We had initially intended on implementing Display Port interfaces in our design (two source interfaces and one sink). We decided against Display Port but we are trying to use this same physical interface (Altera high speed SerDes, SN75DP130 redriver, DP connector, DP cable) on the board for a serial link of our own design. However, we don’t seem to be able to get it to work. And by work, I mean getting output from the source side SN75DP130.
The first question, is there anything specific about the cable redriver part that makes it only work with Display port transport protocols, or is it usable for other transports as long as the physical interface is the same (transport agnostic)? I am assuming it is transport agnostic as I don't believe it has any visibility into any higher transport layers.
What we have done so far is that we have Reset and EN high, HPD is high through the link from sink to source. And we have gone in and written the registers to disable link training, turn on 4 lanes (DPCD addr 00101h LANE_COUNT_SET) and set to “normal power” following an example script in the EVB manual. However, we don’t appear to be getting any output. Is there something we may be missing? We are not doing anything with the AUX channel in our implementation (it connected as per device docs, just not used).
