Verilog Parameter overriding -

during parameter overriding, parameter my_secret getting overridden 2.3.4.5. want impose condition overrides my_secret 2 count = 0 10, my_secret 3 count = 10 20, my_secret 4 count = 20 30, my_secret 5 count = 40 50 ?

test bench:

module tb_def_param;      // inputs     reg clk;     reg rst;     reg [4:0] a;     reg [4:0] b;    reg  [5:0] count;     parameter my_secret = 4'd0; wire [6:0] sum;      initial      begin         // initialize inputs         = 0;         b = 0;         clk = 1;         rst = 1;           // wait 100 ns global reset finish         #100 rst = 1;       #100 rst = 0;           // add stimulus here         = 5'd2;         b = 5'd3;     end  @ (posedge clk)    begin     if(rst)         count <= 6'd0;         else          count <= count + 1;     end   secret_number #(2) u0(.clk(clk), .rst(rst), .a(a),.b(b),.sum(sum)); secret_number #(3) u1(.clk(clk), .rst(rst), .a(a),.b(b),.sum(sum)); secret_number #(4) u2(.clk(clk), .rst(rst), .a(a),.b(b),.sum(sum)); secret_number #(5) u3(.clk(clk), .rst(rst), .a(a),.b(b),.sum(sum));      begin          #10 clk <= ~clk;     end   endmodule 

main module is:

 module secret_number(clk,rst,a,b,sum);   input clk, rst;  input [4:0]a,b;  output [6:0]sum;  reg [6:0] sum;  parameter my_secret = 0;  always@(posedge clk)        sum = + b + my_secret;      initial begin      $display("%d", my_secret);             end      endmodule  

is possible ???

if understand correctly, want use count determine value of my_secret used in computing sum. have of need in testbench module now, missing logic select between resulting values various secret_number modules. have of modules driving same vector sum should driving separate vectors , using combinational logic select desired result:

wire [6:0] sum2, sum3, sum4, sum5; reg [6:0] sum; secret_number #(2) u0(.clk(clk), .rst(rst), .a(a),.b(b),.sum(sum2)); secret_number #(3) u1(.clk(clk), .rst(rst), .a(a),.b(b),.sum(sum3)); secret_number #(4) u2(.clk(clk), .rst(rst), .a(a),.b(b),.sum(sum4)); secret_number #(5) u3(.clk(clk), .rst(rst), .a(a),.b(b),.sum(sum5));  @(*) begin   if (count <= 10) begin // not sure if want inclusive of 10, if not, <     sum = sum2;   end   else if (count <= 20) begin     sum = sum3;   end   else if (count <= 30) begin     sum = sum4;   end   else     sum = sum5;   end end 

however, can have my_secret input module rather parameter unless need use my_secret = 2 block when count greater 10 else. save amount of area if input instead.

(now also, inside module should sum <= + b + my_secret, use nba (<=) clocked blocks)