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:
Jul. 21, 1998
Filed:
Jan. 03, 1995
Masahiko Saito, Hitachi, JP;
Kenichi Kurosawa, Hitachi, JP;
Yoshiki Kobayashi, Hitachi, JP;
Tadaaki Bandoh, Ibaraki-ken, JP;
Masahiro Iwamura, Hitachi, JP;
Takashi Hotta, Hitachi, JP;
Yasuhiro Nakatsuka, Hitachi, JP;
Shigeya Tanaka, Hitachi, JP;
Takeshi Takemoto, Sagamihara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A data processing system having flexibility coping with parallelism of a program comprises a plurality of processor elements for executing instructions, a main memory shared by the plurality of processor elements, and a plurality of parallel operation control facilities for enabling the plurality of processor elements to operate in synchronism. The plurality of parallel operation control facilities are provided in correspondence to the plurality of processor elements, respectively. The data processing system further comprises a multiprocessor operation control facility for enabling the plurality of processor elements to operate independently, and a flag for holding a value indicating which of the parallel operation mode or the multiprocessor mode is to be activated. The shared cache memory is implemented in a blank instruction and controlled by a cache controller so that inconsistency of the data stored in the cache memory is eliminated.