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DM365 VENC Delay

Kaustubh Patankar
Prodigy 85 points

Hi

I am working on DM365 setup where it is expected to out YCC8 data (576i-PAL). There seem to be delay between H-SYNC and the data lines. The data lines are not sync with the falling edge of H-SYNC signal. Is it expected behaviour? Is there any refernce or documenation for this?

Please help

regard

KP

  • 0
    TI__Mastermind 19985 points

    Hi Kaustubh,

    PAL standard has a back porch of 8 micro-second. Is the delay that you mentioned from HSYNC to valid data, equivalent to this 8 micro-second? As we had discussed offline, you should be able to take care of this no-data region by ignoring it in your capture device.

    Regards,

    Anshuman

    PS: Please mark the post as verified, if you think it has answered your question. Thanks.

  • 0 in reply to Anshuman Saxena
    Prodigy 85 points

    Hi Anushman,

    Yes i agree with you. We have observed the time between HSYNC and the data pattern to be approximately 5-6 micro sec. This seem to be in line with the information provided by you. 

    When investigated further the problem seem to be in-consistent data between HSYNC. We are generating fixed pattern at the DSP output port. Can you confirm the following settings if they are correct? 

    Requirement - 576i/50, BT656, YCC8 pattern.

    Current register settings.

    (VENC_VMOD, 0x00001243);
    (VENC_VIDCTL, 0x6000);
    (VENC_SYNCCTL, 0xF);
    (VENC_LCDOUT, 0x1);
    (VENC_VINT, 0x259);
    (VENC_HINT, 0x06BD);  
    (VENC_HSTART, 0x11E);
    (VENC_VSTART, 0x18);
    (VENC_VSPLS, 0x18);
    (VENC_HSPLS, 0x11E);
    (VENC_VVALID, 0x120);

    (VENC_HVALID, 0x5A0);

    Where HINT+1 = 1726, V-start - 24, HVALID - 1440, HSTART - 286, VINT+1 - 601, VVALID - 288

    regard

    KP