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DS90UB940-Q1: input data format in CSICFG1 Register

Ryan Wang
Expert 7425 points
Part Number: DS90UB940-Q1

Expert,

For CSICFG1 Register of DS90UB940 datasheet,

IFMT: Program the input data format in HDMI terminology.

00: RGB444
01: YUV422
10: YUV444
11: RAW

Questions:

1. Why input data format is only in HDMI terminology? Can 940 talk to 941(only 949/929 support HDMI)?

2. From 941 side, DSI_BYTES_PER_PIXEL should be written to match IFMT of 940, right?

3. If config IFMT as RGB444, how to configure DSI_BYTES_PER_PIXEL of 941? how to configure OFMT of 940?

  • 0
    TI__Mastermind 36920 points

    Hi Ryan,

    The UB940 should be able to support 941, 947, 949 or any back compatible devices. The UB940 automatically detects the incoming video format from the datastream. Then it generates CSI-2 output timing parameters based on for example RGB666, RGB888, and RGB565 format.

    I am not sure if I understood your question 3. RGB444 is RGB888; so, if you are using DSI as an input source. The format should be RGB888. The RGB44 is mainly used terminologies for HDMI.

    Hope this helps. Let me know if you have additional questions.

    Aaron

  • 0 in reply to Aaron Heng
    TI__Expert 7425 points

    Great thanks, Aaron