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SN65DSI86: Using the Bridge as DSI to DisplayPort (not eDP)

Peter Lischer
Prodigy 30 points
Part Number: SN65DSI86
Other Parts Discussed in Thread: TEST2

Tool/software:

We want to use the SN65DSI86 to bridge the MIPI DSI interface to a DisplayPort output. According to the datasheet, the SN65DSI86 is a DSI to eDP bridge. The DSI to DisplayPort function is not mentioned. As far as I know, eDP and DisplayPort are quite similar. A DisplayPort jack is also available on the SN65DSI86's reference board. I am now wondering if are there any issues using the bridge for adding a DisplayPort interface to our system. We do not need embedded audio. 

What are the differences between eDP and DisplayPort? Why is the SN65DSI86 marked as DSI to eDP bridge without mentioning the function as DSI to DP bridge?

  • +1
    TI__Guru**** 177396 points

    Hi,

    DSI86 is designed with ASSR enabled by default to support the eDP panel. Most DP monitors or panels do not support ASSR. To support DP monitors, DSI86’s ASSR will need to be disabled by making ASSR_CONTROL read/write instead of read-only. The first step to make ASSR_CONTROL read/write is to make sure TEST2 pin is be sampled high at the rising edge of EN pin. It is recommended to pull TEST2 pin to 1.8V thru a 1k to 10k resistor. Once TEST2 is high, the following steps must be performed:

    1. Write 0x07 to register 0xFF. This will select Page 7.
    2. Write 0x01 to register 0x16. This will make ASSR_CONTROL to be read/write.
    3. Write 0x00 to register 0xFF. This will select Page 0.
    4. Write 0 to bits 1:0 at register 0x5A. This will change from ASSR to Standard DP.

    Thanks

    David