JPS5447538A - Channel device - Google Patents

Channel device

Info

Publication number
JPS5447538A
JPS5447538A JP11336177A JP11336177A JPS5447538A JP S5447538 A JPS5447538 A JP S5447538A JP 11336177 A JP11336177 A JP 11336177A JP 11336177 A JP11336177 A JP 11336177A JP S5447538 A JPS5447538 A JP S5447538A
Authority
JP
Japan
Prior art keywords
ccw
channel
input
ccr2
output device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP11336177A
Other languages
Japanese (ja)
Other versions
JPS5953566B2 (en
Inventor
Hiroaki Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP11336177A priority Critical patent/JPS5953566B2/en
Publication of JPS5447538A publication Critical patent/JPS5447538A/en
Publication of JPS5953566B2 publication Critical patent/JPS5953566B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To constitute the channel device in such a way that the input/output action which could not hitherto executed unless plural numbers of te channel command word are prepared through the program may be executed with just one command ward, and thus to shorten the time required for reading of the input/output device.
CONSTITUTION: Channel command word CCW is read out, and ahe data trasnfer is controlled based on CCW between the main memory and the input/output device. In this device, CCW is composed of the command part, the data address part, the flag part and the counter part, and channel register CCR2 is provided to read in CCW. In addition, the following component parts are added to constitute a channel device: flag bit CCR which controls the data transfer based on CCW and renews the contents of the data address part and the counter part of register CCR2; zero detector 20 which detects whether the counter part of CCR2 is zero or not; logic circuits 11W14; logical product circuits 15W18; and logic circuit 19 respectively. As a reslut, the time can be reduced for reading of the input/output device
COPYRIGHT: (C)1979,JPO&Japio
JP11336177A 1977-09-22 1977-09-22 channel device Expired JPS5953566B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11336177A JPS5953566B2 (en) 1977-09-22 1977-09-22 channel device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11336177A JPS5953566B2 (en) 1977-09-22 1977-09-22 channel device

Publications (2)

Publication Number Publication Date
JPS5447538A true JPS5447538A (en) 1979-04-14
JPS5953566B2 JPS5953566B2 (en) 1984-12-26

Family

ID=14610323

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11336177A Expired JPS5953566B2 (en) 1977-09-22 1977-09-22 channel device

Country Status (1)

Country Link
JP (1) JPS5953566B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6362025A (en) * 1986-09-03 1988-03-18 Sharp Corp Fast file access method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6362025A (en) * 1986-09-03 1988-03-18 Sharp Corp Fast file access method

Also Published As

Publication number Publication date
JPS5953566B2 (en) 1984-12-26

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