[SI-LIST] Re: PCI-X 1.0a simulation

Having done a significant amount of PCI-X 1.0 simulations in my last
life, I concur with all of the comments so far.  There is a tremendous
difference between driver models for various ASICs even if they are all
consistent with the PCI-X specification.  I also found that not having a
package model (or at least an approximation to start out with) can
severely skew the results to the point that simulating without them is
pretty much a waste of time.

We had to "make do" with an IBIS model from a vendor and they took a
while to get us a version with the package data incorporated into it, so
we did some analysis without it.  When we finally got the full model, we
saw that we had less margin on timing but significantly less transient
overshoot/undershoot. =20

-Chris


>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx] On
>Behalf Of Aubrey_Sparkman@xxxxxxxx
>Sent: Tuesday, December 27, 2005 4:02 PM
>To: weirsi@xxxxxxxxxx; naren.thesia@xxxxxxxxx
>Cc: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: PCI-X 1.0a simulation
>
>Naren,
>Please take another look at the specs.  There are several important
>differences between the PCI spec and the PCI-X spec so I would strongly
>discourage using a generic PCI model for a PCI-X driver.
>
>You can make a buffer model that covers the max and min conditions from
>the spec.  Can you get the package models for your ASIC to use with the
>buffer model?
>
>Most GOOD system houses have faced conditions like this.  You start
with
>the appropriate (PCI VS PCI-X) "spec based" model until your ASIC
>supplier gets their silicon finished and their model working and
>correlated.  Then you continue to use your "spec based" models to test
>for the range of things that can be plugged into your slots.
>
>Good luck,
>Aubrey Sparkman
>Enterprise Engineering Signal Integrity Team
>Dell, Inc.
>Aubrey_Sparkman@xxxxxxxx
>(512) 723-3592
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of steve weir
>Sent: Tuesday, December 27, 2005 6:53 AM
>To: Naren Thesia
>Cc: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: PCI-X 1.0a simulation
>
>Naren,  I am sorry, but I don't see anything here to change my opinion.
>Steve
>At 04:54 PM 12/27/2005 +0530, Naren Thesia wrote:
>>
>>But my ASIC is in development stage.
>>For IBIS mainly two things
>>    * Pin & package parasitics
>>    * VI characteristics of buffer.
>>I have package/pin parasitics of ASIC(Driver).
>>Now I want to take VI characteristics from other device model.
>>The reason behind I am assuming is that PCI output will be standard as
>>PCI specifications.
>>
>>Please let me know about your opinion....
>>
>>
>>
>>
>>On 12/27/05, steve weir <<mailto:weirsi@xxxxxxxxxx>weirsi@xxxxxxxxxx>
>wrote:
>>I wouldn't do that.  Get the driver model.
>>
>>Steve.
>>At 04:22 PM 12/27/2005 +0530, Naren Thesia wrote:
>> >Hi all,
>> >
>> >In my circuit there are two devices PCI-X 1.0a driver and receiver.
>> >I have IBIS model for receiver.
>> >I don't have IBIS model for driver.
>> >
>> >Can I use any generic PCI model for my driver?
>> >Anyone has faced condition like this?
>> >
>> >Thanks in Advance.....
>> >
>> >--
>> >Regards
>> >Naren
>> >
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