用VHDL语言实现可编程数字系统设计.该文档说明了VHDL的设计方法,设计单元,举了大量有价值的实例,给出了VHDL的代码.-VHDL language with programmable digital system design. This document describes the VHDL design method, design unit, cited an example of a large number of valuable, given the VHDL code.