Data processing apparatus and power control method

Details Data processing apparatus and power control method Data processing apparatus and power control method

2008-06-24

2008-06-24

Zimmerman, Mark (Department: 2625)

Electrical computers and digital processing systems: support

Computer power control

By external command

C713S320000, C713S322000, C713S323000, C713S340000, C358S001140

Reexamination Certificate

active

07392409

ABSTRACT:
A device of this invention solely executes a power saving operation without influencing a repeater operation on a serial bus interface to which a plurality of devices are cascade-connected.A device such as a digital camera, printer, or the like, which is cascade-connected using an IEEE1394 serial bus interface, uses an IC prepared by forming both physical and link layers on a single chip. This IC has a port connected to a bus. When a power supply on the bus side is OFF, this port can insulate the bus in DC term. This device transits to a power saving mode such as a sleep mode, suspend mode, shutdown mode, or the like after an elapse of a predetermined wait time. In the shutdown mode, the system power supply of the device is turned off, but the IC can operate by electric power supplied from a cable. With this operation, a signal can be relayed between devices, and a packet for the link layer can be received. Upon receiving a LINK_ON packet, the device is restored from the power saving mode to a normal drive state.

REFERENCES:
patent: 5440747 (1995-08-01), Kiuchi
patent: 5790876 (1998-08-01), Shima et al.
patent: 6131167 (2000-10-01), Cruz
patent: 6282665 (2001-08-01), Cruz

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