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SN75DPHY440SS: SN75DPHY440 lanes compatibility for CSI

Mike Wang2
Intellectual 2760 points
Part Number: SN75DPHY440SS

Hi team,

my customer is using SN75DPHY440 for CSI-2 camera application. they want to use Lane0/1 for 2 lane CSI configuration.

Looks our Lane0 is different from others, mainly for LP states. could you please check whether it's OK to use lane0?

thanks,

Mike

  • 0
    TI__Mastermind 18655 points
    Hello Mike,
    Lane 0 supports DSI LP Backchannel. So, theDPHY440’s LP TX will expect to connect to an unterminated LP RX. With Lane 0 path (DA0P/N and DB0P/N) supporting bi-directional LP signaling, it is very important that DB0P/N LP TX is connected to an unterminated LP RX. If DB0P/N LP TX is connected to an HS RX, then LP signaling will not be able to reach the LP11 levels and which will cause the DPHY440 to not enable HS data path on Lane0.
    The DPHY440 may enable LS backchannel.
    Enable HS path for Lane 0 only:
    Write Register 0x50 with 8’h01 //Override enable for HS TX path
    Write Register 0x51 with 8’h01 //HS TX path enabled.
    Write Register 0x61 with 8’h00 // Disable LP path.
    Write Register 0x70 with 8’h01 //Override enable for HS RX path
    Write Register 0x71 with 8’h01 // HS RX path enabled.

    Regards