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:
Sep. 23, 2008
Filed:
Aug. 20, 2004
Hiroshi Arita, Hitachi, JP;
Yasuhiro Nakatsuka, Tokai, JP;
Kotaro Shimamura, Hitachinaka, JP;
Yasuwo Watanabe, Hitachiota, JP;
Hiroshi Arita, Hitachi, JP;
Yasuhiro Nakatsuka, Tokai, JP;
Kotaro Shimamura, Hitachinaka, JP;
Yasuwo Watanabe, Hitachiota, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A packet communication apparatus, which includes a CPU, a memory, and a packet communication circuit, acts as an interface between a network-connected controlled object and a network terminal that remotely monitors and controls the controlled object, and transmits and receives a packet between the controlled object and the network terminal, further includes a copy and operation unit that is a hardware unit for executing the checksum calculation to check for a packet error and the copy operation. The copy and operation unit performs the packet data copy operation and the checksum calculation simultaneously between a sending buffer/receiving buffer, formed in the memory and used by the packet communication circuit, and a work area used by a communication processing program, thus reducing the load of the CPU and increasing the communication processing speed.