Energy-efficient SNN Architecture using 3nm FinFET Multiport SRAM-based CIM with Online Learning
Lucas Huijbregts (TU Delft - Electrical Engineering, Mathematics and Computer Science, IMEC Nederland)
Hsiao Hsuan Liu (IMEC Nederland)
Paul Detterer (IMEC Nederland)
Said Hamdioui (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Amirreza Yousefzadeh (IMEC Nederland, University of Twente)
Rajendra Bishnoi (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
Current Artificial Intelligence (AI) computation systems face challenges, primarily from the memory-wall issue, limiting overall system-level performance, especially for Edge devices with constrained battery budgets, such as smartphones, wearables, and Internet-of-Things sensor systems. In this paper, we propose a new SRAM-based Compute-In-Memory (CIM) accelerator optimized for Spiking Neural Networks (SNNs) Inference. Our proposed architecture employs a multiport SRAM design with multiple decoupled Read ports to enhance the throughput and Transposable Read-Write ports to facilitate online learning. Furthermore, we develop an Arbiter circuit for efficient data-processing and port allocations during the computation. Results for a 128×128 array in 3nm FinFET technology demonstrate a 3.1× improvement in speed and a 2.2× enhancement in energy efficiency with our proposed multiport SRAM design compared to the traditional single-port design. At system-level, a throughput of 44 MInf/s at 607 pJ/Inf and 29mW is achieved.