock Issuable upon Conversion of the Notes</B>



<P align="center" style="font-size: 10pt"><HR size="1" noshade width="18%" align="center">



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus supplement no. 7 relates to the resale by selling
securityholders of Cadence Design Systems, Inc.&#146;s Zero Coupon Zero Yield Senior
Convertible Notes Due 2023 and the shares of Cadence common stock issuable upon
conversion of the notes.


<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You should read this prospectus supplement no. 7 in conjunction with the
prospectus dated April&nbsp;29, 2004, which should be delivered in conjunction with
this prospectus supplement. This prospectus supplement is not complete without,
and may not be delivered or used except in conjunction with, the prospectus,
including any amendments or supplements to it. This prospectus supplement is
qualified by reference to the prospectus, except to the extent that the
information provided by this prospectus supplement supercedes information
contained in the prospectus.


<P align="center" style="font-size: 10pt"><HR size="1" noshade width="18%" align="center">



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Investing in the notes and the common stock issuable upon conversion of
the notes involves risk. See the discussion entitled &#147;Risk Factors&#148; beginning
on page 6 of the prospectus dated April&nbsp;29, 2004.</B>


<P align="center" style="font-size: 10pt"><HR size="1" noshade width="18%" align="center">



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
adequacy or accuracy of this prospectus supplement or the prospectus dated
April&nbsp;29, 2004. Any representation to the contrary is a criminal offense.</B>


<P align="center" style="font-size: 10pt"><HR size="1" noshade width="100%" align="center">



<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The table under the caption &#147;Selling Securityholders&#148; beginning on page 51
of the prospectus is hereby supplemented and amended by updating information as
to a certain selling securityholder identified in the table below. We prepared
this table based on information supplied to us by the selling securityholder
named in the table below on or prior to August&nbsp;26, 2004. Information about the
selling securityholder may change over time. If required, any changed or new
information given to us will be set forth in supplements to the prospectus or
amendments to the registration statement of which this prospectus is a part, if
and when necessary.


<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We have assumed for purposes of the table below that the selling
securityholder will sell all of the notes and all of the common stock issuable
upon conversion of the notes pursuant to this prospectus supplement and the
prospectus, and that any other shares of our common stock beneficially owned by
the selling securityholder will continue to be beneficially owned.


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">

<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Except as set forth below, the selling securityholder does not have, nor
within the past three years has had, any position, office or other material
relationship with us or any of our predecessors or affiliates.


<P align="left" style="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The selling securityholder identified below may have sold, transferred or
otherwise disposed of, pursuant to transactions exempt from the registration
requirements of the Securities Act of 1933, as amended, all or a portion of its
notes since the date on which it provided the information regarding its notes.

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="21%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="7%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="17%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Number of Shares</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>&nbsp;</B></TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Number of Shares</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>of Common Stock</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>&nbsp;</B></TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Principal Amount of</B></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>of Common Stock</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Number of Shares</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Beneficially Owned</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Natural Person(s)</B></TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left"><B>Name of Selling</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Notes Beneficially</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Percentage of</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Beneficially</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>of Common Stock</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>after the</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>with Voting or</B></TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left"><B>Securityholder</B><HR size="1" noshade></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Owned and Offered</B><HR size="1" noshade></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Notes Outstanding</B><HR size="1" noshade></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Owned(1)(2)</B><HR size="1" noshade></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Offered (1)</B><HR size="1" noshade></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Offering(2)(3)</B><HR size="1" noshade></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center"><B>Investment Power</B><HR size="1" noshade></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Whitebox<BR>
Convertible<BR>
Arbitrage Partners<BR>
LP (4)
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="bottom">$</TD>
    <TD align="right" valign="bottom">25,640,000</TD>
    <TD nowrap valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="bottom">&nbsp;</TD>
    <TD align="right" valign="bottom">6.10</TD>
    <TD nowrap valign="bottom">%</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="bottom">&nbsp;</TD>
    <TD align="right" valign="bottom">1,637,857</TD>
    <TD nowrap valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="bottom">&nbsp;</TD>
    <TD align="right" valign="bottom">1,637,857</TD>
    <TD nowrap valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="bottom">&nbsp;</TD>
    <TD align="right" valign="bottom">0</TD>
    <TD nowrap valign="bottom">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="bottom">Andrew Redleaf</TD>
</TR>

<!-- End Table Body -->
</TABLE>
</DIV>




<P>
<HR size="1" width="18%" align="left" noshade>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top">
    <TD width="1%" nowrap align="right">(1)</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="96%">Assumes conversion of all of the holder&#146;s notes at a conversion rate of
63.8790 shares of common stock per $1,000 principal amount at maturity of the
notes. This conversion rate is subject to adjustment as described under
''Description of Notes &#151; Conversion Rights&#146;&#146; in the prospectus dated April&nbsp;29,
2004. As a result, the number of shares of common stock issuable upon
conversion of the notes may increase or decrease in the future. Excludes shares
of common stock that may be issued by us upon the repurchase of the notes as
described under ''Description of Notes &#151;  Repurchase of the Notes by Us at the
Option of Holders Upon a Fundamental Change&#146;&#146; in the prospectus and fractional
shares. Holders will receive a cash adjustment for any fractional share amount
resulting from conversion of the notes, as described under ''Description of
Notes &#151; Conversion Rights&#146;&#146; in the prospectus.</TD>
</TR>

<TR><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD width="1%" nowrap align="right">(2)</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="96%">The number of shares of common stock beneficially owned by the holder named
above is less than 1% of our outstanding common stock, calculated based on
273,356,132 shares of common stock outstanding as of April&nbsp;3, 2004. In
calculating this amount for such holder, we treated as outstanding the number
of shares of common stock issuable upon conversion of all of such holder&#146;s
notes, but we did not assume conversion of any other holder&#146;s notes.</TD>
</TR>

<TR><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD width="1%" nowrap align="right">(3)</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="96%">For the purposes of computing the number and percentage of notes and shares
to be held by the selling securityholder after the conclusion of the offering,
we have assumed for purposes of the table above that the selling securityholder
named above will sell all of the notes and all of the common stock issuable
upon conversion of the notes offered by this prospectus supplement and the
prospectus, and that any other shares of our common stock beneficially owned by
the selling securityholder will continue to be beneficially owned.</TD>
</TR>

<TR><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD width="1%" nowrap align="right">(4)</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="96%">This selling securityholder was previously listed as Whitebox Convertible
Arbitrage Partners LP, and as holding $20,000,000 of the notes, this new amount
and information supercedes all prior information concerning Whitebox
Convertible Arbitrage Partners LP.</TD>
</TR>

</TABLE>



<P align="center" style="font-size: 10pt"><HR size="1" noshade width="18%" align="center">



<P align="center" style="font-size: 10pt">The date of this prospectus supplement is August&nbsp;26, 2004.




<P align="center" style="font-size: 10pt">2
</DIV>


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