[SI-LIST] Re: different Vmeas for Rising/Falling
- From: "Moran, Brian P" <brian.p.moran@xxxxxxxxx>
- To: "Moran, Brian P" <brian.p.moran@xxxxxxxxx>,"Mirmak, Michael" <michael.mirmak@xxxxxxxxx>,<diggidydog2003@xxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 8 Apr 2003 10:10:38 -0700
Sorry about replying to all. I only saw three names on the return line =
and didn't realize one was the SI-list. Didn't mean to clutter up your =
inboxes.
Brian P. Moran
Signal Integrity Engineer
Intel Corporation
brian.p.moran@xxxxxxxxx
-----Original Message-----
From: Moran, Brian P=20
Sent: Tuesday, April 08, 2003 10:05 AM
To: Mirmak, Michael; diggidydog2003@xxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: different Vmeas for Rising/Falling
Douglas,
I never had to use different Vmeas for rise and fall however. But once =
you have the independednt measurments you can do this. Ther eis no way =
to do it within IBOIS however.
Brian P. Moran
Signal Integrity Engineer
Intel Corporation
brian.p.moran@xxxxxxxxx
-----Original Message-----
From: Mirmak, Michael [mailto:michael.mirmak@xxxxxxxxx]
Sent: Tuesday, April 08, 2003 9:11 AM
To: diggidydog2003@xxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: different Vmeas for Rising/Falling
=20
Douglas,
=20
If you are using IBIS 3.2, this will probably be an adjustment you have =
to conduct manually within your specific simulations. IBIS 3.2 does not =
distinguish between rising and falling Vmeas values, though some tools =
may provide this calculation independently of IBIS.
=20
IBIS 4.0, on the other hand, does support separate Vmeas values, as well =
as separate load fixtures, for rising and falling edges through the =
[Model Spec] keyword.
=20
- Michael Mirmak, Intel Corp.
-----Original Message-----
From: SI Eng [mailto:diggidydog2003@xxxxxxxx]
Sent: Tuesday, April 08, 2003 8:52 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] different Vmeas for Rising/Falling
Gurus :
I'm wondering how to account for different Vmeas
points for Falling vs. Rising edges when doing timing
calculations. IBIS only specifies a single Vmeas
point, and ICX doesn't provide an extension for this.
I don't know about XTK or the other tools.
The SI tools will report delays based upon the
worst-case for Rising and Falling edges referenced to
the same Vmeas point. This result is incorrect for the
edge with the wrong Vmeas.
Does the measurement have to be done manually in this
case (i.e waveform delta) ?=20
Thanks,
Douglas
______________________________________________________________________
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