Bit slicing approaches for variability aware ReRAM CIM macros

it - Information Technology, vol. 65, pp. 3–12

Abstract

Abstract Computation-in-Memory accelerators based on resistive switching devices represent a promising approach to realize future information processing systems. These architectures promise orders of magnitudes lower energy consumption for certain tasks, while also achieving higher throughputs than other special purpose hardware such as GPUs, due to their analog computation nature. Due to device variability issues, however, a single resistive switching cell usually does not achieve the resolution required for the considered applications. To overcome this challenge, many of the proposed architectures use an approach called bit slicing, where generally multiple low-resolution components are combined to realize higher resolution blocks. In this paper, we will present an analog accelerator architecture on the circuit level, which can be used to perform Vector-Matrix-Multiplications or Matrix-Matrix-Multiplications. The architecture consists of the 1T1R crossbar array, the optimized select circuitry and an ADC. The components are designed to handle the variability of the resistive switching cells, which is verified through our verified and physical compact model. We then use this architecture to compare different bit slicing approaches and discuss their tradeoffs.

Authors 5

1. Christopher Bengel Aachen Institute of Electronic Materials II

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen, Institute of Electronic Materials II , D-52074 Aachen , Germany

2. Leon Dixius Aachen Institute of Electronic Materials II

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen, Institute of Electronic Materials II , D-52074 Aachen , Germany

3. Rainer M. Waser Aachen Institute of Electronic Materials II

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen, Institute of Electronic Materials II , D-52074 Aachen , Germany

4. Dirk J. Wouters Aachen Institute of Electronic Materials II

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen, Institute of Electronic Materials II , D-52074 Aachen , Germany

5. Stephan Menzel corresponding

   Forschungszentrum Jülich

   Affiliation as printed

   Forschungszentrum Jülich, Peter Grünberg Institut 7 , D-52428 Jülich , Germany