基于可编程计数器的时序逻辑电路设计-渤海大学.PDFVIP

《》2010 11 322 　 基于可编程计数器的时序逻辑电路设计 任骏原 ( , 　12 1000) 　:介绍了基于 MSI 可编程计数器74LS16 1的时序逻辑电路设计技术, 目的是探索 MSI 可编程计数器实现 一 时 序逻辑电路的扩展应用方法, 即以计数器 Q , Q , Q , Q 端的代码组合表示时序逻辑电路的各 个状态, 由输入变量控制计数 3 2 1 0 器的EP, ET 及LD端, 综合利用计数、置数、保持功能, 使计数器的状态变化满足所要求的时序, 用计数功能实现“次态=现态 +1”的二进制时序关系, 用置数功能实现“次态=预置数”的非二进制时序关系, 用保持功能实现“次态=现态”的自循环时 序关系。所述方法的创新点是提出了MSI 可编程计数器改变应用方向的逻辑修改方法。 :可编程计数器;二进制时序;非二进制时序;逻辑设计 :T N79　　　　　:A 　　　　　:1004-373X(2010)11-0167-04 Design of Sequential Logic Circuits Based on Programmable Counter REN Jun-yuan (Department f Phy sics, B hai University, Jinzh u 12 1000, China) Abstract:The design technique f the sequential l gic circuits based n MSI pr grammable c unter 74LS16 1 is presented. The purp se is t investegate a c mm n meth d t realize the sequential l gic circuits.In the design, the c de c mbinati n f Q , Q , Q and Q is taken t den te the states f the sequential l gic circuit, the input variables are ad pted t c ntr l the 3 2 1 0 EP, ET and p rts f LD, and the data-set ting, c unting and keeping functi ns are used t all w the change f the c unter state t meet the requirement f the sequence, which means that the c unting functi n is used t realize the binary sequential relati n (″next state=present state+1″), the data-setting functi n is used t achieve the n n-binary sequential relati n (″next state=set ting data″), and the keeping functi n is used t carry ut the self-l ping sequential relati n (″next state=present state″).This is a new meth d f r MSI pr grammable c unter t change its applicati n directi n. Keyw ords:pr grammable c unter;binary sequence;n n-binary sequence;l gic