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發表於 2008-4-9 19:56:37
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原來是floating的問題
; O! h8 Y- h/ ^+ }; V7 |9 K" E了解了. I" j# O( T7 w$ X% x% T/ M
感謝你的解答
9 {( Q" C1 N0 p, w. R, N4 }-----------------------------------------------------6 B3 i" m m# G3 ]6 r
另外還有一個問題 也是在DV階段跑出來的warning 如下:+ k5 q# b) J( \% i
$ ^& V6 ?4 o9 S2 Y+ Tdesign_vision-xg-t> write_sdf -version 1.0 dpwm2.sdf& l9 n' X n8 [ l. e3 X
Information: Annotated 'cell' delays are assumed to include load delay. (UID-282)
5 e4 `+ [* m# VInformation: Writing timing information to file '/export/home/stevetu/batman/dpwm2/dpwm2.sdf'. (WT-3), M; j7 j9 C1 O
Warning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[102]'3 g( S4 [5 a8 X5 {, T# [) S
to break a timing loop. (OPT-314)
- k; c2 G% a1 z- y, W/ Q, zWarning: Disabling timing arc between pins 'CDN' and 'Q' on cell 'mp_dpwm1/DFF_reg[10]'1 D1 e6 V ~3 Z. O( M5 s$ _
to break a timing loop. (OPT-314)8 ?/ X6 R |; s* p) d+ M0 k+ @
|" a9 x. k" K' l* e5 F+ Y& |+ B要怎麼判斷這些warning是必須要解決的
z- s( t5 Z- j因為我還可以把波型合成出來
8 [( n0 b" x3 w* W9 B- M6 C可是我怕最後layout部份會有問題
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( ]$ |3 j) X- Z) D( C[ 本帖最後由 小人發 於 2008-4-9 08:32 PM 編輯 ] |
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