Patent ID: 9606731
Date: 2017-03-28
CPC Classifications: G06F,G11C

Claim:
1. A method for operating a memory system including a random access memory (RAM) and a three-dimensional nonvolatile memory device, the three-dimensional nonvolatile memory device including a page buffer and multi-level memory cells arranged in a first row and configured to store first and second pages of data as multi-bit data, the method comprising: erasing the multi-level memory cells of the first row; receiving the first page of data and the second page of data from an external device; storing the first page of data to the RAM; storing the second data page of to the RAM; loading the first page of data to the page buffer; loading the second page of data to the page buffer; and performing a one-time program process for the multi-bit data by simultaneously programming the first page of data stored in the page buffer and the second page of data stored in the page buffer to the erased multi-level memory cells of the first row, wherein the one-time program process for the multi-bit data is completed by the simultaneously programming the first page of data and the second page of data to the erased multi-level memory cells, and wherein the first page of data and the second page of data are simultaneously programmed in the same memory cells among the erased multi-level memory cells of the first row.