可编程逻辑器件的应用

Application of Programmable Logic Device

从 3个方面讨论了可编程器件的应用 .首先 ,使用了一个串入并出移位寄存器“74 16 4”宏单元 ,将一路数据流分成两路 .这种方法实际用了MAX +PLUSII软件提供的移位寄存器宏单元 ,使用起来简单、方便 .第 2种设计方法的特点是针对FLEX系列器件结构在查找表结构的基础上 ,对工作速度和占芯片面积进行优化 .第 3种方法是用VHDL语言编制一个 4位二进制同步计数器 ,用语言描述的特点是描述能力强 ,覆盖面广 ,抽象能力强 .

This paper an attempt to fulfilled methods of application in programmable logic device in three aspects.The first method is that a series connection-input and parallel connection-output macrocell of register “74164” is adopted,which divides one part of data stream into two parts.Actually this kind of method uses macrocell of shift register offered by MAX+PLUS II software ,it is simple and convenient.The characters of second method is that on the basis of looking for form structure,pointing to FLEX series device structure,work speed and chip area are optimized.The third one is programming a 4-bit binary system synchronization counter.The characters of VHDL language is expressive,wide-coverage and highly abstract.