2 Replies Latest reply on Apr 9, 2020 6:39 AM by KyTr_1955226

    CY4531: Use as Type-C to DP (with PS8742B Mux Replacement)




      I have a question regarding the CY4531 CCG3 EVK, and the conversion from a Source device to a Sink device via replacement of the PS8740 Mux.

      (see thread here:Can the CY4531 Evaluation Kit be used as a Client as opposed to a Host?).


      As per that thread, I replaced the PS8740 with a PS8742B on the CY4531 baseboard.

      I also modified the CCG3 firmware (disabled DP_DFP_SUPP and added a #define for DP_UFP_SUPP As suggested here).


      I have the USB-C source (a CY4541) successfully powering the CY4531, but I'm hoping to also pass over the DisplayPort video coming from the CY4541, into the USB-C connector on the CY4531, and then put the video out to a monitor via the DisplayPort connector J4 on the CY4531.  Basically, I want this:


      Which is essentially a USB-C to DP dongle.  Right now I'm just using the USB-C power to power the CY4531, and not the monitor as well.  The monitor is on its own AC power. 


      I know this cannot be done on the unmodified CY4531, but I was under the impression I could make this happen with the replacement of the PS8740 with a PS8742B as well as the modification of the firmware and configuration.


      Should I be able to make this happen with what I have here (and it's just an issue with my configuration of the CCG3?), or have I misunderstood what is actually possible with these kits?  Could using a DP to DVI adapter from the CY4531 to the monitor be causing a problem?

      I notice the firmware still reports NOTEBOOK for the CY4531, is that something I need to change through device Firmware/Configuration to get this working?


      I have attached the config I am currently using.  I'm sure there's probably something wrong with it since all this USB-C is new territory for me .


      Thank You!