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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silk. rDd.iusl lD ncw ponion ofrhc rcuing used to Each $e ncw sirk is addcd back<br />
onlo lhc PQ. Tn€ s€mh f<strong>or</strong> rhe next sinl is lhq @nlinued 4 .omal, l he oflihized<br />
bcrdtlllirst scdlch enh.Dcemenl rcsu<strong>lt</strong>s i. d <strong>or</strong>deFol-magnitude speedut. @npaad b<br />
usine thc rcgular breaddrfid salch.<br />
In comp<strong>di</strong>$n lo all offic odd o!te6 d.s.rib€d in lhis chapt r, VPR is able ro &hierr<br />
lhe lowest tnck couhrs.coss a series ofshaller b.hchnart circuns, coDkhihg cncuits<br />
ritn up to it8 lo3ic bl@ks. The ourabililynrivm VPR ouid obtaiftd a 104 lowr<br />
lrucl count, on uveraSc. conparcd to ih. next b€sl router. IRACER. Using lhc vl'R<br />
globll tuuter with lhe dehiled ourer of SEGA, E ro .bililynriven VPR rcuter<br />
rchicvud, l4v! lowcr kuck coum, on !!.r!8.. compurul lo SLG LlsirE a $t<strong>ics</strong> ol<br />
huch largr benchmark cncuits conhininS !p 1o 8383 logic clustes. VPR lsed 70%<br />
lew€r r@ks per chflnel. on aEdse. ontarcd to SEGA.<br />
The imine-driven rculins alg<strong>or</strong>ilhn of VPR n abo b6ed uPon Pathlinder, b<strong>lt</strong> thc<br />
rining-dliv€n contonenl is hrdl.d <strong>di</strong>tr€rntly by VPR. In Paihfiodet, a lin d delav<br />
nodcl is sd. whm e.ch rcutinB Ee<strong>lt</strong>cc hs a consl.fl d.lav {d $e delavs tE<br />
s0Nnsd lo find lhe palh delay Fo! Imck segFents lhal aE coDn€cled using bllfcs.lhe<br />
line d.lay is ocudle. But, f<strong>or</strong> l@k *en.n$ that aE omcctcd !si.e pas trd3islo6.<br />
lhe lineo d€lay model is hidly inaccmte, baause it laih ro |ar€ irto.ccount thc facr<br />
rhar $c delay lhrolgh a pass <strong>lt</strong>Msist<strong>or</strong> dcp.nds on the <strong>or</strong>her.l.neds @nneded lo lhe<br />
pcs thnrisro'. lr is slFwn in { l4l how $c li.w dchy nodel causs rhc roulq lo chm$<br />
incofl.cl palhs dnong a<strong>lt</strong>crMtivcs. vPRus* th€ Elh<strong>or</strong>e delav nodel [28], which modeh<br />
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