2011/11/14 8位元加法器

程式碼 -----------8bits------------

module top;
reg [7:0] A, B;
reg Cin;
wire[7:0] Sum;
adder8 M2(Cout, Sum, A, B, Cin);
initial
begin
A=8'd64;
B=8'd64;
Cin=1'd0;
#100;
end
endmodule
module adder1(Cout, Sum, A, B, Cin);
output Cout,Sum;
input A,B,Cin;
and I1 (AandB, A, B);
xor I2 (AxorB, A, B);
and I3 (And1, AxorB, Cin);
or  I4 (Cout, AandB, And1);
xor I5 (Sum, AxorB, Cin);
endmodule
module adder8(Cout, Sum, A, B, Cin);
output Cout;
output [7:0] Sum;
input [7:0] A, B;
input Cin;
adder4 I1 (C0, Sum[7:4], A[7:4], B[7:4], Cin);
adder4 I2 (Cout, Sum[3:0], A[3:0], B[3:0], C0);
endmodule
module adder4(Cout, Sum, A, B, Cin);
output Cout;
output [3:0] Sum;
input [3:0] A, B;
input Cin;
adder2 I1 (C0, Sum[3:2], A[3:2], B[3:2], Cin);
adder2 I2 (Cout, Sum[1:0], A[1:0], B[1:0], C0);
endmodule
module adder2(Cout, Sum, A, B, Cin);


時脈圖

p.s. 位元較高的程式碼，要擺在位元較低的程式碼上方。

2011/10/24 多工

module top;
reg [1:0] A, B;
wire[1:0] OUT;
system_clock #100 clock1(SEL);
mux2 M1(OUT, A, B, SEL);
initial
begin
A=2'd2;
B=2'd1;
end
endmodule

module mux(OUT, A, B, SEL);
output OUT;
input A,B,SEL;
not I5 (sel_n, SEL);
and I6 (sel_a, A, SEL);
and I7 (sel_b, sel_n, B);
or I4 (OUT, sel_a, sel_b);
endmodule

module mux2(OUT, A, B, SEL);
output [1:0] OUT;
input [1:0] A,B;
input SEL;
mux hi (OUT[1], A[1], B[1], SEL);
mux lo (OUT[0], A[0], B[0], SEL);
endmodule
module system_clock(clk);
parameter PERIOD=100;
output clk;
reg clk;
initial
clk=0;
always
begin
#(PERIOD/2)clk=~clk;
end
always@(posedge clk)
if($time>1000)
$stop;
endmodule
-----------

4bits 多工

module top;
system_clock #100 clock1(A);
system_clock #200 clock2(B);
system_clock #400 clock3(SEL);
mux ml(OUT,A,B,SEL);
mux2 ml(OUT,A,B,SEL);
mux4 ml(OUT,A,B,SEL);
endmodule

module mux(OUT, A, B, SEL);
output OUT;
input A,B,SEL;
not I5 (sel_n, SEL);
and I6 (sel_a, A, SEL);
and I7 (sel_b, sel_n, B);
or I4 (OUT, sel_a, sel_b);
endmodule

module mux2(OUT, A, B, SEL);
output [1:0] OUT;
input [1:0] A,B;
input SEL;
mux hi (OUT[1], A[1], B[1], SEL);
mux lo (OUT[0], A[0], B[0], SEL);
endmodule
module mux4(OUT, A, B, SEL);
output [3:0] OUT;
input [3:0] A,B;
input SEL;
mux2 hi (OUT[3:2], A[3:2], B[3:2], SEL);
mux2 lo (OUT[1:0], A[1:0], B[1:0], SEL);
endmodule
module system_clock(clk);
parameter PERIOD=100;
output clk;
reg clk;
initial
clk=0;
always
begin
#(PERIOD/2)clk=~clk;
end
always@(posedge clk)
if($time>1000)
$stop;
endmodule

2011/10/17 Test 印出

依上星期範例
修改測試

程式碼

module top;
system_clock #400 clock1(A);
system_clock #200 clock2(B);
system_clock #100 clock3(SEL);
mux Ml(OUT,A,B,SEL);
endmodule
module mux(OUT, A, B, SEL);
output OUT;
input A,B,SEL;
not I5 (sel_n, SEL);
and I6 (sel_a, A, SEL);
and I7 (sel_b, sel_n, B);
or I4 (OUT, sel_a, sel_b);
endmodule
module system_clock(clk);
parameter PERIOD=100;
output clk;
reg clk;
initial
clk=0;
always
begin
#(PERIOD/2)clk=~clk;
end
always@(posedge clk)
if($time>1000)
$stop;
endmodule

時邁圖

 ------------------------------------------------------------

"hello verilog"

原版

module hello1;
initial $display("Hello Verilog");
endmodule

 印出

如果改成這樣

module hello2; initial $display("Hello Verilog");endmodule

或是這樣

module
hello3;
initial
$display(
"Hello Verilog"
                           )
                          ;
endmodule

結果依然相同
但是 "Hello Verilog" 的 "" 不可和 Hello Verilog 分離
否則會出錯    ↓

2011/10/03 課堂範例測試

範例：

程式碼：

module top;
system_clock #100 clock1(A);
system_clock #200 clock2(B);
system_clock #400 clock3(SEL);
mux ml(OUT,A,B,SEL);
endmodule
module mux(OUT, A,B,SEL);
output OUT;
input A,B,SEL;
not I5 (sel_n, SEL);
and I6 (sel_a, A, SEL);
and I7 (sel_b, sel_n, B);
or I4 (OUT, sel_a, sel_b);
endmodule
module system_clock(clk);
parameter PERIOD=100;
output clk;
reg clk;
initial
clk=0;
always
begin
#(PERIOD/2)clk=~clk;
end
always@(posedge clk)
if($time>1000)
$stop;
endmodule

時脈圖：