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發表於 2008-4-9 19:56:37
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原來是floating的問題
0 E) I" J7 Y5 ]3 ]: V了解了) l! b+ m/ c. F. ~. W4 A G
感謝你的解答 . E) A* ]# }! ]# p& f
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' y$ e5 O2 x+ Q# Q另外還有一個問題 也是在DV階段跑出來的warning 如下:# h8 U& n! n9 E
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design_vision-xg-t> write_sdf -version 1.0 dpwm2.sdf
5 j" q" j: O0 KInformation: Annotated 'cell' delays are assumed to include load delay. (UID-282)2 d R! t3 r7 Z) t$ \
Information: Writing timing information to file '/export/home/stevetu/batman/dpwm2/dpwm2.sdf'. (WT-3)
) B- u( C2 t8 [" H0 e5 gWarning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[102]'9 h3 ~1 G$ w( P5 D Z7 X9 [
to break a timing loop. (OPT-314)& X* x8 n/ g4 ^
Warning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[10]'
2 j# v+ X5 z) w- v" t to break a timing loop. (OPT-314)' Z: t, q8 ^' f# _4 B V2 Y( @! Z
! w- [& K8 L8 j5 l要怎麼判斷這些warning是必須要解決的7 q. L/ ]8 {6 v+ h' o
因為我還可以把波型合成出來' j7 @/ u+ @5 K# R# z
可是我怕最後layout部份會有問題
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8 C3 [ f0 G2 R, j Q8 S" [' e ^[ 本帖最後由 小人發 於 2008-4-9 08:32 PM 編輯 ] |
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