🚀 go-pugleaf

In article <ovs5imk@fido.asd.sgi.com>, williams@agomoda.asd.sgi.com (Eric Williams) writes:
|> In <4006@rbiffm.informatik.uni-frankfurt.de> justin@rbiffm.informatik.uni-frankfurt.de (Justin Strohschneider) writes:
|> 
|> >For the simulation of a computer architecture it is necessary for me to
|> >define a RAM as a module and to have several incarnations of this RAM with
|> >different contents.
|> >The $readmem system task can be used to fill a memory array with data.
|> >The problem I have is to realize different filenames in the $readmem task.
|> >I would be very glad if anybody could give me some information concerning
|> >this problem.
|> 
|> Two ways you could do this.  The first method simply does the readmemh from
|> the module that instantiates the memories.  It sounds like you're trying to
|> put the readmem in the module that contains the memory.  In this case try
|> method 2 which passes this filename into the module as an input.
|> 
|> -Eric Williams


Another alternative (and prefered over second option shown by Eric is
to use the parameter construct. There are two ways to use this:
override with defparam and module parameter value assignment.
Both are shown in the following simple example. Note I only use
a $display but it could be $readmemh or whatever.


module test;

wire A;

memmod #("FILEA") U1(A); // Parameter Value Assignment

defparam U2.FOO = "BAR";
memmod U2(A);

endmodule

module memmod(A);
input A;

parameter FOO = "";

initial
 $display("%s",FOO);
endmodule


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