Static information storage and retrieval – Powering
Reexamination Certificate
2006-01-03
2006-01-03
Nguyen, Van Thu (Department: 2824)
Static information storage and retrieval
Powering
C365S185220, C365S185230
Reexamination Certificate
active
06982919
ABSTRACT:
A memory card and a microcomputer with nonvolatile memory wherein operation under two different types of power supply specifications is achieved are provided.A MultiMediaCard includes a flash memory and a controller which controls the operation associated with the flash memory. When the controller judges the level of supply voltage supplied from host equipment, it operates as follows: the controller judges whether detecting point corresponding to the voltage level of 1.8V system has been exceeded. After the judgment of excess, the controller judges whether detecting point corresponding to the voltage level of 3.3V system has been exceeded. When the supply voltage is at the voltage level of 1.8V system, the controller causes the flash memory to operate in the 1.8V-system operation mode without driving regulators or level shifters. When the supply voltage is at the voltage level of 3.3V system, the controller drives the regulators and the level shifters to convert the voltage level and causes the flash memory to operate in the 3.3V-system operation mode.
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“The MultiMediaCard System Specification”, Version 3.3,MMCA Technical Committee, Mar. 2003.
Kasai Hideo
Kumahara Chiaki
Nakamura Yasuhiro
Odate Hidefumi
Shikata Atsushi
Miles & Stockbridge PC
Nguyen Dang T.
Nguyen Van Thu
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