I've learned that using a parameter in defining a module is a good habit like having a default value for the parameter in C++ or other languages.
So, I've used a parameter value a lot but faced a problem when I want to compare some register variable to a constant value that has an equal size with the parameter.
For example, I declare a variable size of which is the value of the parameter and would like to compare it with a constant value sized 8bits such as 8'b0.
module top_module #(parameter SIZE = 8) (output out_top); reg [(SIZE-1):0] temp_var; assign out_top = (temp_var == 8'b0) ? 1'b0 : 1'b1; endmodule
If I use the constant value with the specific size, in this case, 8'b, it would be problematic when I want to instantiate the module with the #SIZE = 16 like below.
top_module #(SIZE=16) top_module_inst;
Is there any way to use the parameter in a declaration of the parameter?
Or should I change the size of the constant value when I instantiate the module with different size every time?
Can anyone please explain the differences between using Hardcoded values and parameters during Synthesis and Simulation?