Patent ID: 11901008
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 16:
17. A operating method of a 3D flash memory including at least one string formed in a U shape to include a horizontal portion and vertical portions with respect to a substrate, the at least one string including a charge storage layer formed to extend in a hollow tube form and a channel layer filling an inside of the charge storage layer; a plurality of word lines orthogonal to and connected to the vertical portions of the at least one string; and two bit lines formed to extend parallel to the horizontal portion of the at least one string, the two bit lines being connected to two ends of the at least one string, the operating method comprising:
determining whether each of the two bit lines will be used as either a drain line or a source line, based on required voltages to be applied to the two ends of the at least one string, depending on which of a program operation, an erase operation, and a read operation is to be performed; and
applying voltages to the two ends of the at least one string through the two bit lines based on the result of determining whether each of the two bit lines will be used as either the drain line or the source line,
wherein a word line located adjacent to an upper portion of a horizontal portion of the at least one string, from among the plurality of word lines, is used as a MSL (Middle Signal Line).