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發表於 2008-4-9 19:56:37
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原來是floating的問題) K6 ~2 {+ x ~) e# }: e
了解了3 Q. D+ Z4 f& k/ I/ e J8 i, f
感謝你的解答
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$ @" X9 \% J3 ]( k% ?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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( f; |" L5 ]" N0 u- w+ |! Rdesign_vision-xg-t> write_sdf -version 1.0 dpwm2.sdf
; S0 R. g5 a* `6 A; G; UInformation: Annotated 'cell' delays are assumed to include load delay. (UID-282)1 C6 l+ Y2 a6 f) g
Information: Writing timing information to file '/export/home/stevetu/batman/dpwm2/dpwm2.sdf'. (WT-3), r# m8 ^: d |/ r7 }5 J
Warning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[102]'
2 X3 U5 E( L- S& I+ l to break a timing loop. (OPT-314)7 {: y; a5 f7 ^) h+ Y* K
Warning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[10]'
8 F3 b6 i! r: @, _, A* a4 J to break a timing loop. (OPT-314)1 G3 O2 l. S6 T3 K X7 R; E0 H+ a, N
+ I2 m( v/ K* D8 M" D
要怎麼判斷這些warning是必須要解決的
/ d% v/ G# A. f因為我還可以把波型合成出來* y2 H* E3 ]4 V
可是我怕最後layout部份會有問題% R3 k" F- X' G
7 M" D) S7 @- c# P, C( [[ 本帖最後由 小人發 於 2008-4-9 08:32 PM 編輯 ] |
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