Electrical computers and digital data processing systems: input/ – Input/output data processing
Patent
1997-05-15
1999-07-27
Kizou, Hassan
Electrical computers and digital data processing systems: input/
Input/output data processing
710 8, 710 15, 710 62, 365 52, G06F 1300
Patent
active
059283360
ABSTRACT:
Provided is a PC card and peripheral device having a non-volatile memory device that can perform erasing and re-writing at a relatively high operational voltage, and an internal circuit that is driven at a relatively low voltage, and is accomplished by a typical PC card that comprises: (a) an EEPROM serving as a non-volatile memory device; (b) a built-in battery having a low voltage output that supports the reading of the EEPROM but does not support erasing and re-writing; (c) a power line for conveying from a host computer system the high voltage required for erasing and re-writing the EEPROM; (d) an MPU that can be driven by a voltage supplied by the built-in battery; (e) an interface circuit that can be driven at a voltage supplied by the built-in battery; and (f) a switching circuit for selecting either the built-in battery or the power line as the power supply for the EEPROM. When the host computer system or the PC card access the EEPROM to read data, the switching circuit selects the built-in battery as the power source for the EEPROM. Then, an operational voltage that is adequate only for reading is supplied to the EEPROM. When the computer system accesses the EEPROM to write data, the switching circuit selects as the power source for the EEPROM the power line that conveys a high voltage. Therefore, the writing of data in the EEPROM can be performed.
REFERENCES:
patent: 5546590 (1996-08-01), Pierce
patent: 5572478 (1996-11-01), Sato et al.
patent: 5671368 (1997-09-01), Chan et al.
patent: 5671374 (1997-09-01), Postman et al.
patent: 5724544 (1998-03-01), Nishi
patent: 5845139 (1998-12-01), Fischer et al.
Bogdon Bernard D.
Hossain Abu
International Business Machines - Corporation
Kizou Hassan
McConnell Daniel E.
LandOfFree
PC card and peripheral device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with PC card and peripheral device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PC card and peripheral device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-873854