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// This module is used for sycronizing the keys to the clock.
// The key input is active low, like the keys on the board.
// This module inverts the buttons so that the pressed output is active high
// button_down is high if any of the buttons are pressed
module button_sync (
input clk,
input [7:0] key,
output button_down,
output reg [7:0] pressed
);
// used to avoid metastability
reg [7:0] key1;
assign button_down = |pressed;
always @(posedge clk) begin
pressed <= key1;
key1 <= key;
end
endmodule
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