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Altera_Forum
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14 years ago

PCIe problem with large TLPs

I'm sending a TLP (from the application layer) of 4 headers and 128 bits of data (Avalon-TX 128). Headers look like this: header0 = 32'h60000004; //fmt = 3, length = 4 DW header1 = 32...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

The PCIe spec says:

--- Quote Start ---

• For Addresses below 4 GB, Requesters must use the 32-bit format.

--- Quote End ---

So, in your TLP generator you have to check the upper 32 bits of the address to be zero and use a 3 word TLP in this case.