Patent ID: 8489801
Filing Date: 2013-07-16
Classification: G06F

Abstract:
1. A memory device comprising: a word memory array formed of non-volatile resistive sense memory (RSM) cells; a first index array formed of volatile content addressable memory (CAM) cells; a second index array formed of non-volatile RSM cells, wherein the memory device is configured as a cache for a non-volatile main memory and operates to output word data from the word memory array during a data retrieval operation when input request data matches tag data stored in the first index array, to write tag data to the first index array and to the second index array during a data storage operation in which word data are written to the word memory array, and to copy the tag data stored in the second index array to the first index array during a device reinitialization operation; and a volatile register of at least one volatile memory cell, wherein the memory device is further adapted to initiate a copying process in which the tag data stored in the second index array is output and copied to the first index array responsive to a data value stored in the volatile register established by a loss of power to the volatile register so that the copying process will restart responsive to a subsequent loss of power to the volatile register prior to a conclusion of said copying process.