Differential Operation Oriented Multiple-Valued Encoding and Circuit Realization for Asynchronous Data Transfer

Tomohiro TAKAHASHI, Naoya ONIZAWA, Takahiro HANYU

Summary :

This paper presents an asynchronous data transfer scheme using 2-color 2-phase dual-rail encoding based on a differential operation and its circuit realization. The proposed encoding enables seamless asynchronous data transfer without inserting a spacer, because each logic value is represented by two kinds of codewords with dual-rail, called "color" data. Since the difference x-x between components of a codeword (x,x) becomes constant in every valid state, the data-arrival state can be detected by calculating the difference x-x. From the viewpoint of circuit implementation, during the state transition, since the dual-rail x and x are defined so as to transit differentially, the compatibility with a comparator using a differential amplifier becomes high, which results in reduction of the cycle time. It is evaluated using HSPICE simulation with a 0.18 µm CMOS technology that communication speed using the proposed dual-rail encoding becomes 1.4 times faster than that using conventional dual-rail encoding.

• Publication: IEICE TRANSACTIONS on Electronics Vol.E87-C No.11 pp.1928-1934
• Publication Date: 2004/11/01
• Type of Manuscript: Special Section PAPER (Special Section on New System Paradigms for Integrated Electronics)

Authors

Tomohiro TAKAHASHI
Naoya ONIZAWA
Takahiro HANYU

Keyword

differential operation,  delay-insensitive,  dual-rail encoding,  point-to-point communication