JPS54129938A - Data transfer unit - Google Patents

Data transfer unit

Info

Publication number
JPS54129938A
JPS54129938A JP3826378A JP3826378A JPS54129938A JP S54129938 A JPS54129938 A JP S54129938A JP 3826378 A JP3826378 A JP 3826378A JP 3826378 A JP3826378 A JP 3826378A JP S54129938 A JPS54129938 A JP S54129938A
Authority
JP
Japan
Prior art keywords
data
priority
transfer
request
signals
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
JP3826378A
Other languages
Japanese (ja)
Inventor
Kiyoshi Hori
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3826378A priority Critical patent/JPS54129938A/en
Publication of JPS54129938A publication Critical patent/JPS54129938A/en
Pending legal-status Critical Current

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  • Bus Control (AREA)

Abstract

PURPOSE: To use a data switch circuit effectively by transferring data from a requesting device with the next priority when several devices make data transfer requests at the same time while a device at the requested-transfer destination of the highest-priority requesting device is in use.
CONSTITUTION: From data-transfer requesting devices A00 to D00, transfer- destination assignment signals A20 to D20, data figure-number assignment signals A21 to D21, and transfer data A02 to D02 are transferred together with transfer request signals AO1 to D01. While data switch in-use display signal 201 does not arrive, priority decision circuit 100 operates to indicate by the highest-priority selective signals 10A to 10D what device the highest-priority request belongs to. Further, when there is the next priority request, it indicates the request by the next priority selective signal 101. In supervisory circuit 200, data transfer destination devices W00 to Z00 are selected by signals A20 to D20 and when there are not data- reception-enabled signals W01 to Z01 while the desired transfer-destination device of the highest-priority request device is in use, the request from the next-priority request device is accepted to attain the effective use of data switch circuit 300.
COPYRIGHT: (C)1979,JPO&Japio
JP3826378A 1978-03-31 1978-03-31 Data transfer unit Pending JPS54129938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3826378A JPS54129938A (en) 1978-03-31 1978-03-31 Data transfer unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3826378A JPS54129938A (en) 1978-03-31 1978-03-31 Data transfer unit

Publications (1)

Publication Number Publication Date
JPS54129938A true JPS54129938A (en) 1979-10-08

Family

ID=12520428

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3826378A Pending JPS54129938A (en) 1978-03-31 1978-03-31 Data transfer unit

Country Status (1)

Country Link
JP (1) JPS54129938A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5882327A (en) * 1981-11-11 1983-05-17 Mitsubishi Electric Corp Bus controller
JPS61109164A (en) * 1984-10-31 1986-05-27 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Bus control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5882327A (en) * 1981-11-11 1983-05-17 Mitsubishi Electric Corp Bus controller
JPS61109164A (en) * 1984-10-31 1986-05-27 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Bus control

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