password_lock-verilog- 数电大作业（源文件，报告） Author：Joe、Hans Fundamental function： a. Input the password. b. The green LED will light up if the password is right. c. If the user doesn't input the right password in 5 sec,the lock will be "locked"(the green LED won't light up anymore) Additional function: a. The user could change the password if he has input the right password. b. The times for which the "enter" button is pressed could be recorded and displayed on the 7-nixie tube. c. The number has been inputed,the time could also be displayed on the nixie tube. b. If you have pressed the "enter" button for 10 times without inputing the right password, the lock will also be "locked".