Problem in simulating Xilinx MPMC in VCSMX

Hi,
I have been trying to simulate Xilinx's MPMC (mpmc_v4_02_a, a DDR
memory controller) in VCSMX. But it is not working. i.e., the
MPMC_InitDone is at value '0' for some time then goes to 'z'
indefinitely.

But the same MPMC is working OK in Modelsim,.

How to do the MPMC simulation work in VCSMX? Has anyone tried it
before, successfully?

Best regards,
Muthu