spare circuit

In the design of hardware platform, this paper expounds design process and principle of system power, decoding circuit, memory unit, audio interface unit, peripheral communication interface unit, display unit, keyboard input unit, simulation unit and spare interface unit.

在硬件平台的设计中，具体阐述了系统电源、系统译码电路、存储器单元、音频接口单元、外围通信接口单元、显示单元、键盘输入单元、仿真单元和备用接口单元的设计过程及其原理。

BE that the electric circuit structure is simple first, need a handful of spare parts can get the appropriation chip then can carry out of the electric voltage output function and have very high sex price a ratio.

首先是电路结构简单，只需要少数的分离元器件就可以得到专用芯片才能实现的电压输出功能，具有很高的性价比。