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DS90UB964-Q1: in the Line-Concatenated Forwarding mode, can't preview the camera sensor data

michael chen49
Prodigy 160 points
Part Number: DS90UB964-Q1

Hi Tier,

I have two question for this chip debug:

1 the Round Robin mode is used and format register's 0x71 bit 7/6 are set 00. RX0 and RX1 use same virtual channel id. we can get camera data and preview picture;  But in this mode, according datasheet's decription, its request is different virtual id. We get blink picture. two camera pictures are overlapping. Could you please explain this situation?

2 in the Line-Concatenated Forwarding mode, Rx0 and Rx1 can use same virtual channel id, the senor data format register value is 0x2c, and enable line-concatenated forwarding mode by the register 0x21.

I'm sure that sensor data format regiser 0x71 and CSI0_SYNC_FWD 0x21 are written rightly. in this situation, our SOC MIPI combo can't get right sensor data format 0x2c. it can't process data, so we can't preview camera data. Could you please expain this?

  • 0
    TI__Genius 10475 points
    Hello,
    Just acknowledging that we received your question and this has been assigned for review and response.
  • 0 in reply to Palaniappan Manickam
    Prodigy 160 points

    Hi Tier,

    Thanks.

    Michael

  • 0 in reply to Palaniappan Manickam
    Prodigy 160 points
    Hi Tier,

    Is there any feedback?

    Thanks.

    Michaelchen
  • 0 in reply to Palaniappan Manickam
    Prodigy 160 points
    Hi Tier,

    For second question,

    I check MIPI signal and ds90ub964 is not able send camera data to our SOC. If we set 0x21=0x03, we are able to preview camera picture, but we set 0x21=0x0c, we are not able to preview camera picture. only difference is register value 0x21 between them. Could you please help us to fix this? Thanks a lot.

    B.R.
    Michaelchen.
  • 0 in reply to michael chen49
    TI__Mastermind 30515 points

    Michael,

    Sorry I can't understand your issues well, but please note:

    1. for RR mode, it is best-effort to map FPD-Link input data to CSI2 output. No special ordering of CSI-2 packets are specified, effectively relying on the VC identifier to distinguish which camera. You should have VC to identify it. or they are overlapped.

    2. for Line-Concatenated Forwarding mode, pls see d/s description in page35 for details.

    8.4.19.4 Line-Interleave Forwarding
    In synchronized forwarding, the forwarding engine may be programmed to send only one of each synchronization
    packet. For example, if forwarding from all four input ports, only one FS, FE packet is sent for each video frame.
    The synchronization packets for the other 3 ports is dropped. The video line packets for each video stream are
    sent as individual packets. This effectively merges the frames from N video sources into a single frame that has
    N times the number of video lines.
    In this mode, all video streams must also have the same VC, although this is not checked by the forwarding
    engine. This is useful when connected to a controller that does not support multiple VCs. The receiving
    processor must process the image based on order of video line reception.

    best regards,

    Steven