verilog: how do I add parameters

Question

I want to have parameterized module. It has the following definition:

module example (...);
    parameter A = 2;
    parameter B = 2;
    parameter C = A + B;

endmodule

However, when I print out the parameter values, I get A = 2, B = 2, and C = 1... Any ideas why?

Jin · Accepted Answer · 2013-02-27 20:49:04Z

6

Found a solution - use localparam.

module example (...);
  parameter A = 2;
  parameter B = 2;
  localparam C = A + B;

endmodule

answered Feb 27, 2013 at 20:49

Jin

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2 Comments

jclin Over a year ago

In fact in your original question, C should be equal to 4. However, it is dangerous and very possible to be overrided because C is a parameter. Using localparam is the right way to define a parameter which cannot be override by defparam or instance parameter value assignments.

Morgan Over a year ago

Except localparams can not be used for port lists, using verilog-2001 style port declarations.

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