andyelect

ISE 8.1 进行 post-route simulation时出现如下异常，请大伙给些建议？？
Simulator is doing circuit initialization process.

Exception caused by user code. Simulation stopped when executing process: X_RAMB16.v:503 on line 7264 in file "D:/decoder_design/Active_hdl_designs/Rom_epson_controller/epson_controller/netgen/par/epson_controller_top_timesim.v"

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请大家给些建议，出现此异常的原因是什么，该如何解决这个问题，或者到哪里可能可以找到解决这个问题的途径？

谢谢！