JPS5629732A - Bus control system - Google Patents

Bus control system

Info

Publication number
JPS5629732A
JPS5629732A JP10578379A JP10578379A JPS5629732A JP S5629732 A JPS5629732 A JP S5629732A JP 10578379 A JP10578379 A JP 10578379A JP 10578379 A JP10578379 A JP 10578379A JP S5629732 A JPS5629732 A JP S5629732A
Authority
JP
Japan
Prior art keywords
bus
unit
signal line
transfer
request
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
JP10578379A
Other languages
Japanese (ja)
Inventor
Nobuteru Morita
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 JP10578379A priority Critical patent/JPS5629732A/en
Publication of JPS5629732A publication Critical patent/JPS5629732A/en
Pending legal-status Critical Current

Links

Landscapes

  • Multi Processors (AREA)
  • Bus Control (AREA)
  • Information Transfer Systems (AREA)

Abstract

PURPOSE: To ensure a transfer of the information in accordance with the response velocity of the unit to which the transfer of the information is requested, by detecting that the unit requesting the transfer is ranked at the highest position for use of the bus to request the transfer of the information to the requested unit and then confirming the transfer reception-enable signal sent from the requested unit.
CONSTITUTION: When several requesting units desire the use of the bus, the bus use request signal line 4 is turned to 1 via the bus request FF12. In that case, if both the data effective signal line 5 and the confirmation signal line 6 are 0 and the bus allotment signal line 9 has no bus use request from the unit having a higher priority than its own unit, the bus allotting circuit 18 changes the signal line 5 into 1 via the data effective FF15 and then turns the bus state identification signal line 3 into 1 via the bus function control circuit 13.With the request of the interlock given from the requesting unit, signal line 7 is turned into 1. Receiving this signal, the requested unit turns the interlock confirmation signal line 8 into 1 in case the interlock response is possible. And also the signal 8 is sent back to the requested unit in case the interlock is possible. After this, the requesting unit delivers the data and at the same time turns signal line 6 int 1.
COPYRIGHT: (C)1981,JPO&Japio
JP10578379A 1979-08-20 1979-08-20 Bus control system Pending JPS5629732A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10578379A JPS5629732A (en) 1979-08-20 1979-08-20 Bus control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10578379A JPS5629732A (en) 1979-08-20 1979-08-20 Bus control system

Publications (1)

Publication Number Publication Date
JPS5629732A true JPS5629732A (en) 1981-03-25

Family

ID=14416735

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10578379A Pending JPS5629732A (en) 1979-08-20 1979-08-20 Bus control system

Country Status (1)

Country Link
JP (1) JPS5629732A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6015764A (en) * 1983-07-07 1985-01-26 Nec Corp Common bus control system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5057347A (en) * 1973-09-19 1975-05-19
JPS51236A (en) * 1974-06-19 1976-01-05 Tokyo Electric Power Co
JPS5361928A (en) * 1976-11-16 1978-06-02 Nippon Telegr & Teleph Corp <Ntt> Data transfer system
JPS5462740A (en) * 1977-10-28 1979-05-21 Hitachi Ltd Input-output controller

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5057347A (en) * 1973-09-19 1975-05-19
JPS51236A (en) * 1974-06-19 1976-01-05 Tokyo Electric Power Co
JPS5361928A (en) * 1976-11-16 1978-06-02 Nippon Telegr & Teleph Corp <Ntt> Data transfer system
JPS5462740A (en) * 1977-10-28 1979-05-21 Hitachi Ltd Input-output controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6015764A (en) * 1983-07-07 1985-01-26 Nec Corp Common bus control system
JPS6367700B2 (en) * 1983-07-07 1988-12-27 Nippon Electric Co

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