JPS5729126A - Bus control system - Google Patents

Bus control system

Info

Publication number
JPS5729126A
JPS5729126A JP10392780A JP10392780A JPS5729126A JP S5729126 A JPS5729126 A JP S5729126A JP 10392780 A JP10392780 A JP 10392780A JP 10392780 A JP10392780 A JP 10392780A JP S5729126 A JPS5729126 A JP S5729126A
Authority
JP
Japan
Prior art keywords
adapters
signal
bus
request
lines
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
JP10392780A
Other languages
Japanese (ja)
Other versions
JPS594732B2 (en
Inventor
Makoto Yamanouchi
Toshitaka Hara
Satoshi Ito
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 JP55103927A priority Critical patent/JPS594732B2/en
Publication of JPS5729126A publication Critical patent/JPS5729126A/en
Publication of JPS594732B2 publication Critical patent/JPS594732B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system
    • G06F13/368—Handling requests for interconnection or transfer for access to common bus or bus system with decentralised access control
    • G06F13/37—Handling requests for interconnection or transfer for access to common bus or bus system with decentralised access control using a physical-position-dependent priority, e.g. daisy chain, round robin or token passing

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Bus Control (AREA)
  • Microcomputers (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To constitute a large-scale system bus easily by providing different request-to-use lines in parallel to adapters connected to a bus in common, and by connecting the adapters in series by a priority discrimination signal line. CONSTITUTION:Between adapters 2-4 and a right-of-using deciding circuit 1, request-to-use lines REQs 0-3 differing in priority level are provided in parallel, and the adapters are connected to them optionally. Those adapters are connected together in series by a priority discrimination signal line PRO. A circuit 1 monitors requests to use the bus from the adapters through the lines REQs 0-3 and, when those requests arrive, selects one request line having top priority to send its level to permit-to-use-bus signal lines ACKs 0 and 1 and ACKSTB. Each adapter, when not sending the request or not having a level corresponding a permit signal, flows a signal PRO to a following adapter, and an adapter having the level corresponding to the permit signal fetches the signal PRO to obtain the right of using the bus, thereby stopping the transmission of the signal PRO to the next stage.
JP55103927A 1980-07-29 1980-07-29 Bus control method Expired JPS594732B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55103927A JPS594732B2 (en) 1980-07-29 1980-07-29 Bus control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55103927A JPS594732B2 (en) 1980-07-29 1980-07-29 Bus control method

Publications (2)

Publication Number Publication Date
JPS5729126A true JPS5729126A (en) 1982-02-17
JPS594732B2 JPS594732B2 (en) 1984-01-31

Family

ID=14367056

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55103927A Expired JPS594732B2 (en) 1980-07-29 1980-07-29 Bus control method

Country Status (1)

Country Link
JP (1) JPS594732B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59226922A (en) * 1983-06-07 1984-12-20 Nec Corp Bus controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59226922A (en) * 1983-06-07 1984-12-20 Nec Corp Bus controller
JPH0128971B2 (en) * 1983-06-07 1989-06-07 Nippon Electric Co

Also Published As

Publication number Publication date
JPS594732B2 (en) 1984-01-31

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