How to make a generic NxM signed array multiplier using verilog?

Question

I did a 8 bit by 8 bit before,but it was not generic. i cant figure out how to adjust the code to make it NxM bit . can anyone help me?

You'll increase your chances of getting an answer if you add some code and show what you tried to make it generic. — ByteWelder, Apr 01 '16 at 15:25

score 2 · Answer 1 · edited Apr 14 '16 at 15:16

You need to use parameters. Parameters are basically input constants and are a good way of writing generic code. They sit between the name of the module and the ports in a list that looks like the port list, but is preceded by a hash:

module <MODULE NAME> #(<SOME TYPE> <PARAMETER NAME>=<DEFAULT_VALUE>, ...) (<THE PORTS>);

The ports themselves can be declared using the parameters. It is common to use a parameter to, for example, define the widths of inputs and outputs.

Here is an example (using an MxN multiplier):

module MULT #(integer M=8, integer N=8) (input [M-1:0] A, [N-1:0] B, [(M+N)-1:0] F);

  assign F = A * B;

endmodule

http://www.edaplayground.com/x/2Bvx

So, it's very easy if you're happy to just synthesize your multiplier. If your multiplier design is more structural, then you're going to have to learn about generate loops.

How to make a generic NxM signed array multiplier using verilog?

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