Is it possible to perform PMA level loop back through PCIe endpoints pipe interface? 7 Series integrated pcie IP block provides an option to control transceivers through "Additional control and status port". One of the control port is "pipe_loopback[2:0]". Can I set this port to "010" to achieve PMA level loopback in the transceiver?
Transceiver user guide says the following for Near-End PMA loopback:
• Near-End PMA Loopback (path 2 in Figure 2-26) A GTRXRESET is required after entering and exiting near-end PMA loopback.
How do I assert GTRXRESET to the transceivers from PCIe wrapper. There is no such port that PCIe brings out.