When I use the MPMC VFBC interface with Spartan-6 FPGA, VFBC cannot be set as read-only or write only. The Advanced -> Data Path Configuration tab of the MPMC GUI is greyed-out.
How do I change these settings?
This issue is fixed starting with MPMC v5.04.a, released in EDK 11.4.
Note that while the VFBC can be configured as bidirectional, read-only, or write-only, the VFBC will still consume a bidirectional MCB port in Spartan-6 FPGA.