US Patent 11942153 Semiconductor memory device

According to one embodiment, a semiconductor memory device includes a first string unit including a first memory string including a first selection transistor and a first memory cell coupled to the first selection transistor, a second string unit including a second memory string including a second selection transistor and a second memory cell coupled to the second selection transistor, a first select gate line, a second select gate line, a first bit line, a second bit line, and a first word line. Both of the first select gate line and the second select gate line are selected in a first read operation. The first select gate line is selected and the second select gate line is not selected in a second read operation.