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Altera_Forum
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17 years ago

PCI Express:Max_payload_size and lane width

i have design a X4 pcie endpoint device based on Quartus pci express ip V7.2. when i plug the device to the x16 pice slot of my dell optiplex 620 host, the device can only be recognized as an ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

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Seaman, did you resolve the x1 vs x4 issue? I am facing the same proble with an x8 pcie core. When I plug it into x16 pcie slot of my dell optiplex 775 host, the device is recognized as an x1 pcie deivce.

thanks

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Look at the datasheet of your Intel Chip. You'll see that some chipsets support either x16 or x1 but not x4. Intel 965 Chipset Does support x4 in x16. Intel 945 doesn't.