International Conference on Information and Knowledge Technology

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Architectural Insights: Comparing Weight Stationary and Output Stationary Systolic Arrays for Efficient Computation

Authors :

Mahdi Kalbasi¹

1- University of Isfahan

Keywords :

Systolic arrays،Convolutional Neural Networks،Output stationary،Weight stationary

Abstract :

This paper compares two prevalent architectures in systolic arrays: weight stationary and output stationary methods. Systolic arrays utilize interconnected processing elements (PEs) to perform parallel processing, making them suitable for applications in digital signal processing, image processing, and machine learning. We focus on their implementation of 2D matrix multiplication, a fundamental operation in neural networks. Simulations were conducted using Verilog HDL within the Xilinx Vivado Design Suite 2019, employing a 3x1 input matrix and a 3x3 weight matrix. Results confirmed the functionality of both architectures, with output matrices matching expected results. Weight stationary designs minimized data movement, while output stationary designs enhanced throughput through effective input data reuse. With a critical path delay of approximately 8.8 ns, corresponding to a maximum frequency of about 113 MHz, the study highlights that the critical path remains stable when scaling the number of PEs. Overall, this research validates the effectiveness of both architectures in high-performance matrix operations, offering valuable insights for future systolic array designs.