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leonqin_2025's avatar
leonqin_2025
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3 months ago

Why AXI MCDMA IP output axi-stream with Spares TKeep and borken TData?

as described in datasheet,"The sparse tkeep is not allowed."

but,I got the wave by signaltap:

why?

5 Replies

  • RongY_altera's avatar
    RongY_altera
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    3 months ago

    Hi,

    The "sparse tkeep" means a pattern like 8'b10101010.

    A tkeep like 8'b00001111 is considered contiguous.


    Regards,

    Rong


    • leonqin_2025's avatar
      leonqin_2025
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      3 months ago

      Thanks for your reply!

      but in UG-817911,"The invalid bytes are allowed only during
      h2d_axi_st_tlast cycle" means that it allowed ONLY at last cycle?

  • RongY_altera's avatar
    RongY_altera
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    3 months ago

    Since there are several modes in MCDMA IP, could you please send me your mcdma.ip and let me know the Quartus version you're using?

    I'll check this from my end.

    Thanks,

    Rong

      • RongY_altera's avatar
        RongY_altera
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        25 days ago

        You can paste a download link here.  This is so far the way to share a file.

         

        Regards,

        Rong