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How to generate 64-bit transfer?

To: pci-sig@znyx.com
Subject: How to generate 64-bit transfer?
From: Taliaferro Smith <TollyS@Lewiz.com>
Date: Mon, 11 Jun 2001 04:51:31 -0700
Resent-Date: Mon, 11 Jun 2001 04:58:28 -0700
Resent-From: pci-sig@znyx.com
Resent-Message-ID: <UtdDY.A.DtG.W_KJ7@electra>
Resent-Sender: pci-sig-request@znyx.com

I have an STL2 motherboard with PIII and the ServerWorks ServerSet III
LE Chipset containing
the NB6635 North Bridge 3.0 LE.

I'm attempting to read a 64 bit register from a 64/66 PCI Card in a
single 64-bit transfer.
I used the mmx  movq instruction.
I'm getting two 32-bit reads in a single burst.
I never see Req64 go low.
I also tried the FILD floating point instruction.

What am I doing wrong?
Does this chipset support 64-bit transfers, or only with the card as
master?

Thanks,

Tolly Smith
LeWiz Communicaions
TollyS@Lewiz.com

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