原创 LED学习之跑马灯/流水灯

module LedWater(clk,rst_n,ledout);
input clk,rst_n;
output[5:0] ledout;

reg [5:0] ledout;

reg [25:0] count;

always @ (posedge clk or negedge rst_n)
begin
 if(!rst_n)
  count<=0;
 else
  count<=count+1'b1;
end

always @(posedge clk or negedge rst_n)
begin
case (count[25:22])
 0: ledout<=6'b11_1110;
 1: ledout<=6'b11_1100;
 2: ledout<=6'b11_1000;
 3: ledout<=6'b11_0000;
 4: ledout<=6'b10_0000;
 5: ledout<=6'b00_0000; 

 6: ledout<=6'b01_1111; 
 7: ledout<=6'b00_1111;
 8: ledout<=6'b00_0111;
 9: ledout<=6'b00_0011;
 10:ledout<=6'b00_0001;
 11:ledout<=6'b00_0000;
 default:ledout<=6'b10_1010; 
endcase
end
 
endmodule