JPS54129941A - Cross-call control system - Google Patents

Cross-call control system

Info

Publication number
JPS54129941A
JPS54129941A JP3785978A JP3785978A JPS54129941A JP S54129941 A JPS54129941 A JP S54129941A JP 3785978 A JP3785978 A JP 3785978A JP 3785978 A JP3785978 A JP 3785978A JP S54129941 A JPS54129941 A JP S54129941A
Authority
JP
Japan
Prior art keywords
dpca
dpxa
separate mode
separate
mode bit
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.)
Pending
Application number
JP3785978A
Other languages
Japanese (ja)
Inventor
Akimasa Kato
Yutaka Hiyoshi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP3785978A priority Critical patent/JPS54129941A/en
Publication of JPS54129941A publication Critical patent/JPS54129941A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To enable an input-output controller to couple with specific control adaptor DPCA and with any DPCA in a free state, by providing separate and auto- selection modes as operation modes.
CONSTITUTION: Through interface boxes IB-0 to 3, input-output controllers DPC-0 to 3 send out select device tags to cross-call controller DPXA. At this time, a separate mode bit is shifted to the bus outs and applied to the DPXA address to indicate request "0" or "1" of DPCA and at the same time, the device address is generated. By reading the separate mode bit, DPXA executes the coupling with assigned DPCA only. If DPC generates the device tag with no separate mode bit, it is discriminated as an auto-selection mode and either DPCA can be selected freely. Consequently, access to the device can be attained without queuing and the fixed bus can be diagnosed definitely in a separate mode.
COPYRIGHT: (C)1979,JPO&Japio
JP3785978A 1978-03-31 1978-03-31 Cross-call control system Pending JPS54129941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3785978A JPS54129941A (en) 1978-03-31 1978-03-31 Cross-call control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3785978A JPS54129941A (en) 1978-03-31 1978-03-31 Cross-call control system

Publications (1)

Publication Number Publication Date
JPS54129941A true JPS54129941A (en) 1979-10-08

Family

ID=12509266

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3785978A Pending JPS54129941A (en) 1978-03-31 1978-03-31 Cross-call control system

Country Status (1)

Country Link
JP (1) JPS54129941A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6019267A (en) * 1983-07-12 1985-01-31 Nec Corp Data processing system
JPS63279358A (en) * 1987-04-17 1988-11-16 タンデム　コンピューターズ　インコーポレーテッド Digital computer system, device controller used therefor and data and command transfer control in device controller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6019267A (en) * 1983-07-12 1985-01-31 Nec Corp Data processing system
JPH0118462B2 (en) * 1983-07-12 1989-04-05 Nippon Electric Co
JPS63279358A (en) * 1987-04-17 1988-11-16 タンデム　コンピューターズ　インコーポレーテッド Digital computer system, device controller used therefor and data and command transfer control in device controller

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