VolTune: A Fine-Grained Runtime Voltage Control Architecture for FPGA Systems

2026-03-27

AI Summary

This work addresses the inefficiency of fixed, conservatively margined FPGA supply voltages that cannot dynamically adapt to runtime workloads, thereby limiting energy optimization. To overcome this limitation, the authors propose VolTune—the first fine-grained, runtime voltage regulation architecture integrated within an FPGA. VolTune embeds control logic that abstracts PMBus operations and enables a dual-path, hardware-software cooperative voltage scaling mechanism, achieving deterministic low-latency voltage transitions (end-to-end switching in only 2.3 ms) while preserving programmability. Experimental results demonstrate that VolTune incurs less than 2% overhead in static power and FPGA resources, reduces power rail consumption by up to 29.3% at 10.0 Gbps with a bit error rate (BER) of ≤10⁻⁶, and for the first time quantifies the trade-offs among voltage, energy efficiency, and reliability.

Abstract

The rapid emergence of edge computing platforms and large-scale data centers has made power efficiency a primary design constraint, particularly for data-intensive and AI-driven workloads. Field-programmable gate arrays (FPGAs) are increasingly adopted due to their flexibility and potential for energy-efficient acceleration. However, FPGA supply voltages are typically fixed at design time using conservative margins, limiting the ability to adapt power consumption to runtime conditions. This paper presents VolTune, an open-source runtime voltage control architecture that enables runtime tuning of FPGA supply voltages through FPGA-integrated control logic that abstracts low-level PMBus operations. VolTune provides both hardware-based and software-based control paths, allowing designers to balance deterministic low-latency operation against programmability. In the presented prototype, the hardware-based control path achieves a measured end-to-end voltage transition latency of 2.3 ms, while the controller adds under 2% static power overhead and under 2% FPGA resource overhead. As a representative case study, VolTune is evaluated on the GTX transceiver supply rail of a Kintex-7 platform. The results show that runtime voltage tuning exposes a bounded operating region with clear trade-offs between energy efficiency and reliability, and achieves up to approximately 29.3% rail-power reduction at 10.0 Gbps when allowing BER up to 10e-6. These results show that FPGA-integrated runtime voltage control can provide practical energy savings with low integration overhead.

Problem

• FPGA
• voltage control
• power efficiency
• runtime adaptation
• energy savings

Innovation

• runtime voltage control
• FPGA power efficiency
• fine-grained voltage tuning
• integrated PMBus abstraction
• energy-reliability trade-off