topic Re: PCIe data transfer rate in Layerscape

PCIe data transfer rate

SrinivasP — Mon, 17 May 2021 05:22:37 GMT

I want to get clarified on PCIe transfer rate (or Baud rate) in LS1043A I.MX8Q. As per PCIe spec and generation a specified transfer rate is mentioned (2. GTps , 5 GTps etc). Is this transfer rate fixed or can we configure any transfer rate below the maximum specified rate.

Re: PCIe data transfer rate

ufedor — Mon, 17 May 2021 06:19:16 GMT

> Is this transfer rate fixed

The PCIe link rate is fixed.

Consider that data is transferred through this link in packets, so resulting data rate can vary.

Re: PCIe data transfer rate

SrinivasP — Mon, 17 May 2021 09:32:30 GMT

Thank you for the reply. As I understand (If I am not wrong) , you mean that the data (Packet) is transferred over the PCIe link at a rate of of 2.5 GTps or 5 or 8 GTps (based on PCIe generation).

If my understanding is right, can be use cables from one backplane to other , to transfer data over PCIe at this rate. Are there any specialized cables for this purpose.