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The ongoing integration of fine-grained power management features alreadyestablished in CPU-driven Systems-on-Chip (SoCs) enables both traditional FieldProgrammable Gate Arrays (FPGAs) and, more recently, hybrid Programmable SoCs(pSoCs) to reach more energy-sensitive application domains (such as, e.g.,automotive and robotics). By combining a fixed-function multi-core SoC withflexible, configurable FPGA fabric, the latter can be used to realizeheterogeneous Real-time Systems (RTSs) commonly implementing complexapplication-specific architectures with high computation and communication(I/O) densities. Their dynamic changes in workload, currently active powersaving features and thus power consumption require precise voltage and currentsensing on all relevant supply rails to enable dependable evaluation of thevarious power management techniques. In this paper, we propose a low-cost18-channel 16-bit-resolution measurement (sub-)system capable of 200 kSPS(kilo-samples per second) for instrumentation of current pSoC developmentboards. To this end, we join simultaneously sampling analog-to-digitalconverters (ADCs) and analog voltage/current sensing circuitry with a Cortex M7microcontroller using an SD card for storage. In addition, we propose toinclude crucial I/O components such as Ethernet PHYs into the power monitoringto gain a holistic view on the RTS's temporal behavior covering not onlycomputation on FPGA and CPUs, but also communication in terms of, e.g.,reception of sensor values and transmission of actuation signals. We present anFMC-sized implementation of our measurement system combined with two GigabitEthernet PHYs and one HDMI input. Paired with Xilinx' ZC702 development board,we are able to synchronously acquire power traces of a Zynq pSoC and the twoPHYs precise enough to identify individual Ethernet frames.

Cost-effective Energy Monitoring of a Zynq-based Real-time System including dual Gigabit Ethernet