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DS90UB964-Q1: DS90UB964-Q1 Equalizer table

Ben Shih
Expert 1220 points
Part Number: DS90UB964-Q1

hi 

How to read the current value of Equalizer for each Camera Port?

  • 0
    TI__Expert 7280 points

    Dear Ben,

    You must first set the port you want to get information from, using register 0x4C.

    Then you can read register 0xD3, EQ_STATUS_1 and EQ_STATUS_2.

    Please close this thread if this answered your questions.

    Thanks,

    Best regards,

    Pial

  • 0 in reply to Pial
    Expert 1220 points

    hi Pial,

    If I want to fill in the read-out EQ value again, what is the sequence? (For every port.)

    The aim is to reduce the time each automatic adjustment.

  • 0 in reply to Ben Shih
    TI__Expert 7280 points

    Dear Ben,

    We typically do not recommend fixing EQ values in our devices, because you won't support cable aging/temp drift if you de-activate the automated equalization.

    What you can do is limit the EQ range after testing your full setup and determining a min and max EQ that would work in your application. That way the equalizer still has some flexibility in case something goes wrong with your link, and can jump to the next value to ensure a continuity of operation.

    I encourage you to read the following application note, describing our margin analysis program http://www.ti.com/lit/an/snla301/snla301.pdf.

    Following the results you obtain with this tool, you'll be able to target the middle of the "eye" and set the EQ floor and max value, as well as the stobe position min/max (registers 0xD5 and 0x41, described in the application note and in the datasheet).

    With this technique you'll improve the lock speed.

    Let me know if that works for you!

    Best regards,

    Pial

  • 0 in reply to Pial
    Expert 1220 points

    Under normal circumstances,
    What is the time from the start to the automatic calibration? Within half an hour or other? How long is acceptable??

  • 0 in reply to Ben Shih
    TI__Expert 7280 points

    Hello Ben,

    Lock time with the equalizer is specified in the datasheet to be less than 22ms.

    Most of the time this is acceptable.

    Best regards,

    Pial