数字密码锁的使用体现了人们消费水平、保安意识和科技水平的提高，而且避免了携带甚至丢失钥匙的麻烦。
The use of digital password lock incarnates the improvements of people's consumption levels, security awareness and scientific levels, and avoid carrying even lost keys trouble.
而用VHDL可以更加快速、灵活地设计出符合各种要求的数字密码锁优于其他设计方法使设计过程达到高度自动化。
However, using VHDL could design the digital password locks which consistent with all kinds of requirements and more rapid and flexible than other methods, to achieve highly automated design process.
文中以数字密码锁的设计为实例，从方案的确定，各阶层的划分，VHDL的应用，介绍了VHDL自顶向下的设计方法。
This paper introduces the VHDL top down design method including scheme determination, hierarchy division, and VHDL application taking a digital code lock design for example.
密码锁的功能具备，6位数字密码输入正确开锁，修改密码，后门查看当前密码，三次输入错误报警，密码保存。
Have the function of locks, 6-digit password to enter the correct lock, modify passwords, backdoor view the current password, enter the error report to the police three times, the password saved.
密码锁的功能具备，6位数字密码输入正确开锁，修改密码，后门查看当前密码，三次输入错误报警，密码保存。
Have the function of locks, 6-digit password to enter the correct lock, modify passwords, backdoor view the current password, enter the error report to the police three times, the password saved.
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