SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The Section 26.9.7.5.1 lists the implementation-specific (that is, not PCIe-standard) “port logic” - PL registers, mapped in the 4-KiB PCIe configuration space along with the PCIe-standard registers already described. Unlike the standard registers, port logic (PL) registers are not affected by the device type (Type-0/EP vs. Type-1/RC).
Besides at the (DIF CS space) physical addresses listed in below tables, the PCIe PL configuration registers are also locally accessible (aliased) at the (DIF CS2 space) base address 0x5100_1700 (PCIe_SS1) and 0x5180_1700 (PCIe_SS2), without any difference in PL registers behaviour between CS and CS2 spaces. There is also no difference in PL registers behaviour between PCIe wire remote accesses and local (DIF CS,CS2) accesses.