The Spartan-6 measurement setup is based on the Sakura-G board from the Satoh Lab.

The provided datasets contain power traces that have been acquired by measuring the voltage drop accross a \( 2 \Omega \) shunt resistor placed at the JP2 connector. The amplified signal point J3 is measured by a digital oscilloscope through a SMA connector. An external low noise power supply voltage Keysight E36102B is used in order to provide a continuous DC voltage of 5V at the dedicated connector CN1/EXT5V (and the power switch is configured accordingly).

The digital oscilloscope used is a PicoScope 6242E. The phase of the clocks used by the target FPGA and the oscilloscope are matched in order to reduce the level of noise induced by clock jitter. In particular, the waveform generation feature enabled by the oscilloscope is used to generate a clock signal of 1.5625MHz. The latter is forwarded to the board target FPGA through a SMA connector. A single measurement channel (channel A) is used to perform the measurement and the trigger signal is fed from the GPIO connected to the target FPGA.

The power traces are sampled at 1.25GHz (resulting in 800 samples per target clock cycle) using a vertical resolution of 12 bits. As a pre-processing, sequential time samples are aggregated (i.e., summed) in order to reduce the dataset storing size. The practical reduction ratio equals 4, resulting in a practical sampling frequency of 312.5MHz with a vertical resolution of 14 bits. It results that the Spartan-6 traces have a temporal configuration similar to the one collected for the Artix-7.