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DS90UB964-Q1: No image output

Kai Hsiao
Guru 12675 points
Part Number: DS90UB964-Q1

Dear Sir 

I am debug-ing DS90UB964 for 2 serdes camera and sometimes the image have no output  

1. The fail and pass condition register as below ,do you have any idea how to solve this issue 

2. What's parity error's mean ?? you can see below register 0x56

When the image output normally ,it still have parity error [0x56] = 0x03 ,is it correct ??

3. what's condition will have Packet Buffer error ??

4. Pass file and fail file as below ,if have any setting is not correct ,please kindly let me know 

964 Setting file.rar

  • 0
    TI__Expert 8165 points

    Hi Kai,

    I will be reviewing your register settings in the next couple of days.

    Regards,

    Davor

  • 0
    TI__Expert 8165 points

    Hi Kai,

    Have you checked if the 964 is losing lock? Check LOCK_STS field in the register 0x4D.  You may also want to bring the lock signal out on a GPIO.

    The loss of lock may indicate issues with signal integrity, reference clock, power over coax, system noise.

    You may also check your system initialization:

    a) Once the serializer is powered up and at the operating frequency, apply digital reset(without resetting registers) to the DES. This will allow for consistent startup behavior of the link.

    b) During this time period while lock is low (~30ms) do not attempt remote I2C writes across the backchannel. In general we recommend monitoring lock to avoid sending I2C when lock is low.

    c) Once lock is established clear the backchannel CRC counter, clear forward channel error count registers (0x4D and 0x4E)

    Regards,

    Davor.