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C674x : UPP transfer size

laurent poyart1
Prodigy 30 points

Hi,

I'm going to use C6748 DSP interfaced to a FPGA for sampling chain through the UPP interface.

Can anyone confirm that all the data transfer need to be a multiple of 64 bytes?

It seems to depend on the TXSIZEA/B and RDSIZEQ/I configurations (sprugj5b).

This issue is important when considering discontinuous samples flow.

Regards

Laurent.

  • 0
    Prodigy 90 points

    From the experience I have had with UPP, the total transfer size doesn't need to be a multiple of 64 bytes, but it does need to be a multiple of 2 bytes.

    If you are asking about a total transfer size less than 64 bytes that might be different, I believe there is a good discussion about that on this web forum somewhere.

  • 0 in reply to Matt M
    TI__Intellectual 1585 points

    Hi Laurent,

                The DMA burst size is 64 bytes or larger, but smaller transfer sizes are allowed.  Similarly, the DMA line size does not need to be divisible by 64.  It has been tested for transfer sizes as small as 4 bytes without issue.

    Regards

    Iyshwarya

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