A mapping method to improve the performance and lifespan of PCM data encryption and writing

Abstract

The invention discloses a mapping method for improving PCM data encrypted writing performance and service life, which includes: reading the data in the PCM memory and obtaining the original data through the mapping data recovery method; comparing the original data and the written back data word by word, and updating Modification identification of the written back data; identify the modified word and the unmodified word in the written back data, and map the modified word to the front part of the data, map the unmodified word to the rear part of the data, and obtain the mapped data; use the LCTR counter to encrypt the mapping The modified word in the post-data, and use the TCTR counter to encrypt and map the unmodified word in the post-data to obtain the encrypted data; update the cyclic movement identifier, and perform forward cyclic movement to the encrypted post-encryption data to obtain new write-back data; use DCW writes new writeback data into PCM memory. The invention improves the writing performance of PCM data encryption, reduces writing energy consumption, optimizes wear leveling at the same time, and effectively improves the service life of the PCM.

Description

technical field [0001] The invention belongs to the field of performance optimization of a phase change memory, and more specifically relates to a mapping method for improving the encryption writing performance and lifespan of PCM data. Background technique [0002] Phase Change Memory (PCM, Phase Change Memory) is a new type of non-volatile memory composed of chalcogenide materials. It uses the reversible physical state of the material to store data information. High density, fast read and write speed, low power consumption and other advantages. [0003] PCM memory cells have a limited number of writes, typically 10 7 -10 9 Second-rate. When the storage unit accesses data, the chalcogenide material will frequently switch between the crystalline state and the amorphous state. After reaching a limited number of switching times, it will lose its phase transition characteristics, so that its physical state cannot be changed by applying a voltage, and it cannot continue to st...

AI Technical Summary

Problems solved by technology

At the same time, the study found that the modified data in the cache line is less and scattered in each byte of the cache line. The existing DEUCE scheme needs multiple write units when writing the cache line data back to the PCM memory.

[0007] In general, there is still room for optimization in the existing methods for PCM data encryption and writing performance and life improvement

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