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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qudd-length egm.nls iotrre insroupsoffour. e ftd each qed-lenslh esmenr swirches<br />
.t evert fou<strong>rl</strong>h swirch box, Each quad lo qued conn€crion conrfuns six pss rmnsisr<strong>or</strong>s<br />
rnd one buffcr $!t cao be used by ary onc of dE incoFing quad eshents to dlivc<br />
<strong>or</strong>lloing segmc s. The bllle6 it useful f<strong>or</strong> implcmenting biSh-spced connections $<strong>rl</strong><br />
spu ! long <strong>di</strong>slan* The longlcnelh t@k seen.n6 do nol swilch lo ant other long-<br />
lctrgth s.gnsnts in lhe logic block. l-otrglcngth scgm€nts connccl lo olho long-lcnglh<br />
segmcn$ in rhe onho8onal <strong>di</strong>Ecrio! al rhe cdges of lhe FPCA. Th.rc aE rwo rypcs of<br />
longlength sgmenls: the liEl typi @nt ins ! prcgrmnable splill€r in lhe niddle of t<br />
sgmenl lo a<strong>lt</strong>ow fic long egfrcnr lo be splil into lm independe senenlsa $c other<br />
ly!'e conlains bulles !t $c l/4. 12. and l/4 poin$ of lhe segm€nt Tne* bufle6 also<br />
impruve lhe pc.iomdce toi FPGAS wnh lery large ,my sircs. Thee d dso mny<br />
co.nerions belwcn esrncnc of<strong>di</strong>lf.c lenSlhs. In qch logic block. mdl ot lhe quad_<br />
lenglh lEck scgoents connat lo single and doublelcngth slnents in nrc onhogonil<br />
<strong>di</strong>r€cion using p6s tdsisl<strong>or</strong> sqitches. Thc* connetions arc hiShlkhlcd bt thc t@<br />
slid ci(les in Fisur. 2 10. The rctation of qlad dd double <strong>lt</strong>&k *8m.nn caus 0rc<br />
con.4tions lo shifi in 4ch loeic block 1i1.. Long_len$h segmsts com€ct to single_<br />
lengd s.8DenB in (h. onhogohol <strong>di</strong>dcrion. The conneclion boxes. fo! connecting logic<br />
block pins ro tack scsnenls. ar€ lrigblighted by dashed boxes ir FiguE 2 l I Thc nrpurs<br />
k, <strong>rl</strong>r hrgic bli,cl h!!c l:c-w, whilc <strong>rl</strong>Nou<strong>lt</strong>uBluvc l:c{2sw<br />
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