SPRUIL1D May 2019 – December 2024 DRA829J , DRA829J-Q1 , DRA829V , DRA829V-Q1 , TDA4VM , TDA4VM-Q1
The loopback path when PCIe subsystem is loopback slave is:
Remote device -> PCIe Link -> PIPE (RX) -> Loopback -> PIPE (TX) -> PCIe Link -> Remote device
If the PCIe subsystem is a loopback slave, then the incoming serial data is routed back to the originating device from the PIPE interface as per PCIe loopback requirements. Typically, PCIe test equipment will be used as loopback master and it will transition PCIe subsystem into loopback slave state following which the inbound transactions will be loopback to the test equipment. There is no programming required on PCIe subsystem to enter loopback in slave mode. PHY support is not required to use this loopback mode.