TDComp: Energy Efficient Time Domain Bitmap Compression

doi:10.1109/tcsii.2026.3705196

TDComp: Energy Efficient Time Domain Bitmap Compression

2026-06-22

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DOI：10.1109/tcsii.2026.3705196

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Bitmap compression is an essential technique to reduce the memory footprint during on-device training by exploiting activation sparsity. This brief presents a novel time-domain bitmap compression implementation, converts activation compression into activation serialization and pulse compression, eliminating the need for area and power consuming crossbar network or inverse butterfly network commonly used in parallel approaches. First, it utilizes pulses generated by a cascaded buffer delay chain to convert parallel activation into a serialized stream. Then, a pulse compression circuit is introduced to squeeze pulses corresponding to invalid activation and generate time-alignment sampling clock for the serialized stream. Finally, compressed activation is stored in proposed single-phase rising-clocked registers which explore the characteristics of activation and clock to reduce power consumption. Simulated in 28nm CMOS technology, the proposed method achieves a 68% reduction in circuit area for 128 8-bit activation compression compared to existing parallel approaches, and reduces energy per operation by 31.3%, 43.5%, 46.6%, and 24.3% for activation lengths of 16, 32, 64, and 128, respectively.

Keywords:

Time-domain computing

bimap compression

activation serialization

pulse compression

TDComp: Energy Efficient Time Domain Bitmap Compression

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