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pcipci-bus
Shabbir Hussain
Shabbir Hussain

Reputation: 2720

Is PCI 3.0 compatible with PCI 2.1?

I upgrade my cPCI board to an adlink-3970 (PCI 3.0). The machine boots up to windows, all the drivers are installed correctly including the my PCI 2.1 device's driver (meaning the CPU was able to read the ROM over the PCI bus). However, when I try reading data from my PCI 2.1 device, all the registers read 0. Are these two boards not compatible?

More info: I've read that they should be compatible and the electrical/mechanical specs indicate that they are. I've also tried swapping in for another CPU board but with the same results. The only difference in the upgraded board is that the CPU uses a PCIe-PCI bridge to communicate on the PCI bus. I'm wondering if that's the issue.

Upvotes: 0

Views: 242

Answers (1)

pumpkin_cat
pumpkin_cat

Reputation: 1256

PCIe is backward compatible. A PCIe3.0 card will work on a PCIe2.0 slot.

Upvotes: 1

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