Patent ID: 7275127
Filing Date: 2007-09-25
Classification: G06K,G06Q,G07F

Abstract:
1. A multi-application transponder circuit for a contactless electronic identification and/or access system including, in particular, a non-volatile memory having a segmented programmable memory space for receiving data relating to a plurality of distinct applications, the memory space including: a first memory zone segmented into several memory words each dedicated to storage of data relating to a determined application from among said plurality of distinct applications; a second memory zone, called a shared zone, segmented into several memory words each able to be allocated to storage of data relating to any application from among said plurality of distinct applications; and a third memory zone containing indications relating to the allocation of memory words of said second memory zone, at least, and for determining which memory word or words of said second memory zone are allocated to storage of data relating to a given application from among said plurality of distinct applications, wherein a first part of said third memory zone identifies the allocation of memory words of said first memory zone and wherein a second part of said third memory zone identifies the allocation of memory words of said second memory zone, and wherein the allocation of memory words of said first memory zone is pre-established and stored in said first part of the third memory zone and in that the allocation of memory words of the second memory zone is variable as a function of needs of each application and is capable of being updated by modifying the indications stored in said second part of the third memory zone.