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Power Dissipation Reduction Mechanism for Japan Electronic Industry Development Association/Personal Computer Memory Card International Association I/O Card

IP.com Disclosure Number: IPCOM000113527D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Hatta, T: AUTHOR [+4]

Abstract

This article describes a method for reducing power dissipation that can be applied onto Japan Electronic Industry Development

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 81% of the total text.

Power Dissipation Reduction Mechanism for Japan Electronic Industry
Development Association/Personal Computer Memory Card International
Association I/O Card

      This article describes a method for reducing power dissipation
that can be applied onto Japan Electronic Industry Development

Association/Personal Computer Memory Card International Association
type cards.  Both JEIDA and PCMCIA cards comprise I/O cable for
communicating with external devices or for attaching to communication
network outlets.  These types of cards basically have a function of
cable connection.  Consequently, they can be powered down as a fatal
error in case disconnected from the cable.  Since the JEIDA/PCMCIA
standard doesn't define I/O cable interface, this article clarifies
method for detecting the cable disconnection and the means for
responding to the software which controls the PCMCIA slot's power
supply.

      This method requires Cable Detach Pin at I/O cable interface
which indicates the I/O cable connection/disconnection status with
its signal voltage level (Fig. 1A).  It is connected to Cable Detach
Sensing Circuit which resides on JEIDA/PCMCIA card and corresponds to
the change to the -STSCHG generation circuit which also resides on
JEIDA/PCMCIA card and is implemented on most of the I/O type card
generally (Fig. 1B).  As a result, the cable disconnection condition
asserts -STSHG signal which is defined in JEIDA/PCMCIA standards as
the indication of the card status change...