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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ipped-up all <strong>rl</strong> onc., but ihstead €ach ner b ripped-up sepdar€ly (l€aving atl rhe <strong>or</strong>h.r<br />
ncrs in plee) and E-oukd. Sevcral itiations ae perfomed lo allcviare rcurins<br />
con8dtion. Ners aE routcd in the ene <strong>or</strong>dd ii €ach n€<strong>di</strong>on, bur only one nel ir ripped-<br />
up at a tine. Congdlion is idrnlified by kaping t@k of the nunber of nets .!ren<strong>rl</strong>y<br />
occupynrg each roulinS !€surce node, Any node wilh e @cupsncy gr.ater $aD one is<br />
considcred congestcd. Nair\ lechniqu€ ir very ef€clive f<strong>or</strong> resolvins conge$ion<br />
poblems, becau* ncls in rcn-coogcsred dd @ d$ b. cl@aled 10 allos n.ts using<br />
@nscsLd re(@s lo be re<strong>lt</strong>d moE 6ily. Now that w have dMib€d $mc of tb.<br />
bosic rcchniqucs uscd by nniy iouriig ,lg.rithms. rhc Dcxt lwo $crionslcscribc scvcftl<br />
rouringalso hnr in <strong>or</strong>ederail,<br />
23.3 CouB. Gnth E{'rision (ccD)<br />
'fhe COE ruling alg<strong>or</strong>i$m. d€velop€d by Bou.l.l 021, is th. fid acd.lea,. outii8<br />
!l8o hfr dev.loFd f<strong>or</strong> isl.nd-slyle FPOA' cGE h ! ourability-driven router. a<strong>lt</strong>hough<br />
rnning crilical nec can be assigned a hiSIet pri<strong>or</strong>ily in th€ ro<strong>lt</strong>ing ale<strong>or</strong>nhF<br />
The global rouiing alg<strong>or</strong>ithm u*d by CGE is lie LcsRoule global tolliDg alSonthm<br />
f<strong>or</strong> sidndad cclls. In the L@usRoulc alg<strong>or</strong>ithm, mu<strong>lt</strong>i-t niml rc$ arc bokq uP inlo<br />
mo-tcminal nc$. E ch rse|crniml ner is then ouled usin8 a mininln lenglh palh<br />
Pdhs arc cho*n so !s to balrm $e neN mong all the channels<br />
The CCE derailcd roulihg llg<strong>or</strong>nhm is <strong>di</strong>lided i o two steps. ln the Iitst slep, each<br />
global outc is expaidcd inlo a sel ola<strong>lt</strong>emarivs dehilcd Dutcsi cach nDl
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