Initial CommitHEADmaster

1 files changed, 20 insertions, 0 deletions

diff --git a/button_sync.v b/button_sync.v
new file mode 100644
index 0000000..5913ce5
--- /dev/null
+++ b/button_sync.v
@@ -0,0 +1,20 @@
+// 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