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:
Jun. 20, 1978
Filed:
Dec. 29, 1975
Masamichi Ishibashi, Tokyo, JA;
Shigeru Miyajima, Tokyo, JA;
Fujitsu Limited, Kawasaki, JA;
Abstract
A subchannel memory access control system for use in a data processing system having multiplexor channels to which input/output control units of a first group are connected, and block multiplexor channels to which input/output control units of second and third groups are connected. A plurality of input/output devices of corresponding groups are connected to each control unit. The subchannel memory comprises unit control word memory domains corresponding on a one-to-one basis to the input/output devices of the first group; a pool of unit control word memory domains for use by each operational input/output device connected to an input/output control unit of the second group, to be unshared and dedicated to its respective input/output device; unit control word memory domains of the third group corresponding on a one-to-one basis to each of the input/output control units of the third group, each unit control word memory domain to be shared or utilized in common by the plurality of input/output devices controlled by its respective input/output control unit of the third group; and an assign table memory domain for storing address information to access the respective unit control word memory domains of the second and third groups.