Forum Discussion

Matt1's avatar
Matt1
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

mSGDMA : Transfer length value

hello ,

In the Embedded Peripherals IP User Guide under msgdma maximum transfer length , it is mentioned that "With shorter length width being configured, the faster frequency of
mSGDMA can operate in FPGA".

What is the reason behind this comment?

Is it related to the FPGA implementation or is it related to the transfer rate(not to keep the bus busy for longer time)?

Is there any comparison results for the different "Transfer Length" during the mSGDMA transfer?

is there any best value for the Transfer Length?

3 Replies

  • EBERLAZARE_I_Intel's avatar
    EBERLAZARE_I_Intel
    Icon for Regular Contributor rankRegular Contributor
    5 years ago

    Using smaller length improves the frequency of the mSGDMA,

    The maximum transfer length is the maximum number of bytes transferred by each descriptor.

    We do not have the comparison numbers and best values.

    • Matt1's avatar
      Matt1
      Icon for Occasional Contributor rankOccasional Contributor
      5 years ago

      thank you for your valuable response.

      "Using smaller length improves the frequency of the mSGDMA, "

      I wish to understand a bit more about the above statement. Can you please elaborate?

      just for my understanding...Increasing in frequency means increase in throughput? is that you mean?

      what is actually confusing me is as you mentioned there is no transfer length comparison results available to compare the throughput .

      please correct me if I am wrong.

      • EBERLAZARE_I_Intel's avatar
        EBERLAZARE_I_Intel
        Icon for Regular Contributor rankRegular Contributor
        5 years ago

        Hi,

        Increasing in frequency will result higher performance, not higher throughput.