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Altera_Forum's avatar
Altera_Forum
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9 years ago

How to reset a ram?

Hi, in my vhdl design I got a ram signal R then I try to test it against A with "if A > R then..." but R starts with a 'X' value so the test is not working. What could I do to solve that problem? ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

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As I'm using M9K I know the signal is starting at 0 but Modelsim doesn't know and says it's X. Is there a way of making the simulation start with 0?

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But you dont know the ram will start up at 0 (memory contents at startup will be random unless specified). Hence why you get an X in simulation - ie unknown.

You need to write something to the address to get a known value.