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原來是floating的問題
. i" q3 y. a+ a0 O) |了解了
- x) N9 b& ~% J/ a+ e; ?- o; Q感謝你的解答
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5 H2 d' R# Y$ H, S7 E% f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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* {6 [1 K7 r% K( C0 H i+ _# ndesign_vision-xg-t> write_sdf -version 1.0 dpwm2.sdf
( Z6 F, x2 `9 a# Z+ k- d9 }Information: Annotated 'cell' delays are assumed to include load delay. (UID-282)
, Y; I4 s% k1 J% B, mInformation: Writing timing information to file '/export/home/stevetu/batman/dpwm2/dpwm2.sdf'. (WT-3)
# v5 v" X9 M- m$ V b; {( M: a# U, dWarning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[102]'
4 |5 P$ ?- @! z6 L/ k to break a timing loop. (OPT-314) L% Y6 B6 ]' N! l m
Warning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[10]'
3 e5 n ?6 X- S# [& u# a to break a timing loop. (OPT-314)
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" |3 c2 e. n1 H+ M6 Q1 Y要怎麼判斷這些warning是必須要解決的* Q# b5 G' P% v: V5 I0 c) Q
因為我還可以把波型合成出來
# @ C! x$ B+ I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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