Page 181 - 3-2

else if(~top_idle & top_cnt_max & top_state==1) begin cf<=2'b11; end
else cf<=cf;
end
end
end

/////////////////////////////////// 버튼 리바운싱
reg one_state;
reg one_up;

reg one_sync_0;
always @(posedge clk) one_sync_0<=~one;
reg one_sync_1;
always @(posedge clk) one_sync_1<=one_sync_0;

reg [15:0] one_cnt;

wire one_idle = (one_state==one_sync_1);
wire one_cnt_max = &one_cnt;

always @(posedge clk)
if(one_idle)
one_cnt<=0;
else
begin
one_cnt<=one_cnt+16'd1;
if(one_cnt_max) one_state<=~one_state;
end

reg two_state;
reg two_up;

reg two_sync_0;
always @(posedge clk) two_sync_0<=~two;
reg two_sync_1;
always @(posedge clk) two_sync_1<=two_sync_0;

reg [15:0] two_cnt;

wire two_idle = (two_state==two_sync_1);
wire two_cnt_max = &two_cnt;

always @(posedge clk)

- 181 -