[SI-LIST] 答复: IBIS question

Which simulation deck do you use?

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=B4=FA=B1=ED Stephane Tremblay
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=D6=F7=CC=E2: [SI-LIST] IBIS question

Hi SI-Listers,
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       I am using a DDR IO buffer that has not been designed in-house. =
The
macro provider did provided us with an IBIS model for the Termination =
AND
another IBIS Model for the IO itself (since there is active termination =
on
DDR2). Since the two are connected on the same PAD at the die level, I =
did
the same on the simulation deck. By doing so, I got nasty sim results =
and
after investigation I realized that Package info was present on both =
IBIS
models.=20

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As I think I am a smart engineer, I tried to decoupled the package info =
from
the actual two IBIS models that I have, but I don't get the same results =
if
I put the parasitic outside the IBIS vs. inside the IBIS.=20

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Anyone has a clue why?=20

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How do I get Package Parasitic outside the IBIS? Just setting RLC =
discrete
values outside did not reproduce the same sim.

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Here is the Parasitic I need to separate from my Model:

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[Package]

| variable       typ                 min                 max

R_pkg            0.58                0.48                0.68

L_pkg            5.80nH              4.10nH              7.50nH

C_pkg            0.58pF              0.51pF              0.65pF

|

=20

Thanks,

Steph.



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