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SN65DPHY440SS: MIPI-DSI Interface Troubleshooting

Michael Mock
Intellectual 920 points
Part Number: SN65DPHY440SS

Team,

I am supporting a customer that is using a MIPI-DSI interface to drive an LCD display (sink) over a 22" custom cable. They are running the display from an Intel processor (source).

They are currently using 3 of the MIPI diff pairs (2 data + CLK) (clock is ~290MHz).

As I understand, the display is intermittently going dark (not sure if caused by software or hardware yet but would like to explore hardware setup troubleshooting).

They don't have the equipment to measure an eye-diagram to see if the 22" length is causing them issues.

Do you have any recommendations for troubleshooting this scenario on the hardware side?

They currently don't have the SN65DPHY440SS implemented in the system, but are interested in obtaining an EVM to troubleshoot and test for a performance improvement. Any recommendations you can provide would be appreciated.

Thanks.

  • TI__Guru 64326 points
    Mike,

    In order to troubleshoot this setup we suggest looking at the power losses from the Transmitter to Receiver (Source to Sink). This can be calculated by analyzing the schematic and PCB layout or estimated from a block diagram of the system. We suggest this as your first step as your issue, initially, seems to be with the signal integrity of the system. Here is a resource for High Speed Layout guidelines that could help with finding losses on PCB layouts: www.ti.com/.../scaa082a.pdf

    Is the SN65DPHY440SS in the system currently or is there a issue tuning this device for the system? If not this this device will help to boost the signal integrity of the system.