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Altera_Forum
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17 years ago

Dual port RAM in Quartus II 7.2, different behavior on ModelSim than Quartus simulato

I'm using the Quartus II template for a true Dual port RAM with single clock, when I simulate it in Quartus simulator the behavior is ok, and synthsised correctly to the memory bits in a Cyclone III ...
Altera_Forum's avatar
Altera_Forum
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17 years ago

I am not sure but most likely the Quartus sim will infer a RAM and use it's ALTSYNCRAM RAM models. (As if you had used a megafunction)

Modelsim will not use the same models. It would do if you used a megafunction and included the appropriate altera libraries.

That would explain the difference. Why modelsim gives an error I am not sure. (Without looking at your code in detail).

Is there any reason why you haven't used a mega-function? At least modelsim would match Quartus then