Re: PCI on AGP

[Johannes Steigerwald <hannes.steigerwald@ops.de> (by way of Daniel Weaver <danw@znyx.com>)]

We put a PCI-only device on the AGP to benefit from 66 MHz Clock rate.
The Config-Regs were just as in the PCI spec for any 'normal' PCI
device. No capacitance pointer. Phoenix-BIOS had no problems configuring
the device in a 440BX motherboard. The card worked flawlessly at more
than the expected throughput.
By the way, if you target your card to AGP only (not 66MHz PCI) you do
not have to meet the strict 66MHz PCI timing requirements. AGP timing is
much easier to meet.

Hope this helps,
Johannes

masao wrote:

> Hi all,
>
> I'm designing a PCI 66Mhz compliant which will be connected to AGP
> of 443BX.
> The device doesn't have any AGP functions but should initiate
> mem read or mem write as a target.
> Does anyone know how the configuration regs values should be
> determeined?
> For example should it have CAP_PTR to point AGP list even if it has
> just a PCI interface?
>
> Thanks in advance.
>
> Masao.Y
>
> masao_y@yc4.so-net.ne.jp

--
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|Johannes Steigerwald               | Océ Printing Systems GmbH, OPS TEC35|
|phone:   +49-8121-72-4912          | Siemensallee 2                      |
|fax:     +49-8121-72-3173          | D-85586 Poing - Germany             |
|email:   hannes.steigerwald@ops.de | www.oce.com                         |
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