公开(公告)号：US20080158949A1

公开(公告)日：2008-07-03

申请号：US11617550

申请日：2006-12-28

申请人： Man Lung Mui ,  Seungpil Lee

发明人： Man Lung Mui ,  Seungpil Lee

IPC分类号： G11C16/04 ,  G11C16/06 ,  G11C7/00

CPC分类号： G11C7/1006 ,  G11C7/1051 ,  G11C7/106 ,  G11C7/1078 ,  G11C7/1087 ,  G11C11/5628 ,  G11C11/5642 ,  G11C16/3418

摘要： Shifts in the apparent charge stored by a charge storage region such as a floating gate in a non-volatile memory cell can occur because of electrical field coupling based on charge stored by adjacent cells. To account for the shift, compensations are applied when reading. When reading a selected word line, the adjacent word line is read first and the data stored in a set of data latches for each bit line. One latch for each bit line stores an indication that the data is from the adjacent word line. The selected word line is then read with compensations based on the different states of the cells on the adjacent word line. Each sense module uses the data from the adjacent word line to select the results of sensing with the appropriate compensation for its bit line. The data from the adjacent word line is overwritten with data from the selected word line at the appropriate time and the indication updated to reflect that the latches store data from the selected word line. The efficient use of the data latches eliminates the need for separate latches to store data from the adjacent word line.

摘要翻译： 由于基于相邻单元存储的电荷的电场耦合，可能会发生存储在非易失性存储单元中的诸如浮动栅极之类的电荷存储区域的视在电荷的变化。 为了解释这种偏差，在阅读时应用补偿。 当读取所选择的字线时，首先读取相邻的字线，并且将数据存储在每个位线的一组数据锁存器中。 每个位线的一个锁存器存储数据来自相邻字线的指示。 然后基于相邻字线上的单元格的不同状态，利用补偿来读取所选择的字线。 每个感测模块使用来自相邻字线的数据来选择感测结果，并对其位线进行适当的补偿。 来自相邻字线的数据在适当的时间用来自所选择的字线的数据被覆盖，并且指示被更新以反映锁存器存储来自所选字线的数据。 数据锁存器的有效使用消除了分离锁存器来存储来自相邻字线的数据的需要。