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:
Apr. 16, 2013
Filed:
Sep. 01, 2010
Hiroshi Arita, Hitachi, JP;
Yasuhiro Nakatsuka, Tokai-mura, JP;
Yasuwo Watanabe, Hitachiohta, JP;
Kei Ouchi, Naka-machi, JP;
Yoshihiro Tanaka, Sagamihara, JP;
Toshinobu Kanai, Kodaira, JP;
Masanobu Tanaka, Hitachi, JP;
Kenji Furuhashi, Hitachi, JP;
Tomoaki Aoki, Omiya-machi, JP;
Hiroshi Arita, Hitachi, JP;
Yasuhiro Nakatsuka, Tokai-mura, JP;
Yasuwo Watanabe, Hitachiohta, JP;
Kei Ouchi, Naka-machi, JP;
Yoshihiro Tanaka, Sagamihara, JP;
Toshinobu Kanai, Kodaira, JP;
Masanobu Tanaka, Hitachi, JP;
Kenji Furuhashi, Hitachi, JP;
Tomoaki Aoki, Omiya-machi, JP;
Renesas Electronics Corporation, Kanagawa, JP;
Hitachi Information & Control Solutions, Ltd., Ibaraki, JP;
Abstract
A transmit packet generated by a CPUis held in a buffer(). From among packets received from Ethernet(), a packet, a destination of which is a communication device, is held in the buffer(). A packet which should be transmitted is transmitted from a transfer judging circuitto Ethernetorthrough a MAC unitor. If a transfer judging circuitjudges a packet from the Ethernetto be a packet, a destination of which is another communication device, with reference to a destination MAC address, this packet is transferred to the Ethernetthrough MAC. If a usage rate of a transferring FIFO buffer() exceeds a threshold value in the process of transmitting a packet held in a transmitting FIFO buffer() on a priority basis, the priority order of a transfer packet is made higher than that of a transmit packet so that the transfer packet is transferred to the Ethernetorin preference to the transmit packet. This prevents a transfer buffer means from overflowing.