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Altera_Forum's avatar
Altera_Forum
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14 years ago

Problems with SGDMA through PCIe in several motherboards

Hi All, We have finalized a project for high speed video transfer. It applies a PCI Express Gen1 4x interface between the digital HD video input and central RAM of an x86 based computer. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

We had a lot of problems with (I think) the PCIe physical layer repeatedly resetting. Single slave transfers worked - but very, very slowly (even slower than when it is working 'properly'), under the same conditions a longer burst transfer could quite possibly get retried for almost ever.

Don't know if this was a hardware SERDES(?) issue or was fixed by changing some of the PCIe parameters at one of the ends (on pcb link to a small ppc).