Energy-efficient and high throughput sparse distributed memory architecture

This paper presents an energy-efficient VLSI implementation of Sparse Distributed Memory (SDM). High throughput and energy-efficient Hamming distance-based address decoder (CM-DEC) is proposed by employing compute memory [1], where computation is deeply embedded into a memory (SRAM). Hierarchical binary decision (HBD) is also proposed to enhance area- and energy-efficiency of read operation by minimizing data transfer. The SDM is employed as an auto-associative memory with four read iterations and 16×16 binary noisy input image with input error rates of 15%, 25%, and 30%. The proposed SDM achieves 39× smaller energy delay product with 14.5× and 2.7× reduced delay and energy, respectively as compared to conventional digital implementation of SDM in 45 nm SOI CMOS process with output error rate degradation less than 0.4%.