Background threshold voltage shifting using base and delta threshold voltage shift values in non-volatile memory

• Main Authors: Papandreou, Nikolaos, Fisher, Timothy J, Koltsidas, Ioannis, Pletka, Roman A, Pozidis, Charalampos, Tomic, Sasa, Parnell, Thomas, Fry, Aaron D, Camp, Charles J, Ioannou, Nikolas
• Format: Patent
• Language: English
• Published: 05.03.2019
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; INFORMATION STORAGE; PHYSICS; STATIC STORES

In one embodiment, a computer program product includes a computer readable storage medium having program instructions embodied therewith. The program instructions are executable by a processing circuit to cause the processing circuit to perform a method that includes determining, after writing data to a non-volatile memory block, one or more delta threshold voltage shift (TVSΔ) values. One or more overall threshold voltage shift values is calculated for the data written to the non-volatile memory block. The one or more overall threshold voltage shift values are stored. The method also includes reading one or more TVS values from a non-volatile controller memory, and resetting a program/erase cycle count since last calibration after calibrating the one or more overall threshold voltage shift values. The one or more TVSΔ values and the program/erase cycle count since last calibration are stored to the non-volatile controller memory.