设计一个两位全加器，并用发光二极管显示结果。全加器的三个输入（二个数字输入，一个进位输入）用实验箱中W1,SW2,SW3控制，二个输出用发光管LED1,LED2显示。整个设计采用层次设计方法，顶层文件采用原理图输入法。整个电路设计思路分三部分：

1半加器电路设计；

2.全加器电路设计，是在半加器的基础上设计的；

3.数据输入，输出电路设计。

-The design of a two full-adder, and the result will be displayed using light-emitting diodes. Full adder of the three inputs (two digital input, a binary input) with the experimental box W1, SW2, SW3 control, two output with LED LED1, LED2 display. Used throughout the design-level design methodology, the top-level schematic document using the input method. The whole circuit design divided into three parts: one half adder circuit design　2. Full adder circuit design, in the half adder based on the design　3. Data input and output circuit design.