Operating data processing system involves setting changeover bit before internal read operation to permit copying of original memory contents to shadow memory, then clearing bit

摘要

The method involves placing data in shadow memories (SSE,SSA) in both read and write directions, setting a changeover bit before an internal read operation that permits copying of the contents of the original memory to the shadow memory (SSA) for the internal read operation and clearing the changeover bit after the internal read operation. Independent claims are also included for the following: a software module for a data processing system for implementing the method.