Concatenated pointers for radio frequency identification tags

Details Concatenated pointers for radio frequency identification tags Concatenated pointers for radio frequency identification tags

2007-08-07

2010-06-22

Elms, Richard (Department: 2824)

Static information storage and retrieval

Read/write circuit

Signals

C340S010100, C340S815780, C340S572700, C365S191000

Reexamination Certificate

active

07742348

ABSTRACT:
Methods and systems are provided for improved protection of radio frequency identification tag memory by using two or more “brownout-safe” pointer registers (instead of a single pointer register) that are logically concatenated to form a complete address for the boundary between a locked portion and an unlocked portion of the tag memory. A first pointer is a coarse pointer identifying a block of memory containing the boundary. A second pointer is a fine pointer identifying a specific location within the identified coarse block of memory. The coarse pointer may be a gray-coded or linear pointer. Similarly, the fine pointer may be a gray-coded or linear pointer.

REFERENCES:
patent: 6130602 (2000-10-01), O'Toole et al.
patent: 6734797 (2004-05-01), Shanks et al.
patent: 2007/0096919 (2007-05-01), Knadle, Jr. et al.
patent: 2008/0034183 (2008-02-01), Drago et al.

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