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發表於 2008-4-9 19:56:37
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原來是floating的問題
( @3 u& [5 w! H, Y了解了
% m, M* y; K7 R4 x1 F9 t感謝你的解答
$ V- H. i: n( N2 o' ~! x- a-----------------------------------------------------
% n E3 {: c" u( l: m另外還有一個問題 也是在DV階段跑出來的warning 如下:4 m4 L9 v3 `- P9 u* v1 Z" J
" _1 v7 C" q7 ]3 Udesign_vision-xg-t> write_sdf -version 1.0 dpwm2.sdf
2 e( q0 C& s& j0 t8 V* DInformation: Annotated 'cell' delays are assumed to include load delay. (UID-282)
2 _, y1 X0 S! P) [) D5 R yInformation: Writing timing information to file '/export/home/stevetu/batman/dpwm2/dpwm2.sdf'. (WT-3)
) y8 t' r2 z$ m( A6 F8 L3 jWarning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[102]'- J* a4 ` S+ H, d) d7 b" u. X
to break a timing loop. (OPT-314)
6 F/ v2 c/ W/ L% X- n5 ^. ]2 C5 wWarning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[10]'
2 A8 ~- O$ c& D. y' T D to break a timing loop. (OPT-314)7 z' z5 f& Z- _, W
' ]$ ^5 c X7 J# y
要怎麼判斷這些warning是必須要解決的+ ] E$ F0 [ }
因為我還可以把波型合成出來) `- [2 T$ d) T' z6 B1 s
可是我怕最後layout部份會有問題) M: t# m* K! K o0 m
/ x8 o$ E, o. I* c9 C* ]
[ 本帖最後由 小人發 於 2008-4-9 08:32 PM 編輯 ] |
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