Re: Wanted...PCI bus 3V driver/receiver models

Ben Andresen (andresen@asic.sc.ti.com)
Mon, 26 Feb 1996 17:43:41 -0600

Gary, what you are requesting is in violation of PCI protocol. There can only
be one signaling level on a PCI bus. A universal PCI interface will have
macros that work in either 3V or 5V signaling environments, but they need to
meet all the 3V signaling specs when the PCI voltage is connected to 3V and
all the 5V specs when the PCI bus is connected to 5V. This includes clamping
inputs to the 3V rail in the 3V signaling environment. Anything else is non-
compliant to PCI spec.

FYI, Texas Instruments has several ASIC product lines containing universal PCI
inputs and outputs which ARE fully PCI compliant in both 3V and 5V
environments. If you are interested I can have our marketing department send
you additional information.

Regards,
Ben Andresen andresen@asic.sc.ti.com

> From owner-ibis@vhdl.vhdl.org Mon Feb 26 17:27:12 1996
> To: si-list@silab.Eng.Sun.COM, ibis@vhdl.org
> Subject: Wanted...PCI bus 3V driver/receiver models
>
> I am trying to get a feel for how one might mix 3-volt level signaling and
> 5-volt level signaling PCI bus driver/receivers on a common PCI bus. I have
> IBIS models for 5-volt level signaling driver/receivers from the IBIS
> library courtesy of Intel. I would like to get models that are 3-volt level
> signaling and "5-volt compliant" (I think this just means no VCC clamping
> diode so the parts can be used with 5-volt supply) and models that are
> 3-volt level signaling ONLY (cannot be used with 5-volt supply because they
> have proction diodes?).
>
> I am modeling the behavior of a specific PCI bus design using Quad XTK. We
> will run at 25MHz instead of 33MHz so have more than 10ns for data to settle.
> IBIS models are preferred as they require less trouble on my part to translate
> into useable Quad models (I'm one of those u-s-e-r-s who wants models that
> plug-and-play without any effort on my part...ha). I can use Hspice models,
> if that's all that is available, and will establish non-disclosure agreements
> as necessary to get them. Thanks to any and all who are willing to help.
>
> P.S. I'm placing an order with ZEELAN ASAP in order to get as many
> plug-and-play models as I can afford. I've finally bit the bullet
> and decided I'll have to pay time and $ to get the models I need.
>
> Gary P.
> ---
> Gary D. Peterson
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