Princeton University

School of Engineering & Applied Science

Resilient, Wide-Voltage-Range RISC-V Processors in 28nm Technologies

Borivoje Nikolić, University of California, Berkeley
Engineering Quadrangle, Room B205
Thursday, December 3, 2015 - 4:30pm to 5:45pm

This talk presents a design of an energy-efficient  microprocessor that implements several techniques for operation in a very wide voltage range. A particular implementation is based on  an open Berkeley RISC-V architecture. To enable agile dynamic voltage and frequency scaling, with high energy efficiency the design implements an integrated switched-capacitor DC-DC converter. A custom-designed SRAM-based cache operates in a wide 0.45-1V supply range. Techniques that enable low-voltage SRAM operation include 8T cells, assist techniques and differential read. Architectural resiliency techniques include the use of error correction and dynamic column redundancy.  The processor is implemented by using an agile design methodology.