Computer interface architecture having a power saving function

Details Computer interface architecture having a power saving function Computer interface architecture having a power saving function

1997-10-27

2000-04-25

Sheikh, Ayaz R.

Electrical computers and digital processing systems: support

Computer power control

Power conservation

713300, 713310, 713322, G06F 132

Patent

active

060556412

ABSTRACT:
An information processing apparatus such as a personal computer is capable of controlling consumption power of a digital communication line interface circuit or a modem depending on a usage state of the communication line. In one aspect, the information processing apparatus including a digital communication interface circuit connected to a digital line to communicate data, includes a link state detect circuit to ascertain a link state between the interface circuit and the communication line, and a consumption power mode change circuit to change a consumption power mode of the interface circuit depending on the link state ascertained by the detect circuit. In one aspect, a battery-driven hand-held information processing apparatus minimizing the consumption power includes an access detection circuit to monitor an access state of software to a serial interface circuit, a timer circuit to determine that a modem is not accessed for a fixed period of time, a power control circuit to turn power of a modem circuit on and off in accordance with a result from the timer circuit, a circuit to generate a signal which masks a transmission enable signal notifying the serial interface circuit that the modem is unavailable because power of the modem circuit is off, and a mask circuit operating in response to the mask signal.

REFERENCES:
patent: 5644569 (1997-07-01), Walker
patent: 5692197 (1997-11-01), Narad et al.
patent: 5752050 (1998-05-01), Hermandez et al.
patent: 5799198 (1998-08-01), Fung
patent: 5835719 (1998-11-01), Gibson et al.
patent: 5842002 (1998-11-01), Schnurer et al.

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