DEVICE AND METHOD FOR PATCHING CODE RESIDING ON A READ ONLY MEMORY MODULE UTILIZING A RANDOM ACCESS MEMORY FOR STORING A SET OF FIELDS, EACH FIELD INDICATING VALIDITY OF CONTENT OF A GROUP, AND FOR RECEIVING AN ADDRESS OF A MEMORY PORTION OF THE READ ONLY MEMORY

摘要

A device and a method for patching code residing on a ROM module, the device comprising a patch detect logic and a patch translation logic, the method comprising the steps of: (I) providing a set of M fields, each field indicating a validity of a content of a GROUP of at least two memory words stored in the ROM module. (II) receiving a request to provide a content of a requested memory portion located at an ADDRESS within the ROM module, the requested memory word being a part of a requested GROUP, the requested GROUP is associated to a selected field out of the M fields. (III) fetching a selected field associated to the requested memory portion. (IV) checking the selected field and accordingly either (a) providing a patched code if the selected field indicates that the requested GROUP is not valid; else (b) providing a content of the requested memory portion.