PLD符号元件说明

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1、在PLDSymbols.lib库中有多达360种的PLD库元件。1.运算器ACC1：1-Bitloadablecascadableaccumulatorwithcarry-in,carry-out,andsynchronousreset。ACC16：16-Bitloadablecascadableaccumulatorwithcarry-in,carry-out,andsynchronousreset。ACC4：4-Bitloadablecascadableaccumulatorwithcarry

2、-in,carry-out,andsynchronousreset。ACC8：8-Bitloadablecascadableaccumulatorwithcarry-in,carry-out,andsynchronousreset。ADD1：1-Bitfulladderwithcarry-inandcarry-out。ADD16：16-Bitfulladderwithcarry-inandcarry-out。ADD4：4-Bitfulladderwithcarry-inandcarry-out。A

3、DD8：8-Bitfulladderwithcarry-inandcarry-out。19ADSU1：1-Bitcascadableadder/subtractorwithcarry-inandcarry-out。ADSU16：16-Bitcascadableadder/subtractorwithcarry-inandcarry-out。ADSU4：4-Bitcascadableadder/subtractorwithcarry-inandcarry-out。ADSU8：8-Bitcascada

4、bleadder/subtractorwithcarry-in,carry-outandOverflow。X74_280：9-BitOdd/EvenParitygenerator/checker。X74_283：4-Bitfulladderwithcarry-inandcarry-out。1.缓冲器BUF：Generalpurposebuffers。BUF16：Generalpurposebuffers。BUF4：Generalpurposebuffers。BUF8：Generalpurposeb

5、uffers。BUFE：Internal3-Statebuffers。BUFE16：Internal3-Statebuffers。BUFE4：Internal3-Statebuffers。BUFE8：Internal3-Statebuffers。BUFG：Globalclockbuffer。BUFGP：PrimaryGlobalbufferfordrivingclocksorlonglines(FourperPLDdevice)。BUFGS：Secondarybufferfordrivingclo

6、cksorlonglines(FourperPLDdevice)。BUFT：Internal3-Statebuffers。BUFT16：Internal3-Statebuffers。BUFT4：Internal3-Statebuffers。BUFT8：Internal3-Statebuffers。2.比较器19COMP16：16-BitIdentityComparator。COMP2：2-BitIdentityComparator。COMP4：4-BitIdentityComparator。COM

7、P8：8-BitIdentityComparator。COMPM16：16-BitMagnitudeComparator。COMPM2：2-BitMagnitudeComparator。COMPM4：4-BitMagnitudeComparator。COMPM8：8-BitMagnitudeComparator。COMPMC16：16-BitMagnitudeComparator。COMPMC8：8-BitMagnitudeComparator。X74_518：8-Bitidentitycompa

8、ratorwithactive-lowenable。X74_521：8-Bitidentitycomparatorwithactive-lowenableandoutput。X74_L85：4-Bitexpandablemagnitudecomparator。1.计数器CB16CE：16-BitcascadablebinarycounterwithclockenableandasynchronousClear。CB16CLE：16-Bitloadablecascadablebina