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How do I prevent selected parameters of a module from being overridden during instantiation?
If a specific parameter within a module must be prevented from being overridden, then it must be declared using the localparam construct, rather than parameter construct. Localparam construct has been introduced from Verilog-2001. Note that a localparam variable is fully identical to being defined as a parameter, too. In the below example, localparam construct is used to specify num_bits, and thus trying to override it directly gives an error message.
Consider that, though, that, since width and depth are specified using the parameter construct, they can be overridden at the time of instantiation or using defparam, and thus will indirectly override the num_bits values. Usually, localparam constructs are useful in defining new and localized identifiers whose values are derived from regular parameters.
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