title: A single 1.5-V digital chip for a 10(6) synapse neural network.
abstract: A digital-chip architecture for a 10(6)-synapse neural network is proposed. It runs on a 1.5-V dry cell to allow its use in portable equipment. An on-chip DRAM cell array stores synapse weights digitally to provide easy programmability and automatic refreshing. A pitch-matched interconnection and a combinational unit circuit for summing product allow a tight layout. A dynamic data transfer circuit and the 1.5-V operation of the entire chip reduce the power dissipation, but the parallel processing nonetheless provides high speed at the 1.5-V supply. Estimated power dissipation of 75 mW and a processing speed of 1.37 giga connections per second are predicted for the chip. The memory and the processing circuits can be integrated on a 15.4-mmx18.6-mm chip by using a 0.5-mum CMOS design rule. A scaled-down version of the chip that has an 8-kb DRAM cell array was fabricated, and its operation was confirmed.
authors.affiliation: Hitachi Ltd., Tokyo.
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: K
authors.initials: K
authors.lastname: Kimura
authors.forename: M
authors.initials: M
authors.lastname: Aoki
authors.forename: T
authors.initials: T
authors.lastname: Sakata
authors.forename: K
authors.initials: K
authors.lastname: Ito