Having trouble simulating the dcfifo Megafunction

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I can't however seem to find a similar package to include for system verilog. Do you have any insight into this?

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You would need to pass a library argument to vsim, eg., vsim -L altera_mf, or perhaps altera_mf_ver if that is what it is called.

The machine I am typing on now has Quartus 12.1sp1 Web edition, and in its Modelsim-ASE folder is ...

C:\software\altera\12.1sp1_free\modelsim_ase\altera\verilog\altera_mf

so I think vsim <testbench> -L altera_mf is probably what you want.

Cheers,

Dave