New Data Encoding Method with a Multi-Value Logic for Low Power Asynchronous Circuit Design

This paper presents an asynchronous encoding scheme using a MVL(Multi-Value Logic). This scheme reduces not only the number of wires but also the switching activities. It is achieved by the two proposed data encoding methods, RT/NRT(Return to Ternary/Non Return to Ternary) encoding and hybrid ternary one. Conventional ternary encoding makes all data lines to intermediate to generate completion signal. In RT/NRT encoding, however, data lines with transferring zero do not change to intermediate value in order to to reduce the switching activities. In hybrid tertiary encoding, it needs only two half-swing to transfer 2-bit data. Indeed, it only needs two lines. As the results, a RT/NRT encoding shows 25%. reduction in the signal transition and it achieve power reduction about 27%. comparing to the conventional ternary one. In addition, a hybrid ternary encoding achieves 23% energy reduction.