nextpnr/machxo2/examples/blinky.v

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module top(input clk, rst, output reg [7:0] leds);
reg [7:0] ctr;
always @(posedge clk)
if (rst)
ctr <= 8'h00;
else
ctr <= ctr + 1'b1;
assign leds = ctr;
endmodule