串口，并口都有，只写了横线，竖线按需要修改就好，绝对可以用-Serial, parallel and have only to write a horizontal line, vertical line need to be modified like can definitely use

三种设计模式的加法器，分别是行为及描述，串行模式，并行模式。希望对大家了解加法器有帮助-Adder three design models, and behavior were described, the serial mode, the parallel mode. I hope to help everyone understand adder