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:
Feb. 17, 1987
Filed:
Sep. 06, 1983
Yoshiaki Matsubara, Tokyo, JP;
Masato Tsuru, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A data processing system having a channel processing device provided with an input/output device which requires input/output interrupt. The channel processing device responding to a request for input/output interrupt, propagating the request for input/output interrupt to a central processing unit, and reporting the state of the input/output device to the central processing unit. The channel processing device includes an interrupt detecting circuit which detects the request for input/output interrupt sent from the input/output device to the channel processing device, a status information detecting circuit which detects whether the status information sent from the input/output device to the channel processing unit together with the request for input output interrupt is a predetermined specified value, and a counting circuit which counts a predetermined constant time when the status information detecting circuit detects the predetermined specific value so that the request for input/output interrupt is sent to the central processing unit after the counting means counts the constant time.