MEGATRON: a 28nm Analog PCM CiM/Digital System-on-Chip for Edge GenAI at 57.5 TOPS/W and 1.52 Mparam/mm²

By Alessandro Nadalini ¹, Angelo Garofalo ¹, Lorenzo Greco ¹, Andrea Belano ^1,2, Alessio Antolini ¹, Francesco Zavalloni ¹, Andrea Lico ², Riccardo Zurla ³, Emanuela Calvetti ³, Luigi Croce ³, Marco Pasotti ³, Alessandro Cabrini ⁴, Eleonora Franchi Scarselli ¹, Davide Rossi ^1,2, Francesco Conti ^1,2
1 University of Bologna, Italy, 
² Chips-IT, Italy, 
³ STMicroelectronics, Italy, 
⁴ University of Pavia, Italy

Abstract

We present MEGATRON, a heterogeneous Edge GenAI System-on-Chip in 28nm FD-SOI CMOS technology combining a non-volatile analog in-memory-computing engine based on a 4Mi-cell phase-change memory (PCM) array with a digital RISC-V-based flexible neural processing unit. MEGATRON demonstrates up to 3.5 TOPS/W using the RISC-V processors and 57.5 TOPS/W with PCiM, at a storage density of 1.52 Mparam/mm² with 4-bit effective weight precision.

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