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Altera_Forum
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15 years ago

PCIe freezing

Hi, I have strange problem with PCIe IP. I have a custom board with ArriaGX and PCIe instantiated using MegaCore flow with AvalonST interface. The PCIe works (there are some DMAs running, targe...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi Matthias,

In altera datasheet to the IP core is written that "PCI Express endpoints must offer an infinite number of completion credits", I don't know if it is also rule for root devices, but there is also mentioned, that "When infinite credits are available, the corresponding credit field is all 1's". So all zeroes does really mean zero credits available. Could this be a problem? When I do not issue writes too much fast, the device works with a problem - there are reads/writes and dma read/writes running without any problem - so posted, nonposted transactions and completions are issued on both ends. Just when I issue big bunch of "target writes" from the PC, it freezes...

Martin