编写一个密码锁的程序，自己编写了一个，在ISE软件里运行正确，可是在实验板上无法显示.综合，四位按键输入，初始密码是123，3次输入错误后就报警，有退格，确认按键，请教一下，程序如下：
module lock(rst,clk,cmd,cancel,enter,pass,alarm);
input clk;
input rst;
input [3:0]cmd;
input cancel,enter;
output pass;
output alarm;
reg pass,alarm;
reg [2:0]d;
reg [8:0]password;
reg [2:0]count;
reg [2:0]state;
parameter PASSWORD='d123;
parameter st0=0,st1=1,st2=2,st3=3,st4=4;
always @(cmd)
begin
case(cmd)
4'b0111:d<=1;
4'b1011:d<=2;
4'b1101:d<=3;
4'b1110:d<=4;
default:d<=0;
endcase
end
always @(posedge clk)
if(!rst)
begin
pass<=0;
alarm<=0;
password<=0;
count<=0;
end
else
case(state)
st0:begin
pass<=0;
alarm<=0;
password[8:6]<=d;
state<=st1;
end
st1:if(!cancel)
begin
password<=0;
state<=st0;
end
else
begin
password[5:3]<=d;
pass<=0;
alarm<=0;
state<=st2;
end
st2:if(!cancel)
begin
state<=st1;
end
else
begin
password[2:0]<=d;
pass<=0;
alarm<=0;
state<=st3;
end
st3:if(!cancel)
state<=st2;
else
begin
password[2:0]<=d;
pass<=0;
alarm<=0;
state<=st4;
end
st4:if(!enter)
if(password==PASSWORD)
begin
pass<=1;
alarm<=0;
state<=st0;
end
else
count<=count+1;
else if(count>2)
begin
pass<=0;
alarm<=1;
state<=st0;
end
default:begin
pass<=0;
alarm<=0;
state<=st0;
end
endcase
endmodule |
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