Memory card and data processing system

Details Memory card and data processing system Memory card and data processing system

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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patent: 2003/0202383 (2003-10-01), Shiota et al.
“The MultiMediaCard System Specification”, Version 3.3,MMCA Technical Committee, Mar. 2003.

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