写了一个按键触发的流水灯，基于单稳态电路的
本帖最后由 RAMILE 于 2014-9-27 13:54 编辑这个电路的特点是每个灯的点亮时间独立可调，top模块里面，例化monostable模块时候，parameter参数控制延迟计数器的位数
//--------------------------------
module monostable
(
input clk,
input trig,
output testout2
);
parameter WIDTH = 10;
reg state_in;
reg state_ref;
reg [(WIDTH-1):0]coutn_out;
wire trig_gate;
wire trig_out;
wire carry;
assign carry = coutn_out;
assign trig_gate = testout2;
assign trig_out = trig & trig_gate;
assign testout =coutn_out[(WIDTH-1):0];
assign testout2 = ( state_ref == state_in);
always @(posedge trig)
if(testout2)
state_in = ~state_in;
else
state_in =state_in;
always @(posedge clk)begin
if(state_in != state_ref)
coutn_out= coutn_out + 1'b1;
else
coutn_out = 0;
end
always @(posedge carry )
state_ref <= ~state_ref;
endmodule
//-----------------------------------
module div_count(
input clk,
output clk_div
);
parameter DIV_REG_WIDTH = 16;
reg [(DIV_REG_WIDTH-1):0] count;
assign clk_div = count;
always@(posedge clk)
count <= count + 1;
endmodule
//================
module top(
input clk,
input trig,
output out1,
output out2,
output out3,
output out4
);
wire in1,in2,in3,in4;
assign in2 = out1;
assign in3 = out2;
assign in4 = out3;
div_count div_count_i(.clk(clk), .clk_div(clk_solw));
monostable #(12)monostable_i1(.clk(clk_solw), .trig(trig), .testout2(out1));
monostable #(13)monostable_i2(.clk(clk_solw), .trig(in2), .testout2(out2));
monostable #(11)monostable_i3(.clk(clk_solw), .trig(in3), .testout2(out3));
monostable #(11)monostable_i4(.clk(clk_solw), .trig(in4), .testout2(out4));
endmodule 谢谢分享!
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