说明：  用状态机实现一个逻辑运算单元,该逻辑运算单元拥有常规的计算功能.状态机保证层次清晰,用门级电路搭建而成,可以直接综合并且流片.
(State machine with the realization of a logic operation unit, the logic operation unit has a conventional computing. State machine to ensure that the level of clarity, with gate-level circuit structure which can be directly integrated and tape.)