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Original question:

DS90UB962-Q1: 962 compatible with 933 and 935

DS90UB960-Q1: time latency from 935 input to 960 output

Elec Cheng
Expert 7055 points
Part Number: DS90UB960-Q1

Hi Expert,

I see some e2e post explaining the latency from Ser to Des-ser, like below link. The main cause is the DES video buffer, addling max 2x the line time. But I just hear from my colleague that it will also take some time to lock, and the time counts for the latency in video transmission. Do you have any idea of that? Thanks.

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/860039/faq-ds90ub953-q1-latency-of-ds90ub953-q1-and-ds90ub954-q1/3180910?tisearch=e2e-sitesearch&keymatch=954%25252520latency#3180910

BR,

Elec Cheng

  • 0
    TI__Genius 16230 points

    Hi Elec,

    Correct, we need some time to lock and this is dependent on system. Below is the spec that includes the typical value for lock time.

    Glenn 

  • 0 in reply to Glenn Uranga
    TI__Expert 7055 points

    Hi Gelnn,

    Just double confirm with you, will the lock time account for the video time delay during normal working? That is to say, when I am calculating the time latency from 935 input and 960 output, should I add lock time also? In the e2e link I attach above, he doesn't mention this. So I am not sure. Nee your help to confirm. Thanks.

    BR,

    Elec Cheng

  • 0 in reply to Elec Cheng
    TI__Genius 16230 points

    Hi Elec,

    On the previous E2E you referenced he is assuming the system is lock and stable. The time it takes for video to come into the ser to the des is small enough no impact significant impact on the system. From des to the SoC is what is the previous E2E is indicating worse case is 2x time the line period.

    If you want to take consideration, please look at the power up sequence in the datasheet that explains timing. This lock time, VDD power up, Etc. 

    Glenn 

  • 0 in reply to Glenn Uranga
    TI__Expert 7055 points

    Hi Glenn,

    Glenn Uranga said:
    On the previous E2E you referenced he is assuming the system is lock and stable. The time it takes for video to come into the ser to the des is small enough no impact significant impact on the system

    So if the lock is stable and  I want to calculate delay time, now we don't need to take lock into consideration, right? Thanks.

    BR,

    Elec Cheng

  • 0 in reply to Elec Cheng
    TI__Genius 16230 points

    Hi Elec,

    Correct, if you are locked and stable, you don't need to take lock time into consideration.

    Glenn