The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2008
Filed:
Jul. 26, 2002
Jiro Tateyama, Kanagawa, JP;
Jiro Tateyama, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
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.