METHOD, COMPUTER PROGRAM AND APPARATUS FOR PROGRAMMING PHASE-CHANGE MEMORY CELL, AND PHASE-CHANGE MEMORY DEVICE (PROGRAMMING OF PHASE-CHANGE MEMORY CELLS)

摘要

PROBLEM TO BE SOLVED: To provide a method and apparatus for programming a phase-change memory cell having s2 programmable cell states.;SOLUTION: At least one control signal V_BL is applied to produce a programming pulse for programming a cell. The at least one control signal V_BL is varied during the programming pulse to shape the programming pulse in accordance with the cell state to be programmed and produce a selected one of a plurality of programming pulse waveforms (waveforms A to D) corresponding to their respective programming trajectories for programming the cell states. The selected programming pulse waveform corresponds to a programming trajectory containing the cell state to be programmed.;COPYRIGHT: (C)2013,JPO&INPIT