本文采用VHDL语言和图形输入方式相结合的方法，在CPLD芯片上实现了电子车速里程表。该器件具有体积小、可靠性高、可升级和重复再利用等特点。
In the way of combining VHDL with graph, an inputted electronic speedometer in CPLD is designed. This device is small in size, stable in function, and can be upgraded and reused.
如果有可再利用的替代品，不要继续使用一次性材料的东西。
Don't continue to use disposable materials when there are reusable substitutes.
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