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TPS65988: TPS65988EVM connects TPS65987-90EVM to transmit DP signal

Peggie
Intellectual 445 points
Part Number: TPS65988
Other Parts Discussed in Thread: TPS65987,


I follow the User's Guide to test the DP signal output. My test environment is as follows
1. Connect the computer HDMI port to the DP port of the TPS65988EVM using DP to HDMI.
2. Connect the TPS65988EVM to the TPS65987-90EVM using the Type-c to Type-c cable.
3. TPS65987-90EVM is connected to the 10G-EXPANSION-EVM Sink Board, and the MINI DP port is connected to the monitor using MINI DP to HDMI.
4. Configure TPS65988EVM as DRP and TPS65987-90EVM as UFP
The indicator light on the EVM seems to be correct. The power supply can be output to the TPS65987-90EVM, but the monitor has no screen display, and the waveform I measured is not the same as the EVM waveform. It seems that CC1 and CC2 are different.
I want to know what the reason is. Is the problem of hardware connection, or the problem of software configuration. Is there any configuration file to give me a reference?

  • 0
    TI__Expert 7910 points

    You need to configure the DP Capabilities registers (0x51) correctly on the TPS65988EVM (config as DP source) and on TPS65987_90EVM (config as DP sink).

    If you are using standard template in the GUI the TPS65988 0x51 register should look as - 

    On the TPS65987_90EVM the register should look as -