Patent ID: 7269064
Filing Date: 2007-09-11
Classification: G11C

Abstract:
1. A method of controlling a page buffer wherein the page buffer includes transistors connected between bit lines bit lines and a pad, wherein the transistors are driven according to a first signal that is enabled according to a read enable signal upon read operation to output a first data of a memory cell from the bit lines to a node passing through the pad, and a dual register having first and second registers that are enabled according to a second signal enabled during first and second program operations to transmit a second data from a node passing through the pad to the bit lines, wherein during the first program operation, when a cache program signal that enables the second signal is kept at a first level and a write enable signal is toggled, the first signal shifts to a second level to turn on the transistors, so the data passing through the pad is directly transmitted to the bit lines through the transistors without passing through the first and second registers, and wherein during the second program operation the cache program signal and the read enable signal are kept at the second level to output the first signal disabling the transistors and the second signal enabling the first and second registers, so the data passing through the pad is transmitted to the bit lines through the first and second registers.