f4pga-examples/xc7/pulse_width_led/PWM.v

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module PWM (
input wire clk,
input wire [13:0] width,
output reg pulse
);
reg [13:0] counter = 0;
always @(posedge clk) begin
counter <= counter + 1;
if (counter < width) pulse <= 1'b1;
else pulse <= 1'b0;
end
endmodule