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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Figure 2I (a) shows the cono6tions f<strong>or</strong> one lmcl ii a ptahar sqirch box. <strong>lt</strong>r a pt,nar<br />
alohnecrur€, lhe tr&k nuhber is setected in rhe comcction box lh. outpur pin of a tosic<br />
bl@k. A sn h box is a<strong>lt</strong>cd m,/ar<strong>or</strong> ia n is Fsjbtc io lav. ! swilch box on a<br />
<strong>di</strong>f'-c!cnr riack rumberrhen tho one uscd locnter the switch box. FiSur€ 2I (b) shovs rhe<br />
.onn.crons t<strong>or</strong> onc r&k in a non-ttmr swncl box (rr&k o is lhe in@mins hck)_<br />
rfoqtr N rh wilr.n:sirutr h'\ <strong>lt</strong>5l. h i tui.|'rtrrr otrn$tu!, it i5 Dossihte !, $vnch<br />
lion oe lnck nuober ro an<strong>or</strong>h€r rdck nmb€r in cvcry swit€h box; lncs lyp€s of<br />
rcur'ns @hnecurcs impove outability, s shown in[15].<br />
I<br />
il'- -.:,<br />
:i....i<br />
box6: (r) phnar, (b) non'planrWiuon<br />
FPCA lrchirclB thal @nrain nllipte logths of rBck *gnc s de ca<strong>lt</strong>ed sgmenrd<br />
rcuring archirecluEs. F<strong>or</strong> rra.k sgmsrs lhai spao m<strong>or</strong>e dran onc togic bloct, rhe lEck<br />
se8n.nt vill pas thoueh ooc o. noE switch box6 wiolout pGsing lhnugh a *d6<br />
2.3 DETINITION OF THf, FPGA ROUTING PROBLf,M<br />
Many oftb. outing llg<strong>or</strong>irhnB descnbe in rhis clraptcr rts designcd by considcring rhe<br />
ro<strong>di</strong>ng poblem as lin<strong>di</strong>ng a palh f<strong>or</strong> m;h nct lnmugh, <strong>di</strong>r@red saph (C).<br />
i<br />
I]
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