Method of recognizing a card using a select signal during a...

Details Method of recognizing a card using a select signal during a... Method of recognizing a card using a select signal during a...

2007-03-06

2007-03-06

Cao, Chun (Department: 2115)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S330000, C713S340000

Reexamination Certificate

active

10716456

ABSTRACT:
A memory card is provided in which power consumption is reduced by the pull-up resistor of an input terminal and a misoperation induced by the pull-down resistor of a host apparatus is prevented. The memory card has a select terminal connected to the pull-up resistor. When the mode of the memory card is determined based on an input from the select terminal, a relatively low resistance value is selected for the pull-up resistor of the select terminal before a determination timing and the pull-up resistor is restored to an initial resistance value after the mode determination. A relatively high resistance value reduces a leakage current consumed by the pull-up resistor of the select terminal. When a pull-down resistor is connected to the terminal of a memory card host to which the memory card is attached, if the resistance value of the pull-up resistor is excessively high, it is influenced by the drawing in of a current by the pull-down resistor. If the resistance value of the pull-up resistor of the select terminal is lowered at the time of mode determination, an adverse effect of the lowering of a potential by the pull-down resistor can be circumvented.

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Hiroto Okada, “Making Full Use of Multimedia Card,” Interface, CQ Publishing Co., Ltd. Dec. 1999, vol. 25, No. 12, pp. 124-131 (with English translation).

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