Patent ID: 8773888
Filing Date: 2014-07-08
Classification: G11C

Abstract:
1. A method of operating a semiconductor device including a variable resistance device, the method comprising: a first operation of applying a first voltage to the variable resistance device to change a resistance value of the variable resistance device from a first resistance value to a second resistance value, a second operation of sensing a first current flowing through the variable resistance device to which the first voltage is applied; a third operation of determining whether the first current falls within a test range corresponding to a level of multi-level data; a fourth operation of, when the first current falls within the test range, determining a second voltage used to change the resistance value of the variable resistance device from the second resistance value to the first resistance value based on a dispersion of the sensed first current; a fifth operation of applying the second voltage to the variable resistance device; and a sixth operation of repeating the applying the first voltage to the variable resistance device to which the second voltage is applied.