Generally, a computer system is comprised of different "sub" systems so a programmer needs to have some design or top-down thinking skills to see the program from the larger picture.

总的来说，一个计算机系统是由不同的“子系统”组成的，因此程序员需要掌握一些设计技巧或者自上而下的思维方法，这样才能从整体上把握全局。

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This paper describes the top-down design method, hardware circuit buildup in detail and gives program for CPLD and single chip computer.

本文详细论述了系统自上而下的设计方法及各部分硬件电路组成及单片机、CPLD的软件编程设计。

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