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:
Jan. 04, 2000
Filed:
Nov. 12, 1996
Tetsuhiko Okada, Hachioji, JP;
Naoki Hamanaka, Tokyo, JP;
Naohiko Irie, Kawasaki, JP;
Takehisa Hayashi, Sagamihara, JP;
Tetsuya Mochida, Ebina, JP;
Masabumi Shibata, Kawasaki, JP;
Youichi Tanaka, Kanagawa-ken, JP;
Yasuhiro Ishii, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a multi-processor system interconnecting processor units, memory units, and input/output units connected to input/output devices via a crossbar switch having a plurality of ports, the transmitter of each processor unit has a circuit for determining a destination of an access request in the following manner. For an access request to a main memory, the access request is transferred to all processor units and one memory unit storing the data to be accessed. For an access request to a memory mapped register of the input/output device, the access request is broadcast to all input/output units. For an access request to a memory mapped register belonging to any one of the processor units, memory units, and input/output units, the access request is broadcast to all units via the crossbar switch.