[SI-LIST] Re: Cref and Rref -Ibis model vs datasheet
- From: "Weston Beal (wbeal)" <wbeal@xxxxxxxxxx>
- To: "kbmanick@xxxxxxxxx" <kbmanick@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 9 Dec 2013 15:49:34 +0000
Yes, the timing reference load parameters - Vmeas, Cref, Rref and Vref - in the
IBIS file should be the same as those given in the device data sheet. These
parameters do not affect the simulation with the IBIS model, but are crucial to
the correct timing analysis. Your simulator should use the timing reference
load to calculate a derated or compensated flight time for each net simulated.
Use this adjusted flight time along with the driving device output timing to
calculate the bus timing. The documentation or technical support of your SI
simulator should give you more details about how to use the adjusted flight
times.
Weston
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Balamanikandan K
Sent: Monday, December 09, 2013 3:31 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Cref and Rref -Ibis model vs datasheet
Hi,
This is regarding ibis model parameters.
The parameters Vmeas, Cref, Rref, Vref are optional
–Ref: Page No 47, Table 5.3 – IBIS [Model] Sub parameters, IBIS MODELING
COOKBOOK For IBIS Version 4.0
The datasheet of a particular device mentions timing measurements against some
specific loading which is different from its ibis model Cref and Rref . In this
case can one edit the Cref and Rref in the ibis model to match datasheet’s
loading values so that timing values specified in datasheet can be used in the
timing model of Signal Integrity simulation tool ?
--
Best Regards,
Balamanikandan.K
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