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请问各位大虾，1、HyperLynx对PCB板做快速串扰分析时，需要加入器件IBIS模型吗？2、在加入IBIS模型之后，串扰的值一般是多大，不影响设计？2 d& v; Z4 ^# \& n/ B* g
我在DXP下面找了个example,对其进行快速串扰分析时，不加如IBIS模型，采用默认的模型参数为0 D+ F8 a/ o1 \3 j" v* ^
Board temperature ................ 20.0 degrees C
% z7 B( A0 O% j. K1 X# E9 V- D Default IC model (used for quick analysis if IC model is missing)
1 k: L; `+ i0 R9 _7 D& y; J6 i IC driver rise/fall time ..2.000 ns6 Z0 f1 {4 V& \: x* }
IC driver switching voltage range ..3.00 V
9 q' V- B6 d1 o IC driver output impedance 1.0 ohms* S; ]- \) W) v$ e. _3 v- E
IC input capacitance ..... 7.0 pF
, |3 a( `7 O# U串扰门限为
9 ]" Q5 W& k+ P& x$ u* C$ I EMaximum allowed crosstalk ........... 200 mv peak4 T* H8 n8 ~4 D+ O, p, b1 h
特定看一个网络：7 o3 d8 b" d7 p/ t1 E
NET = SOFT_TCK4 M! T! _6 C" w6 v
ELECTRICALLY ASSOCIATED NETS --------------------------------------
# x: O& @3 U) d0 T& \. i2 M( { None
7 C" l7 k8 I$ f: g7 A* b+ H% Z/ S AGGRESSOR NETS (Estimated peak crosstalk)
" B. q/ j E# R2 k- ] y NetFPGA1S_B22 .................. 233 mv
3 r$ v# m9 ?: b p3 K v i+ B+ U Total estimated crosstalk ....................... 233 mv
+ t/ q$ _* m s& l) X ** Warning ** Estimate exceeds maximum allowed crosstalk!
+ ^& | B8 }! y; ~( R p& z而我分配模型之后，该网络的串扰增加了很多：
# O5 }4 } Z" h2 r0 ]$ I3 H) l NET = SOFT_TCK
2 G+ F7 S" x+ i* @, w+ S6 W9 t+ n2 F4 b [ ELECTRICALLY ASSOCIATED NETS --------------------------------------8 ]# P* M: r' X, h( L& p, E1 H
None
; v' a Q! Z" u4 f4 O# Q AGGRESSOR NETS (Estimated peak crosstalk)3 B" [1 J$ }+ p- O
NetFPGA1S_B22 ..................1268 mv
- Y+ e! q, p8 R+ A c NetFPGA1S_A21 ..................1053 mv2 R6 d" Y- o: {7 p5 v3 q: H. j
NetFPGA1S_A20 .................. 456 mv' q# h; C& M& M! Z8 k0 l+ h$ m
SOFT_TDI ....................... 319 mv% ^$ i3 h# E+ p6 y' @$ m) k
DIG5_SEG2 ...................... 227 mv! L, O3 c/ w; u! Y
Sum of the two strongest aggressors .............2321 mv
7 ]- B: m& v+ Y% H3 l8 s+ x, S ** Warning ** Estimate exceeds maximum allowed crosstalk! |
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发表于 2009-12-21 10:07
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支持！
反对！