lt tDrtrcnr or Eleiro.ics, Td@6o!!iolio, & ttior.di.rl E.linerttrg
lt tDrtrcnr or Eleiro.ics, Td@6o!!iolio, & ttior.di.rl E.linerttrg
lt tDrtrcnr or Eleiro.ics, Td@6o!!iolio, & ttior.di.rl E.linerttrg
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r 4r''r,r. tii!,l<strong>rl</strong>r!4 '(')-.n<strong>rl</strong>. rr!''<strong>rl</strong> i,J ',r,r<br />
wbere i is the itcraion numb€r. dd ,r- b. valne thnl $al4 rhc hist<strong>or</strong>ical congestion<br />
Fna<strong>lt</strong>t. Tn€ hisr<strong>or</strong>iel conSe$ioo Fnahy is updated afier *h rouling ircradon.<br />
Thc values of/rs and tr& @opris wbal is c,lled $c Dutirg J.r..rul.. Noml<strong>lt</strong>, the<br />
llliu<strong>lt</strong> b,tikt lchulub ol vPl{ is usd. whcrc rhc vrhrc tur/)ri. is sur ro 0.5 <strong>or</strong> lcss i[<br />
rh€ fid i{€ntion and incr.sed by 1.5 b 2 tin6 in sub*qn€nl ileElions. Thc volue ol<br />
,rd is sel ro my value b€rween 0.2 and l. md remains consani in subs.quefl n.nrions<br />
Witl $e defallr ouliDS $hedule, VPR uually rcquiBs sleral ileratiotrs lo oute a<br />
circuir. The out.r can be speed up by lm lo th@ rincs by s<strong>lt</strong>ing pr* dd ,r- lo 10000.<br />
callcd dE /dr, ,<strong>or</strong>/,,9 .$r4tlllG. The f6t @uliog eh.dule f<strong>or</strong>ccs lhe rcut$ lo aloid oveF<br />
usilr8 routins lcsoures il po$ibh, esu<strong>lt</strong>ing in a lcducrion irr lhe number ol outins<br />
nmions. F<strong>or</strong> .6y Doblcms, thc routcr can smeliDcs rcurc the circun in jut one<br />
ncration. The fastrouri<strong>rl</strong>g sclEdule lypically dquircs only 2% b 4% nolc lracks ovef llre<br />
b6r uock couDr f<strong>or</strong> a circuit by VPR.<br />
Anoth.r impon.nl .nhanceme.l in VPR !.Fu Palh,lntler is thc nann r h which rhe<br />
muti.8 tee is placed back on rhc pio'iry queue when duting a mullit€rninal ner'<br />
RmcNb.r lhal |he P!$lloder als<strong>or</strong>ithm cdptiB $e PQ aner och sint is rc&hcd in a<br />
nnrhi-ominal net, and puts lbe conplete RT back on 6e PQ Ge lnE ?) F<strong>or</strong> vcrv hrgh_<br />
idout ne$, $c RT is very lsrse, Equning signitcml CPU timc simPly lo placc lhc R-r<br />
o. rhe PQ f<strong>or</strong> each sink, vPR conlaihs a n@h n<strong>or</strong>e elfrciem n.lhod. called $e<br />
qthitc.l hftd.ih-li{t vuch. *heto rhe PQ G len it ns cuntrn slate aiDr ieachirrs n<br />
(t.6)<br />
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