求达人帮我看下我的代码哪里有问题啊，我用ISE10.1不能仿真出结果~一直没找到错误，拜托帮忙看下，有点长，麻烦大家了
module passwd_lock(clk,resetb,cmd,alarmed,passed);
input clk; //输入时钟信号
input resetb; //输入复位信号
input [4:0] cmd; //输入命令信号
output alarmed; //输出警报信号
output passed; //输出通过信号
wire clk;
wire resetb;
wire [4:0] cmd;
reg alarmed;
reg passed;
parameter PASSWORD=16'b0001_0010_0011_0100;//盛放密码的参数1234
reg [15:0] password;//输入数值盛放寄存器
reg one=5'b10001,
two=5'b10010,
three=5'b10011,
four=5'b10100,
five=5'b10101,
six=5'b10110,
seven=5'b10111,
eight=5'b11000,
nine=5'b11001,
zero=5'b11000,
enter=5'b11010,
cancel=5'b11011;
reg cmd_t;//检验是否有按键按下
reg [2:0] main_state;//主状态
reg [2:0] next_state;//下一个状态
parameter waits=3'b001,
pass=3'b010,
alarm=3'b100;
reg [2:0] sub_state;
reg [2:0] next_sub_state;
parameter first=3'b000,
second=3'b001,
third=3'b010,
fourth=3'b011,
finish=3'b100;
//通过计时寄存器
reg [7:0] pass_count;
//警报计时寄存器
reg [10:0] alarm_count;
//尝试次数寄存器
reg [1:0] try_count;
//输入状态寄存器：error和correct
reg error;
reg correct;
//主机状态机部分
always@(main_state or correct or error)
begin
case(main_state)
waits:
if(correct==1) //由waits转换到pass的条件
next_state=pass;
else if(error==1&&try_count==2)
next_state=alarm; //由waits转换到alarm的条件
else
next_state=waits;
pass:
if(pass_count[7]==1)//由pass转换到waits的条件
next_state=waits;
else
next_state=pass;
alarm:
if(alarm_count[10]==1)// 由alarm转换到waits的条件
next_state=waits;
else
next_state=alarm;
default://默认状态：waits
next_state=waits;
endcase
end
//状态转换
always@(posedge clk or negedge resetb)
begin
if(!resetb)
main_state<=waits;
else
main_state<=next_state;
end
//输出控制部分
always@(posedge clk or negedge resetb)
begin
if(!resetb)//复位时，开锁输出与警报输出都为零
begin
passed<=0;
alarmed<=0;
end
else if(main_state==pass)//当主机状态为pass时，开锁
begin
passed<=1;
alarmed<=0;
end
else if(main_state==alarm)//当主机状态为alarm时，警报
begin
passed<=0;
alarmed<=1;
end
else//其它状态复位
begin
passed<=0;
alarmed<=0;
end
end
//alarm一段时间后，自动进入waits状态
//alarm定时器
always@(posedge clk or negedge resetb)
begin
if(!resetb)
alarm_count<=0;
else if(main_state==alarm)//alarm状态计时器alarm定时器加1
alarm_count<=alarm_count+1;
else
alarm_count<=0;
end
//锁pass以后计数开始，当规定的时间到达后自动上锁，并进入waits状态
//pass定时器
always@(posedge clk or negedge resetb)
begin
if(!resetb)
pass_count<=0;
else if(main_state==pass) //pass状态计时器pass定时器加1
pass_count<=pass_count+1;
else
pass_count<=0;
end
//从状态机，用于输入4位密码
always@(posedge clk or negedge resetb)
begin
if(!resetb)
cmd_t<=0;
else
cmd_t<=~cmd[4];
end
always@(posedge clk or negedge resetb)
begin
if(!resetb)
sub_state<=first;
else
sub_state<=next_sub_state;
end
always@(cmd or cmd_t or sub_state)
begin
if(cmd_t==0&&cmd[4]==1)
case(cmd)
cancel://密码输入错误时，重复上一个状态
begin
if(sub_state==first)// 第1个密码输入错误
next_sub_state=first;
else
case(sub_state)
second: // 第2个密码输入错误
next_sub_state=first;
third: // 第3个密码输入错误
next_sub_state=second;
fourth: // 第4个密码输入错? next_sub_state=third;
finish:
next_sub_state=fourth;
endcase
end
enter://4个密码输完时，进行确认
next_sub_state=first;
//以下4个命令位无效的命令，状态保持不变
5'b11100:
next_sub_state=next_sub_state;
5'b11101:
next_sub_state=next_sub_state;
5'b11110:
next_sub_state=next_sub_state;
5'b11111:
next_sub_state=next_sub_state;
//default为输入了某位密码，输入完自动将状态转入下一位
default:
case(sub_state)
first:
next_sub_state=second;
second:
next_sub_state=third;
third:
next_sub_state=fourth;
fourth:
next_sub_state=finish;
//当输入完4位密码以后状态保持不变，等待输入enter命令
finish:
next_sub_state=finish;
endcase
endcase
else
next_sub_state=sub_state;
end
//比较密码
always@(posedge clk or negedge resetb)
begin
if(!resetb)
begin
correct<=0;
error<=0;
end
else if(cmd_t ==0&&cmd==enter)
if(password==PASSWORD)//密码正确时
begin
correct<=1;
error<=0;
end
else//密码错误时
begin
error<=1;
correct<=0;
end
else
begin
correct<=0;
error<=0;
end
end
//记录密码
always@(posedge clk or negedge resetb)
begin
if(!resetb)
password<=0;
else if(cmd_t==0&&cmd[4]==1)
case(sub_state)
first:
password[15:12]<=cmd[3:0];
second:
password[11:8]<=cmd[3:0];
third:
password[7:4]<=cmd[3:0];
fourth:
password[3:0]<=cmd[3:0];
default:
password<=password;
endcase
else
password<=password;
end
//记录错误次数
always@(posedge clk or negedge resetb)
begin
if(!resetb)
try_count<=0;
else if(error==1)
try_count<=try_count+1;
else if(main_state==pass||main_state==alarm)
try_count<=0;
end
endmodule |
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