v程序为module add_4(X,Y,sum,C);
input[3:0] X,Y;
output[3:0] sum;
output C;
assign {C, Sum }=X+Y;
endmodule
要使用modelsim仿真，生成的vt文件应该怎么修改？
`timescale 1 ps/ 1 ps
module add_4_vlg_tst();
// constants
// general purpose registers
// test vector input registers
reg clk;
reg [3:0] X;
reg [3:0] Y;
// wires
wire C;
wire [3:0] sum;
// assign statements (if any)
add_4 i1 (
// port map - connection between master ports and signals/registers
.C(C),
.X(X),
.Y(Y),
.sum(sum)
);
initial
begin
// code that executes only once
// insert code here --> begin
// --> end
$display("Running testbench");
end
always
// optional sensitivity list
// @(event1 or event2 or .... eventn)
begin
// code executes for every event on sensitivity list
// insert code here --> begin
// --> end
end
endmodule
`timescale 1 ps/ 1 ps
module add_4_vlg_tst();
// constants
// general purpose registers
// test vector input registers
reg clk;
reg [3:0] X;
reg [3:0] Y;
// wires
wire C;
wire [3:0] sum;
// assign statements (if any)
add_4 i1 (
// port map - connection between master ports and signals/registers
.C(C),
.X(X),
.Y(Y),
.sum(sum)
);
initial begin
X = 1;
Y = 8;
repeat(10) begin
#100
$display("X = %4b,Y = %4b",X,Y);
X = X + 1;
end
end
endmodule