VersaPower: Power Estimation for Diverse FPGA Architectures

This paper presents VersaPower, a tool capable of modelling the power usage of many different field programmable gate array (FPGA) architectures. The latest release of the academic FPGA CAD tool, Versatile Place and Route 6.0 (VPR), supports new architecture features such as fracturable look-up tables and complex logic blocks. Past FPGA power models do not support these new features. VersaPower is designed to work closely with VPR to provide power estimation for any architecture supported by this new CAD flow. This allows researchers to investigate the effects on power usage of both new FPGA architectures, as well as new CAD algorithms. VersaPower is designed to operate with modern CMOS technologies, and is validated against SPICE using 22 nm, 45nm and 130nm technologies. Results show that for common architectures, roughly 60% of power consumption is due to the routing fabric, 30% from logic blocks and 10% from the clock network. Architectures supporting fracturable LUTs require 5-10% more power, as each CLB has additional I/O pins, increasing the sizes of local interconnect crossbars and connection boxes.