Patent ID: 7917806

Claim:
A system for indicating status of an on-chip power supply system including multiple power supplies, comprising: a power system status register for receiving digital compliance signals, each compliance signal associated with one of the multiple power supplies, each power supply having an associated compliance level, wherein each digital compliance signal indicates whether its associated power supply is operating at the associated compliance level, and wherein the power system status register generates a power supply status signal based on the digital compliance signals indicating status of the digital compliance signals associated with the power supplies; and an output for outputting the power supply status signal, wherein if a power supply is operating at its associated compliance level, the power supply status signal indicates that the power supply is passing, and if the power supply is not operating at its associated compliance level, the power supply status signal indicates that the power supply is failing, wherein the power supply status signal is fed into Built-in Self Test (BIST) system via a latched interface or a scan chain, and wherein the BIST performs tests on memories on the chip based on the power supply status signal.