Memory card and data processing system
3 Assignments
0 Petitions
Accused Products
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 comprises 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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Citations
16 Claims
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1-9. -9. (canceled)
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10. A memory card, which is capable of connecting to a host system and receiving an operation voltage from said host system, comprising:
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system information including operation voltage information for said memory card;
a nonvolatile memory; and
a controller which controls operations associated with said nonvolatile memory and comprises a voltage generating circuit, wherein said nonvolatile memory is capable of operating at a first voltage level, wherein when said operation voltage information indicates that said memory card is operable at said first voltage level and said memory card is supplied with a voltage at said first voltage level as said operation voltage from said host system, said controller performs control to deactivate said voltage generating circuit and supplies said voltage at said first voltage level to said nonvolatile memory, and wherein when said operation voltage information indicates that said memory card is operable at a second voltage level different from said first voltage level, and said memory card is supplied with a voltage at said second voltage level as said operation voltage from said host system, said controller performs control to activate said voltage generating circuit for generating voltage at said first voltage level from said voltage at said second voltage level and supplies said generated voltage to said nonvolatile memory. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification