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發表於 2008-4-9 19:56:37
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原來是floating的問題
' K Q9 l) A3 d5 h; n了解了
$ r; |, v0 D. t7 a7 d" q1 ]! i0 o感謝你的解答 4 [ \( q- a, a3 K
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1 e& c5 j6 w! i9 j$ I9 {另外還有一個問題 也是在DV階段跑出來的warning 如下:
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design_vision-xg-t> write_sdf -version 1.0 dpwm2.sdf$ r) l- V) a* e" a( A3 f( S- m
Information: Annotated 'cell' delays are assumed to include load delay. (UID-282)
) J2 P- H# X( l E/ ^( I4 cInformation: Writing timing information to file '/export/home/stevetu/batman/dpwm2/dpwm2.sdf'. (WT-3)# c+ `, B7 w1 w# `
Warning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[102]'8 J+ ]3 {3 L3 j0 g# N# B" Q- w% O
to break a timing loop. (OPT-314)( @* F) e& F! W7 [3 t$ D4 h" M
Warning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[10]'# J. z+ Q0 M5 y7 y' g, \) B
to break a timing loop. (OPT-314)' e; E1 O5 o7 y: b! i
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要怎麼判斷這些warning是必須要解決的, G( [, K# ]6 {& o8 D
因為我還可以把波型合成出來8 l4 w8 `% Z M7 k" U, A# ^ h
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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