A high-speed functional memory with a capability of hamming-distance-slective data search using threshold logic circuits

摘要

This paper describes a high-speed functional memory with a capability of Hamming-distance-selective data search. In general, the conventional functional memories such as content addressable memories (CAMs) have the functions of the exact-match or nearest-match data search between stored data and an input data. In addition to the exact-match data search, the proposed functional memory is capable of retrieving the address of stored data within and with a given Hamming-distance from an input data. Moreover, a high-speed search operation is realized by using the proposed dynamic threshold logic circuits without large static power consumption. A 32× 128-bit memory macro has been designed and fabricated using a 0.35-μm CMOS technology, and its feasibility and functionality have been verified by measurement.