Hierarchical common source line structure in NAND flash memory

Static information storage and retrieval – Floating gate – Particular connection

Reexamination Certificate

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C365S226000, C365S185180, C365S185110, C365S185230

Reexamination Certificate

active

07978518

ABSTRACT:
Each memory cell string in a generic NAND flash cell block connects to a Common Source Line (CLS). A value for applying to the CSL is centrally generated and distributed to a local switch logic unit corresponding to each NAND flash cell block. For source-line page programming, the distribution line may be called a Global Common Source Line (GCSL). In an array of NAND flash cell blocks, only one NAND flash cell block is selected at a time for programming. To reduce power consumption, only the selected NAND flash cell block receives a value on the CSL that is indicative of the value on the GCSL. Additionally, the CSLs of non-selected NAND flash cell blocks may be disabled through an active connection to ground.

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