keyscan_tb

`timescale 1ns/1ps

module Rom_tb;

reg clk;

reg rst_n;

reg [4:0] num;

reg [3:0] row;

wire [3:0] col;

wire [7:0] q;

initial begin

clk <= 1'b1;

rst_n <= 1'b0;

#20 rst_n <= 1'b1;

#100 num <= 5'h1;

#500 num <= 5'h1F;

#10000 num <= 5'h2;

#500 num <= 5'h1F;

#10000 num <= 5'h3;

#500 num <= 5'h1F;

#10000 num <= 5'h4;

#500 num <= 5'h1F;

end

always #5 clk = !clk;

Rom RomInst(

.clk (clk),

.rst_n (rst_n),

.row (row),

.col (col),

.q (q)

);

always @ (*)

begin

case (num)

5'h0: row <= {1'b1, 1'b1, 1'b1, col[0]};

5'h1: row <= {1'b1, 1'b1, 1'b1, col[1]};

5'h2: row <= {1'b1, 1'b1, 1'b1, col[2]};

5'h3: row <= {1'b1, 1'b1, 1'b1, col[3]};

5'h4: row <= {1'b1, 1'b1, col[0], 1'b1};

5'h5: row <= {1'b1, 1'b1, col[1], 1'b1};

5'h6: row <= {1'b1, 1'b1, col[2], 1'b1};

5'h7: row <= {1'b1, 1'b1, col[3], 1'b1};

5'h8: row <= {1'b1, col[0], 1'b1, 1'b1};

5'h9: row <= {1'b1, col[1], 1'b1, 1'b1};

5'hA: row <= {1'b1, col[2], 1'b1, 1'b1};

5'hB: row <= {1'b1, col[3], 1'b1, 1'b1};

5'hC: row <= {col[0], 1'b1, 1'b1, 1'b1};

5'hD: row <= {col[1], 1'b1, 1'b1, 1'b1};

5'hE: row <= {col[2], 1'b1, 1'b1, 1'b1};

5'hF: row <= {col[2], 1'b1, 1'b1, 1'b1};

default: row <= {1'b1, 1'b1, 1'b1, 1'b1};

endcase

end

defparam RomInst.KeyScanInst.T10ms = 5;

endmodule

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