Patent ID: 9305647
Filing Date: 2016-04-05
CPC Classification: G11B,G11C

Claim Text:
1. A write operation method for a phase change memory, comprising: generating a corresponding voltage pulse signal according to to-be-written data when the phase change memory performs a write operation; applying the voltage pulse signal to a phase change material comprised in a phase change storage unit corresponding to the to-be-written data when the phase change memory performs the write operation; applying the voltage pulse signal to a voltage divider resistor serially connected to the phase change material when the phase change memory performs the write operation; comparing voltage values at both ends of a sampling resistor with a threshold voltage to generate an indicator value, wherein the indicator value is corresponding to data stored in the phase change storage unit; determining, according to the indicator value, whether the data that is stored in the phase change storage unit and is corresponding to the indicator value is the same as the to-be-written data; skipping writing the to-be-written data into the phase change storage unit corresponding to the to-be-written data when the data that is stored in the phase change storage unit and is corresponding to the indicator value is the same as the to-be-written data; and writing the to-be-written data into the phase change storage unit corresponding to the to-be-written data when the data that is stored in the phase change storage unit and is corresponding to the indicator value is different from the to-be-written data, wherein generating the corresponding voltage pulse signal according to the to-be-written data, applying the voltage pulse signal to the phase change material comprised in the phase change storage unit corresponding to the to-be-written data, and applying the voltage pulse signal to the voltage divider resistor serially connected to the phase change material comprise: