基于74LSl61的扭环形计数器自启动设计

为探索MSI（MediumScaleIntegratedcircuit）可编程计数器进行非常规使用改变应用方向的逻辑修改技术，探讨了基于74LSl61的扭环形计数器自启动设计问题，提出了MSI可编程计数器改变应用方向的逻辑修改方法。通过对可编程计数器74LSl61的状态输出进行逻辑修改改变计数规律，将状态输出反馈到预置数输入端，实现“次态=预置数”的时序关系，并进行自启动逻辑修改设计。可实现扭环形计数器自启动设计，从而实现逻辑功能扩展，简化了扭环形计数器的设计过程。

Self-Correction Design Based on Twisted Ring Counter 74LS161

The self-correction is designed based 74LS161 twisted ring counter, aiming at exploring logic modification technique of MSI （Medium Scale Integrated circuit） programmable counter by unconventional use of changing the application direction, that is to change the counting rules by changing the logic output state of programmable counter 74LS161, achieve the timing relationships of ＂next state = setting data＂ by that the state output the feedback to the preset number of inputs and to modify self-correction logic design, achieve the self-cor- rection design of twisted ring counter, thus achieve the logical extensions. The Innovation is to propose the logic modification method of MSI programmable counter changing the application direction, Design progress of twisted ring counter is simplified.