33. Data Types

Question.5

During elaboration of the top module, what happens in regards to the parameter overrides instantiated in u1?

module timer #(
    parameter BASE = 8'h10
) (/* ports */);
    localparam OFFSET = 8'h05;
    // logic...
endmodule

module top;
    timer #(.BASE(8'h20), .OFFSET(8'h0A)) u1();
endmodule

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Both BASE and OFFSET are successfully overridden to the new values 8'h20 and 8'h0A
Only BASE is overridden; attempting to explicitly override OFFSET causes a compilation error because localparam is strictly immutable from outside the module
The module compiles successfully, but OFFSET silently ignores the override, remaining functionally 8'h05
A syntax error occurs because overriding parameters by name is only valid for integers

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