A scalable architecture for binary couplings attractor neural networks

This paper presents a digital architecture with on-chip learning for Hopfield attractor neural networks with binary weights. A new learning rule for the binary weights network is proposed that allows pattern storage up to capacity α=0.4 and incurs very low hardware overhead. Due to the use of binary couplings the network has minimal storage requirements. A flexible communication structure allows cascading of multiple chips in order to build fully connected, block connected, or feed-forward networks. System performance and communication bandwidth scale linear with the number of chips. A prototype chip has been fabricated and is fully functional. A pattern recognition application shows the performance of the binary couplings network