Patent ID: 11887671
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 14:
15. A storage system, comprising:
a memory controller; and
a three-dimensional (3D) memory device, comprising:
a plurality of memory cells connected to word lines and bit lines configured for addressing each of the plurality of memory cells, wherein the plurality of memory cells are vertically stacked; and
a peripheral circuit configured to program a selected memory cell, comprising:
a control circuit, configured to send a control signal to a word line driver, wherein the word line driver, according to the control signal, is configured to:
apply a program voltage on a selected word line;
apply a first pass voltage on a first group of unselected word lines;
apply a second pass voltage on a second group of unselected word lines, wherein the second pass voltage is different from the first pass voltage; and
determine a first maximum pass voltage when shifts of threshold voltages of a first set of unselected memory cells connected to the first group of unselected word lines are less than a maximum allowed shift.