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發表於 2008-4-9 19:56:37
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原來是floating的問題
% P6 m# ]. E1 O+ V. T了解了- g9 ]! ]" h6 c- Y4 P
感謝你的解答
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另外還有一個問題 也是在DV階段跑出來的warning 如下:
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design_vision-xg-t> write_sdf -version 1.0 dpwm2.sdf7 s/ E& w" R6 ?- z* ^# v
Information: Annotated 'cell' delays are assumed to include load delay. (UID-282)
" h9 [% @. Q3 m `) f+ GInformation: Writing timing information to file '/export/home/stevetu/batman/dpwm2/dpwm2.sdf'. (WT-3)# h5 M3 _, P5 B) R+ h9 c5 p
Warning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[102]'; |. W0 Q x: d" a3 v: l
to break a timing loop. (OPT-314)/ s8 c U" i" M5 b5 [
Warning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[10]'
1 @- T+ `, q- r/ Z( `! A to break a timing loop. (OPT-314)
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要怎麼判斷這些warning是必須要解決的
. b/ T* T% J$ K5 v# v, ]因為我還可以把波型合成出來1 \- x: y+ s- R( j5 R7 O% i
可是我怕最後layout部份會有問題
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[ 本帖最後由 小人發 於 2008-4-9 08:32 PM 編輯 ] |
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