/************最简单状态机, 三角波发生器**************/
/**************************************************/
/**************************************************/
/******************20250614************************/
`timescale 1ns/10ps
module tri_gen
(
clk,
res,
d_out
);
input clk;
input res;
output[8:0] d_out;
reg[2:0] state; //主状态机寄存器;
reg[8:0] d_out;
reg[7:0] con; //计数器, 记录平顶时间
always@(posedge clk or negedge res)
if(~res)
begin
state <=0;
d_out <=0;
con <=0;
end
else
begin
case(state)
/**************************************************/
0: //上升
begin
d_out <=d_out +1;
if(d_out ==299)
begin
state <=1;
end
end
/**************************************************/
1: //平顶
begin
if(con ==200)
begin
state <=2;
con <=0;
end
else
begin
con <=con +1;
end
end
/**************************************************/
2: //下降
begin
d_out <=d_out -1;
if(d_out ==1)
begin
state <=3;
end
end
/**************************************************/
3: //平底
begin
if(con ==200)
begin
state <=0;
con <=0;
end
else
begin
con <=con +1;
end
end
/**************************************************/
endcase
end
endmodule
/****************testbench oftri_gen***************/
module tri_gen_tb;
reg clk, res;
wire[8:0] d_out;
tri_gen tri_gen
(
.clk(clk),
.res(res),
.d_out(d_out)
);
initial
begin
clk <=0;
res <=0;
#17 res <=1;
#20000 $stop;
end
always #5 clk <= ~clk;
endmodule
/**************************************************/
/**************************************************/
/**************************************************/
| 
楼主
标题置顶
标题高亮
