Electrical computers and digital processing systems: support – Computer power control
Reexamination Certificate
2005-12-27
2005-12-27
Lee, Thomas (Department: 2115)
Electrical computers and digital processing systems: support
Computer power control
C365S229000, C365S228000
Reexamination Certificate
active
06981159
ABSTRACT:
When power stoppage of a main power supply is detected during a normal operation, a power controller switches a power supply for a DRAM from the main power supply to a battery power supply and makes an instruction signal for instruction a self-refresh mode to a memory controller active. In response to this, the memory controller changes a clock enable signal for the DRAM to a low level to establish the self-refresh mode of the DRAM, and, after, the self-refresh mode of the DRAM is established, supplying of power to the memory controller is stopped. The clock enable signal for the DRAM is maintained to the low level by pull-down resistance even when the supplying of power to the memory controller is stopped from a condition that the signal is changed to the low level in the self-refresh mode, thereby maintaining the self-refresh mode of the DRAM.
REFERENCES:
patent: 5640357 (1997-06-01), Kakimi
patent: 6065124 (2000-05-01), Lee
patent: 6212599 (2001-04-01), Baweja et al.
patent: 6317657 (2001-11-01), George
patent: 6848058 (2005-01-01), Sinclair et al.
patent: 6874095 (2005-03-01), Usui
Canon Kabushiki Kaisha
Lee Thomas
Tran Vincent
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