发明授权
- 专利标题: Erase method for a dual bit memory cell
- 专利标题(中): 双位存储单元的擦除方法
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申请号: US10119366申请日: 2002-04-08
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公开(公告)号: US06901010B1公开(公告)日: 2005-05-31
- 发明人: Darlene G. Hamilton , Eric M. Ajimine , Binh Le , Edward Hsia , Ken Tanpairoj
- 申请人: Darlene G. Hamilton , Eric M. Ajimine , Binh Le , Edward Hsia , Ken Tanpairoj
- 申请人地址: US CA Sunnyvale
- 专利权人: Advanced Micro Devices, Inc.
- 当前专利权人: Advanced Micro Devices, Inc.
- 当前专利权人地址: US CA Sunnyvale
- 代理机构: Amin & Turocy, LLP
- 主分类号: G11C16/02
- IPC分类号: G11C16/02 ; G11C16/04 ; G11C7/00
摘要:
An erase methodology of flash memory cells in a multi-bit memory array with bits disposed in normal and complimentary locations. An erase verify of bits in the normal locations is performed and if a bit in the normal location fails and if the maximum erase pulse count has not been reached, erase pulses are applied to both the normal bit and the complimentary bit. An erase verify of bits in the complimentary locations is performed and if a bit in the complimentary location fails and if the maximum erase pulse count has not been reached, erase pulses are applied to both the complimentary and the normal bit locations. If the bits pass the erase verify, the bits are subjected to a soft programming verify. If the bits are overerased and if the soft programming pulse count has not been reached a soft programming pulse is applied to the overerased bit.
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