Keyword: MPMC2, v1.9, OPB_toutSup
I configured an OPB PIM for my MPMC2 Core (v1.9). I found that the OPB toutSup signal was being High all the time causing my master peripheral on the OPB to be unable to access the external memory.
The issue is with the xferAck signal which was never asserted. The xferAck signal is used to reset the toutSup signal.
Use MPMC2 v1.8 with the patch in (Xilinx Answer 25146).
Add a PLB2OPB and OPB2PLB bridge to bridge to an OPB bus instead of using the OPB PIM.