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How to generate 64-bit transfer?

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


Tolly Smith
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