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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 FDZJhHjYuVmSPgUo7Sf6gtezC9c6G/GQcPrIzsZYXRtCra2rmEVKzA2Xh7o4CrIB
 R/8Ck/feUvh8Gz04teg9gg==

<SEC-DOCUMENT>0001464410-09-000001.txt : 20090825
<SEC-HEADER>0001464410-09-000001.hdr.sgml : 20090825
<ACCEPTANCE-DATETIME>20090825173823
ACCESSION NUMBER:		0001464410-09-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090825
FILED AS OF DATE:		20090825
DATE AS OF CHANGE:		20090825

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Petrakian Raja
		CENTRAL INDEX KEY:			0001464410

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-18548
		FILM NUMBER:		091034719

	MAIL ADDRESS:	
		STREET 1:		2100 LOGIC DRIVE
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95124

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			XILINX INC
		CENTRAL INDEX KEY:			0000743988
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				770188631
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0401

	BUSINESS ADDRESS:	
		STREET 1:		2100 LOGIC DR
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95124
		BUSINESS PHONE:		4085597778

	MAIL ADDRESS:	
		STREET 1:		2100 LOGIC DRIVE
		CITY:			SAN JOSE
		STATE:			CA
		ZIP:			95124
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-08-25</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000743988</issuerCik>
        <issuerName>XILINX INC</issuerName>
        <issuerTradingSymbol>xlnx</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001464410</rptOwnerCik>
            <rptOwnerName>Petrakian Raja</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2100 LOGIC DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SAN JOSE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95124</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>SVP World Wide Operations</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2009-08-25</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2009-08-25</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>591</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>22.13</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1444</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>Raja Petrakian</signatureName>
        <signatureDate>2009-08-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----