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agula's avatar
agula
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

PCIe Stratix 10 Avalon ST

Hi All, How does the credit tracking interface operate ? The tx_nph_cdts[7:0] signal in particular. How does this signal work. Does it report how many credits are available to the application fo...
agula's avatar
agula
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

Hi,

Thanks for the response. I am still a little unsure on how the RTL code provided in the user guide works.

For example the credit limit that is computed in the Appendix RLT is tx_nph_cdts_limit[7:0].

What does this value signify ? Is it the credit limit from the RX_buffer_space equation ? If so how do we calculate credits restored ?

I have tried using tx_nph_cdts_limit[7:0] directly and only send out non posted requests if it is greater than 0, but it will get stuck and no longer send requests outs.