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  • An 8b-Precision 6T SRAM Com...
    Wu, Ping-Chun; Su, Jian-Wei; Chung, Yen-Lin; Hong, Li-Yang; Ren, Jin-Sheng; Chang, Fu-Chun; Wu, Yuan; Chen, Ho-Yu; Lin, Chen-Hsun; Hsiao, Hsu-Ming; Li, Sih-Han; Sheu, Shyh-Shyuan; Chang, Shih-Chieh; Lo, Wei-Chung; Wu, Chih-I; Lo, Chung-Chuan; Liu, Ren-Shuo; Hsieh, Chih-Cheng; Tang, Kea-Tiong; Chang, Meng-Fan

    IEEE journal of solid-state circuits, 2024-July, Letnik: 59, Številka: 7
    Journal Article

    This article presents a novel static random access memory computing-in-memory (SRAM-CIM) structure designed for high-precision multiply-and-accumulate (MAC) operations with high energy efficiency (EF), high readout accuracy, and short compute latency. The proposed device employs 1) a time-domain incremental-accumulation (TDIA) scheme to enable high-accumulation MAC operations while maintaining a large signal margin across MAC values (MACVs), 2) a dynamic differential-reference (D2REF) scheme based on software-hardware co-design to reduce read energy consumption, and 3) a low-dMACV-aware recursive time-to-digital converter (LMAR-TDC) for implementation with the D2REF scheme to further suppress readout energy consumption. A 28 nm 1 Mb SRAM-CIM macro fabricated using foundry-provided compact 6T-SRAM cells achieved EF of 39.31 TOPS/W and compute latency of 6.6 ns for 8b-MAC operations with 64 accumulations per cycle and near-full output precision (22b).