Patent ID: 6078984
Filing Date: 2000-06-20
Classification: B60R,G06F

Abstract:
A method of operating a control system which includes a nonvolatile memory unit having memory banks and a volatile memory unit for storing programs and data, and wherein access is permitted to only a single one of said memory banks of said nonvolatile memory unit at a given time point and the memory bank permitting said access is addressable by using addresses which are located within a memory bank address space, the memory bank address space being common to all memory banks and adapted to the size of the memory banks, the method comprising the steps of:driving said nonvolatile memory unit and said volatile memory unit in such a manner that said memory bank of the nonvolatile memory unit permitting said access is only accessible in part;when an addressing attempt is made via an address, which is assigned to that part of the particular memory bank of the nonvolatile memory unit which is not accessible, shifting said volatile memory unit into a state permitting an access to replace that part of the particular memory bank which is not accessible;setting the state, which permits access or refuses access, of each of the memory units by supplying corresponding memory component selection signals to said memory units; and,addressing said volatile memory unit via said address.