Patent ID: 9224451
Filing Date: 2015-12-29
Classification: G11C

Abstract:
1. A method for operating a dynamic random access memory device comprising: providing a clock signal to a clock terminal of the dynamic random access memory device; selecting one of a first operating mode and a second operating mode of the dynamic random access memory device, the first operating mode, when selected, corresponding to the dynamic random access memory device periodically refreshing a first number of word lines, and the second operating mode, when selected, corresponding to the dynamic random access memory device periodically refreshing a second number of word lines different from the first number; providing a self-refresh command to a command terminal of the dynamic random access memory device; and providing a self-refresh exit command to the command terminal of the dynamic random access memory device, wherein an access command to the dynamic random access memory device can be issued a first period of time following the self-refresh exit command when the first operating mode was selected, and an access command to the dynamic random access memory device can be issued a second period of time shorter than the first period of time following the self-refresh exit command when the second operating mode was selected.