SHOW:
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| 1 | `timescale 1ns / 1ps | |
| 2 | ||
| 3 | module clock(input clk, input reset, output clk_out); | |
| 4 | ||
| 5 | reg [14:0] ctr; | |
| 6 | assign clk_out = ctr[13]; | |
| 7 | ||
| 8 | always @(posedge clk) begin | |
| 9 | ||
| 10 | if (reset == 1) ctr = 0; | |
| 11 | else ctr = ctr + 1; | |
| 12 | ||
| 13 | end | |
| 14 | ||
| 15 | endmodule | |
| 16 | ||
| 17 | module dancingLED(input clk, input reset_clk, input reset_led, output reg [3:0] EN, output reg [7:0] y | |
| 18 | ); | |
| 19 | ||
| 20 | wire clk_out; | |
| 21 | clock cout(clk,reset_clk,clk_out); | |
| 22 | ||
| 23 | ||
| 24 | always@(posedge clk_out) begin | |
| 25 | ||
| 26 | ||
| 27 | ||
| 28 | if (reset_led == 1'b1) begin | |
| 29 | EN = 4'b1110; | |
| 30 | y = 8'b11111110; | |
| 31 | end | |
| 32 | ||
| 33 | else begin | |
| 34 | - | if (y[7] == 0) EN = (EN << 1) | (EN >> 3); |
| 34 | + | if (y[7] == 0) {EN[3:1],EN[0]} = {EN[2:0],EN[3]};
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| 35 | - | y = (y << 1) | (y >> 7); |
| 35 | + | {y[7:1],y[0]} = {y[6:0], y[7]};
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| 36 | end | |
| 37 | ||
| 38 | end | |
| 39 | ||
| 40 | endmodule | |
| 41 | ||
| 42 |