Method/apparatus for preserving state of an event during powerup reset sequence based on state of an event signal immediately prior to the reset

Abstract

Context or other functional settings are protected during a power up reset sequence in a computer system, without the need to save such context or settings in static memory. A signal, representing a change in the context, is delayed beyond a critical period of indeterminacy resulting from a power up sequence. Reliable signals, set before an application of power, negotiate the delay prior to an assertion of a power up reset signal. The context or settings are preserved by bypassing the reset signal. Unreliable signals, set during an application of power, are held by the delay to allow the reset signal to clear or initialize the context or settings. The reset function operates without prior knowledge, for example as saved in static memory, of the state of the context.

Dependencies are inferred from the claim text.