//這個模塊實在瑣存信號的控制下，實現(xiàn)實時數(shù)據(jù)與瑣存數(shù)據(jù)的轉(zhuǎn)換；
//將用于數(shù)碼管顯示，LED燈的數(shù)據(jù)輸入端；lock用于LCD顯示控制模塊的時鐘驅(qū)動。
//lock==0;表示瑣存數(shù)據(jù)；
module pass_buffer(change,din,dout,lock);
input change,din;
output dout,lock;
//wire out0,lock;
wire lock;
reg out1;
reg pass;

assign lock=~pass;

always @(posedge change)
begin 
pass=~pass;
end

//assign out0=din&&(~pass);
always @(posedge pass)
begin
out1=din;
end
assign dout=(din&&(~pass))||(out1&&pass);

endmodule
//pass==0：實時跟蹤；lock=1;
//pass==1; 瑣存模式；lock=0;