I have a parameterised module whose SEED value has to change depending on the WIDTH parameter, where the seed values have to be hard-coded.
module Module;
parameter WIDTH = 8;
integer seeds [31:0] = {'hC, 'h1E, 'h39, 'h7E, /* ... */};
localparam SEED = seeds[WIDTH];
endmodule
This doesn't work, It's clear I'm trying to use the unpacked array in the wrong context.
Unable to bind parameter seeds[WIDTH] in module Module
How else can I implement this?
After adjusting the post to compile with the truncated 4-element array, Questa shows:
** Error: testbench.sv(): Parameter value must be constant.
Parameters and localparams can't accept variable values.
Integer is a variable type, it can change at run time.
Parameters must be known an compile time.
This compiles without warnings:
module Module;
parameter WIDTH = 1;
parameter integer seeds[4] = {4'hC, 8'h1E, 8'h39, 8'h7E};
localparam SEED = seeds[WIDTH];
initial
$display("SEED = %0h",SEED);
endmodule
Questa Produces:
# vsim -voptargs=+acc=npr
# run -all
# SEED = 1e
This has an array of 4 hex values, and uses index 1 (WIDTH==1) as an argument to seeds.
