System Level Power Modeling and Simulation of High-End Industrial Network-on-Chip

Today's System on Chip (SoC) technology can achieve unprecedented computing speed that is shifting the IC design bottleneck from computation capacity to communication bandwidth and flexibility. This paper presents an innovative methodology for automatically generating the energy models of a versatile and parametric on-chip communication IP (STBus). Eventually, those models are linked to a standard SystemC simulator, running at BCA and TLM abstractionlevel. To make the system power simulation fast and effective, we enhanced the STBus class library with a new set of power profiling features ("Power API"), allowing to perform power analysis either statically (i.e.: total avg. power) or at simulation runtime (i.e.: dynamic profiling). In addition to random patterns, our methodology has been extensively benchmarked with the high-level SystemC simulation of a real world multi-processor platform (MP-ARM). It consists of four ARM7TDMI processors accessing a number of peripheral targets (including several banks of SRAMs, Interrupt's slaves and ROMs) through the STBus communication infrastructure. A remarkable amount of SW layers are executed on top of MP-ARM platform, including a distributed real-time operating system (RTEMS) and a set of multi-tasking DSP applications. The power analysis of the benchmark platform proves to be effective and highly correlated, with an average error of 9% and a RMS of 0.015 mW vs. the reference (i.e. gate level) power figures.