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// From the book
module led_toggle (
input clk_i,
input key_i,
output [5:0] led
);
reg r_LED_1 = 1'b1;
reg r_Switch_1 = 1'b1;
always @(posedge clk_i) begin
r_Switch_1 <= key_i;
if (key_i == 1'b1 && r_Switch_1 == 1'b0) begin
r_LED_1 <= ~r_LED_1;
end
end
assign led[0] = r_LED_1;
assign led[5:1] = 4'b1111;
endmodule
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