Study On Key Circuits In Asynchronous Design Based On Null Convention Logic

With the rapid development of integrated circuits, the characteristic size oftransistor shrinks rapidly, the complexity of circuits enhance quickly. The request of thepower dissipation and the speed make the synchronous design method exhibit limitationand drawbacks on design and manufacture. As a result of that, asynchronous circuitdesign returns to the spotlight.This paper studies at the operation and storage circuits in asynchronous circuitsystem, implement these asynchronous key module circuits through the full custom byusing Null Convention Logic. First of all, the design and simulation many basic units ofthe NCL threshold gates and logic operation modules had been finished with theCadence simulation circumstance based on SMIC0.18μm CMOS technique library.Secondly, asynchronous four-phase dual-rail pipeline are studied, compare with thedifferent performance of pipeline. And through the NCL pipeline, we design a multiplierwith the function of signed numbers operation. At last, the problem of storingfour-phase dual-rail data is pointed out and improved the peripheral of the memorycircuit. Through the single-rail and the dual-rail conversion circuit, we make the datastoring in the memory is single-rail valid data in order to decrease the use of the storagespace and store the asychronous data.In this paper, the method of using full custom to implement the asynchronouscircuit has been researched. The design and implement’s technical problem of theasynchronous circuit system have been solved. It has a certain reference value forrealizing and applied researching of the asynchronous system.