fifo megafunction simulation problem

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hi there,

i'm new in fpga world and i just started playing with megafunctions, and already encountered problems.

i'm trying to adapt a working structure on xilinx to altera(the project isn't mine, i just have to adapt it to altera, so i can learn more about this job).

i'm using a module with different clocks for read and write, asynchronous reset, and only the rdempty signal. when i simulate the entire module, after inserting some data's, i try to read them, but the "q" signal is zzzzz :(

i also noticed that the rdempty signal is in a hi-z state.

i replaced the megafunction fifo with a manual made module, having the same properties(different clocks, rdempty signal) and it works properly.

Any ideas? please

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Did you fix your problem? I have similar problems since my q is also Z. Just to note, Altera-ModelSim only supports Altera's Megafuctions, if you are using any Xilinx IP on it, it will fail.