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AM5728: VPDMA descriptors

Yan Yandoff
Intellectual 330 points

Part Number: AM5728

Hello!

I have TRM for AM5728 (spruhz6l.pdf). I loot at the section 10.3.9.6.1 Data Transfer Descriptors and see table Figure 10-49. Inbound Data Transfer Descriptor Format. I can not find information forWord 5, Word 6 and Word 7. I understand that some of the information has not been added? Where can I find information?

Thanks!

  • 0
    TI__Guru**** 393215 points
    Hi,
    Your query has been assigned to a TI engineer. Please note that response may be delayed due to Christmas and New Year holidays.
  • 0 in reply to Biser Gatchev-XID
    TI__Prodigy 130 points

    Here is the description for WORD5:

    Horizontal Start
    Bits 31:16 are the horizontal start location for the channel data. This value is used to control where the
    data starts for a channel so that blank segments may be inserted into the row. This is used for region
    based graphics. This field is reserved for outbound data. For non-graphics clients this MUST be set to 0.


    Vertical Start
    Bits 15:0 are the vertical start location for the channel which allows the channel to be spaced vertically
    from the previous channel or the top of the frame. This is used for region-based graphics. This field is
    reserved for outbound data descriptors. For non-graphics clients, this MUST be set to 0.

    For Sitara device (which does not include Graphics client on the VPDMA), I believe values on this word are not used.

    But, to be safe, the WORD5 should be set to 0.

    For word6/7, these are again for the Graphics client (not included in the Sitara).  Values on these words are unused.

    Regards,

    Brian