Power sequencing verification for FPGAs, CPUs and DSPs

摘要

Components such as FPGAs, CPUs and DSPs usually must meet very specific requirements relating to the order in which their supply voltages are powered - a process known as power sequencing. There's a power-up sequence and its reverse, the power-down sequence (also a recommended process, although not always!).During circuit design, it is important to account for the characteristics of multiple voltages for these devices during power-up and power-down, as well as during voltage interruptions. Done in the wrong order, powering up/down of voltages could lead to component damage. In addition, voltages must not exceed manufacturer-specified tolerances and, in many cases, must also comply with defined slew rates, specific delays upon reaching a target value and ramp-up times.