发明申请
- 专利标题: Magnetoresistive random access memory and driving method thereof
- 专利标题(中): 磁阻随机存取存储器及其驱动方法
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申请号: US11067670申请日: 2005-03-01
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公开(公告)号: US20050195644A1公开(公告)日: 2005-09-08
- 发明人: Sumio Ikegawa , Yoshihisa Iwata , Kenji Tsuchida
- 申请人: Sumio Ikegawa , Yoshihisa Iwata , Kenji Tsuchida
- 申请人地址: JP Tokyo
- 专利权人: KABUSHIKI KAISHA TOSHIBA
- 当前专利权人: KABUSHIKI KAISHA TOSHIBA
- 当前专利权人地址: JP Tokyo
- 优先权: JP2004-062788 20040305
- 主分类号: G11C11/15
- IPC分类号: G11C11/15 ; G11C11/00
摘要:
The number of read errors can be reduced, and a large read signal can be produced. A method of driving a magnetoresistive random access memory including memory cells, a state of which is switched between binary resistance values using a single kind of write pulses is proposed, the method comprising: selecting a memory cell; reading a resistance value, which is one of the binary resistance values, of the selected memory cell, the resistance value read being defined as a first resistance value; performing a first write operation on the selected memory cell using the write pulse to change the resistance value of the selected memory cell to the other of the binary resistance values; reading the other of the binary resistance values, which is defined as a second resistance value; comparing the second resistance value with the first resistance value, and determining data originally stored in the selected memory cell based on the comparison result; and performing a second write operation on the selected memory cell using the write pulse to change the second resistance value of the selected memory cell to the first resistance value.
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