| /* Binary counter displayed on LEDs (the 4 green ones on the right). | |
| * Changes value about once a second. | |
| */ | |
| module top ( | |
| input clk, | |
| output LED2, | |
| output LED3, | |
| output LED4, | |
| output LED5 | |
| ); | |
| localparam BITS = 4; | |
| localparam LOG2DELAY = 22; | |
| reg [BITS+LOG2DELAY-1:0] counter = 0; | |
| reg [BITS-1:0] outcnt; | |
| always @(posedge clk) begin | |
| counter <= counter + 1; | |
| outcnt <= counter >> LOG2DELAY; | |
| end | |
| assign {LED2, LED3, LED4, LED5} = outcnt; | |
| endmodule |