[solved] PCI, PCI64, PCI-X, looking for an expert

[legacy]

looking for experts with skills on the old (1992-2004) PCI bus, specifically, I have problems at mastering the differences between PCI64 and PCI-X.

I have a bunch of PCI-X cards installed into PCI64@33-66Mhz that are showing weird behavior on cerctain RISC workstations, so I have the feeling that it's not an isolated case.

Anyway, the first question is: has anyone ever tried to ground the PCIXCAP pin, in order to force the chip on the PCI-X card to believe that it's a *PCI canonical being* rather than a *PCI-X being* ?


edit:
solved, checked the motherboard: 100% compliant, the PCIXCAP pin is OK
so I checked the software: bingo, a wrong barrier has been found, and fixed!

[dexters_lab]

iirc pci-x was faster clock, maybe your cards don't like being operated at the lower speed and it's affecting some of the internal timing on the card? 

[legacy]

I think this is a difficult task without a PCI bus analyzer, anyway.
Perhaps, I will buy one