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發表於 2008-4-9 19:56:37
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原來是floating的問題. J. W9 R8 {1 V7 W, X- [
了解了$ X- j! y9 G- V+ L# `- E5 c
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:% ~$ l) K6 o& D0 n5 _" y
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design_vision-xg-t> write_sdf -version 1.0 dpwm2.sdf
9 r; U w3 `, v3 R kInformation: Annotated 'cell' delays are assumed to include load delay. (UID-282)
- j% B1 u4 r4 W' l! SInformation: Writing timing information to file '/export/home/stevetu/batman/dpwm2/dpwm2.sdf'. (WT-3)
5 v) q/ N: n' B) l1 E* n$ }: @2 GWarning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[102]'
! w$ ?7 y9 p( b# w to break a timing loop. (OPT-314)- J) a4 o9 }/ Z
Warning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[10]'2 E: H( Z p6 m0 l6 _
to break a timing loop. (OPT-314) P* ~$ S8 t* v, I# A; {
2 P f u& b3 a `- h/ L要怎麼判斷這些warning是必須要解決的
4 V0 R" z) \* J& X$ b4 z# P9 L因為我還可以把波型合成出來
: Z" M+ m6 N- ]- W2 E7 X) V, h: L可是我怕最後layout部份會有問題
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" T a0 b3 `$ U- H5 T& I: r+ i[ 本帖最後由 小人發 於 2008-4-9 08:32 PM 編輯 ] |
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