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- W4320713062 abstract "This article presents a compact, robust, and transposable SRAM in-memory computing (IMC) macro to support feed forward (FF) and back propagation (BP) computation within a single macro. The transpose macro is created with a clustering structure, and eight 6T bitcells are shared with one charge-domain computing unit (CCU) to efficiently deploy the DNNs weights. The normalized area overhead of clustering structure compared to 6T SRAM cell is only 0.37. During computation, the CCU performs robust charge-domain operations on the parasitic capacitances of the local bitlines in the IMC cluster. In the FF mode, the proposed design supports 128-input 1b XNOR and 1b AND multiplications and accumulations (MACs). The 1b AND can be extended to multi-bit MAC via bit-serial (BS) mapping, which can support DNNs with various precision. A power-gated auto-zero Flash analog-to-digital converter (ADC) reducing the input offset voltage maintains the overall energy efficiency and throughput. The proposed macro is prototyped in a 28-nm CMOS process. It demonstrates a 1b energy efficiency of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$166vert 257$ </tex-math></inline-formula> TOPS/W in FF-XNOR <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$vert $ </tex-math></inline-formula> AND mode, and 31.8 TOPS/W in BP mode, respectively. The macro achieves <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$80.26% vert 85.07%$ </tex-math></inline-formula> classification accuracy for the CIFAR-10 dataset with 1b <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$vert 4text{b}$ </tex-math></inline-formula> CNN models. Besides, 95.50% MNIST dataset classification accuracy (95.66% software accuracy) is achieved by the BP mode of the proposed transpose IMC macro." @default.
- W4320713062 created "2023-02-15" @default.
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- W4320713062 date "2023-05-01" @default.
- W4320713062 modified "2023-09-23" @default.
- W4320713062 title "A 28 nm 16 Kb Bit-Scalable Charge-Domain Transpose 6T SRAM In-Memory Computing Macro" @default.
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- W4320713062 doi "https://doi.org/10.1109/tcsi.2023.3244338" @default.
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