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:
Oct. 25, 2005
Filed:
Dec. 23, 2002
Moriyasu Banno, Kanagawa, JP;
Moriyasu Banno, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A data processing system incorporates a central processing unit to decode and execute given instructions; a memory to store given data; a bus interface unit, provided between the central processing unit and the memory, to start a read bus cycle to read data from the memory, a write bus cycle to write data to the memory, or a dummy bus cycle different from the read and write bus cycles; and a read-modify-write unit provided between the central processing unit and the bus interface unit. The read-modify-write unit includes a modify-requirements buffer to store modify requirements having modify data output from the central processing unit and an operation control signal; and a modify operation circuit to apply an operation processing to read data output from the bus interface unit with the modify data output from the modify-requirements buffer under the operation control signal to output an operation result to the bus interface unit, as write data.