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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The sond k y meric fo. FPCtu is rhen 3p..d m..s<strong>or</strong>.d by rh. fihicat path detay.<br />
Thd r<strong>or</strong>aL cririql pafi d.tay is d.fincd 6 rh. rol<strong>lt</strong> dcta) due ro rhe logic ctujer<br />
combined with th. routing dclay. FiguE 6,5 sho$ rhe g@nerric av.mS. of the t<strong>or</strong>sl<br />
criticalpath dclay acro$ dll20.ircui$ os o funclion ofrhe ctusre, size sd LUT size<br />
Observing thd Fie!re. it is cl4r thar incB.sing ctusrer eize <strong>or</strong> LUTS. d€cre{ses rhe<br />
crnical pah delay. Th.s. d.c@s .rc ai8nincsnr: mehirecturcwi.h N=l and K=?<br />
hasd rvedgedelayof25 ns whilc fo. LUT-?, hdd cvebge cdri€t palh detay of<br />
jlsl 16 6. There .re rwo ftnds rh<strong>lt</strong> cxpld. ihis b.h.vi<strong>or</strong>, As rh€ LUT snd ctBrcr<br />
i. Th€ d€lry of rh. IUT ed rhc dclay $ough . clun6 irc€.s.<br />
> Th. nunb.r of LUTS dd clust 6 in ei.s on lhc qiriat prd dtu!<br />
wc Nill <strong>di</strong>sus th@ .n cc io BoE d<strong>di</strong>t b.low.<br />
It is inshcriv. ro b@k lh. rot l d.t.y inro rwo @mpondrs: inlm{tNer dchy<br />
(shicn includcs ih. delat ofthc m!x.s.nd LUTS), rnd int r<strong>rl</strong>05rerd.lay. Figure 6.6<br />
sh<strong>or</strong>s rh. ponion ofrhecriricalp.rh delat rhar co6.s fioft rh. inrra,cluster delay 6 a<br />
lunciion of K and N. Th.rc .rc two lcy points lo obsfl. her..
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