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DS90UB954-Q1: Color bar setting screen failure

Part Number: DS90UB954-Q1
Other Parts Discussed in Thread: DS90UB953-Q1,

Hi all,

My customer is using DS90UB954-Q1+DS90UB953-Q1 for a camera project, now they have encountered a color bar issue:

The connection link: camera sensor→953→954→isp→video ic→display;

The current phenomenon is:
1. Sensor and 953 are not disconnected: 954 does not lose the lock, the lock is high, and the screen is blurred;
2. Sensor+953 are all disconnected: 954 loses the lock and the lock is low, and the screen is blurred;

When the camera is connected, the software has been configured in accordance with the prerequisites of the Pattern Generation specification (below) and the 7.5.11.4 reference code. I would like to ask how to locate this problem and whether there is a problem with the software register configuration? Thank you!

  (no camera sensor and no 953 connection)

  • Hi Zirui,

    Could you select the RX port (reg 0x4C) and check the following registers (a couple times, some registers are clear-on-read)? I would also suggest read reg 0x73 - 0x76 to check the video resolution.

    Register

    Types of Errors

    Comments

    0x4D

    Status

    0x4D[5]: indicates CRC (BC) error detected

    0x4D[2]: indicates parity (FC) error detected

    0x4D[0]: indicates whether there's lock

    0x4E

    Status

    0x4E[5]: indicates encoder error detected

    0x4E[4]: indicates buffer error detected

    0x4E[3]: indicates CSI error detected

    0x56,0x55

    Parity

    0x56: upper 8 bits of parity error count

    0x55: lower 8 bits of parity error count

    0x7A

    CSI Error

    indicates various CSI errors

     0x7B

    CSI Error

    indicates number of CSI packets with errors

    Best,

    Jiashow