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Altera_Forum's avatar
Altera_Forum
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8 years ago

Is it possible to use $writememb in Quartus II?

Hi all.

I have a question about $writememb command in Verilog coding.

I can run $readmemb command without problem, but I can't get any output from $writememb command.

I have my code compilation passed without error, but the target file doesn't get anything written in it after run.

There are very few references on google and I am rather confused whether $writememb is a valid command in Quartus II.

If it is, can anyone share the experience on how to use the command correctly?

Thanks.

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    8 years ago

    $readmemb() works in a verilog initial block to set the initial contents of a block ram. This is valid in QuartusII to fill a register array (eg, block rams) with data at FPGA configuration time. It will work either in QuartusII (implementation) or modelsim (simulation).

    However, $writememb() makes no sense in an FPGA implementation itself. Write the memory contents where? $writememb() would only be valid and useful in a test bench, not the FPGA itself. It does work in modelsim (simulation) as in a test bench context.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    8 years ago

    I see! Thank you ak6dn!

    Now I see what has gone wrong in my concept.

    Thank you very much for the explanation. :)