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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？
, s. I7 u0 Q% ~, C8 q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1 u. d! S6 P+ A
Board temperature ................ 20.0 degrees C
4 W2 l5 _* b% N5 _; W$ j; r Default IC model (used for quick analysis if IC model is missing)
' Q: P$ E. Y- Y: U# v IC driver rise/fall time ..2.000 ns9 A# V g/ i, N# k7 V0 k
IC driver switching voltage range ..3.00 V8 m6 ?7 ?7 a, |7 B
IC driver output impedance 1.0 ohms4 c* ^2 k- Q7 i7 ~
IC input capacitance ..... 7.0 pF& A- W+ I! [! |1 k! h
串扰门限为
6 I8 p1 P# `% | |* _" D' nMaximum allowed crosstalk ........... 200 mv peak9 J. F. `1 t0 Z/ x/ @/ X
特定看一个网络：
( m9 V" P L& ? NET = SOFT_TCK
& ^7 y4 ~5 E( N' v ELECTRICALLY ASSOCIATED NETS --------------------------------------
& `/ F/ C. [4 T5 F; e% i2 c0 U* X6 R None
5 K! V" W% {5 h3 a9 P5 _: v AGGRESSOR NETS (Estimated peak crosstalk)) D' i5 d, |: {. X
NetFPGA1S_B22 .................. 233 mv
# ]2 U" X! C; k Total estimated crosstalk ....................... 233 mv
3 Q% j8 I2 s/ ~3 u% U5 n! X ** Warning ** Estimate exceeds maximum allowed crosstalk!' v! l: u7 W: _1 [) y4 z- V
而我分配模型之后，该网络的串扰增加了很多：2 ]5 I: S$ b+ f/ s, |' p
NET = SOFT_TCK3 I, O& m% W' S$ e
ELECTRICALLY ASSOCIATED NETS --------------------------------------& ?" D3 l$ V. J7 n; S
None# d9 a) Q( Y; M9 |" t9 ~4 o
AGGRESSOR NETS (Estimated peak crosstalk)0 X$ i. A# |1 A9 l3 m V
NetFPGA1S_B22 ..................1268 mv3 F6 x) o: q; M% T3 a+ j
NetFPGA1S_A21 ..................1053 mv
9 Z; F; T( M# i# N# p NetFPGA1S_A20 .................. 456 mv$ S6 L- k- [6 R5 ?" l6 x
SOFT_TDI ....................... 319 mv
& j) d$ ^5 E9 M# r DIG5_SEG2 ...................... 227 mv O7 X& @9 C& _, W3 M! c
Sum of the two strongest aggressors .............2321 mv8 E# c: E5 n0 z8 ~1 J' f- O
** Warning ** Estimate exceeds maximum allowed crosstalk! |
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发表于 2009-12-21 10:07
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