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TimerCountDown.v
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TimerCountDown.v
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module TimerCountDown(clk, rst, enable, ms100, timeOut, stop);
input clk, rst, enable, ms100;
output reg [6:0] timeOut;
output reg stop;
reg[4:0] count;
parameter timeInSec=30; //time for game to run.
parameter Wait=0, Start=1, Stop=2;
reg[1:0] state;
always@(posedge clk)begin
if(rst==0)begin
count<=0;
state<=Wait;
stop<=0;
timeOut<=timeInSec;
end
else begin
case(state)
Wait: begin//waits for enable high
if(enable==1) begin
state<=Start;
timeOut<=timeInSec;
end
end
Start: begin
if(ms100==1)begin
count=count+1;
if(count==10)begin
timeOut<=timeOut-1;
count=0;
end
if(timeOut==0)begin
state<=Stop;
stop<=1;
end
end
end
Stop: begin
stop<=0;
if(enable==1) begin
count<=0;
timeOut<=timeInSec;
state<=Start;
stop<=0;
end
end
default: begin
count<=0;
state<=Wait;
stop<=0;
timeOut<=timeInSec;
end
endcase
end
end
endmodule