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DS90UB954-Q1: AEQ Settling

Tim Lipsky
Prodigy 230 points
Part Number: DS90UB954-Q1
Other Parts Discussed in Thread: ALP

Hello,

I am using the DS90UB954/953 with 10 meters of 50 ohm coax  in CSI non-sync mode running a single channel of 1080p60(10-bit bayer data).   The system is working nicely but we are seeing glitches(LOCK is negating) every few seconds and slowly gets better over the first 5 minutes and slowly stabilizes to a fairly solid video stream with a glitch every 1 hour or so.

This suggests to me the '954's AEQ is still slowly adapting over the first 5 minutes and may not be ideally adapted to our cabling.   Our coax setup is not ideal with the 4 points of connectors in the cable run.

Is there some process that can be done at startup to help the AEQ adapt the best?

Any other thoughts?

Thanks,

Tim

  • 0
    TI__Mastermind 21685 points

    Tim,

    We have a margin analysis program (MAP) tool in the ALP which will show you how much margin you have across EQ and strobe position (SP) settings in your actual system.

    You need to install both the latest ALP framework (if you don't already have it) and ALP-PROFILE-UPDATE to use the margin analysis tool:
    http://www.ti.com/tool/alp

    The MAP sweeps over all possible EQ and SP settings and shows recommended EQ levels (green shaded) with at least four passing strobe positions. You can then program the AEQ_MIN_MAX value based on MAP recommended EQ levels. That way 954 AEQ adapts faster to the optimum value.

    Note this is a diagnostic tool to check cable condition and link, so run MAP with ALP connected to your system over I2C and imager/SOC disconnected. There's going to be an app note on MAP tool soon on the web.

    Thanks,
    Vishy