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Neural Network Accelerator on ECP5

FPGA-based NN accelerator for MNIST digit classification using a 100% open-source toolchain: Yosys, nextpnr, and openFPGALoader

uttam-kumarUttam Kumar
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An NN inference accelerator for MNIST on ECP5 using open-source tools that provide accessibility, reproducibility, and no license fees.
The toolchain: Yosys → nextpnr → Project Trellis → openFPGALoader
Hardware: Radiona ULX3S, ECP5 LFE5U-85F
Results: Recognizes digits 0-9 with 94% accuracy on the hardware
Link to GitHub: github.com/uttamcoomar/NN_Digits

hackadayionnproj.jpg

A screenshot

JPEG Image - 134.86 kB - 04/21/2026 at 10:39

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demo.mkv

Video showing the NN accelerator in action

x-matroska - 8.24 MB - 04/21/2026 at 10:34

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