JPS5623056A - Data transfer system - Google Patents

Data transfer system

Info

Publication number
JPS5623056A
JPS5623056A JP9896279A JP9896279A JPS5623056A JP S5623056 A JPS5623056 A JP S5623056A JP 9896279 A JP9896279 A JP 9896279A JP 9896279 A JP9896279 A JP 9896279A JP S5623056 A JPS5623056 A JP S5623056A
Authority
JP
Japan
Prior art keywords
signal
response
retrial
response signal
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
JP9896279A
Other languages
Japanese (ja)
Inventor
Toshirou Harui
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 JP9896279A priority Critical patent/JPS5623056A/en
Publication of JPS5623056A publication Critical patent/JPS5623056A/en
Pending 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
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4204—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus
    • G06F13/4208—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being a system bus, e.g. VME bus, Futurebus, Multibus
    • G06F13/4213—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being a system bus, e.g. VME bus, Futurebus, Multibus with asynchronous protocol

Landscapes

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

Abstract

PURPOSE:To prevent the system-down, by producing the failure information signal and making definite the time for retrial, if the retrial request is not released within the predetermined time even with repetitive retrials, through the addition of the response monitor circuit to the system. CONSTITUTION:With the request indication circuit 3 of the data transfer units 1, 2, the request signal 101 is fed to the common bus 100. This signal 101 is received with the transfer unit 1 or 2, and either one response signal out of the ACK response signal 102, NACK response signal 103 and WAIT response signal 104 is fed from the respective response circuit 4 to the common bus 100. Further, the transfer units 1, 2 operate the response monitor circuit 5 when the request signal 101 is transmitted to start the monitor of the response signal and the monitor is ended when the signals 102, 103 are received as response signal. Further, when the signal 104 is received, retrial is repetitively made and if the retrial is not released within predetermined time, failure information signal is produced to avoid the system-down.
JP9896279A 1979-08-02 1979-08-02 Data transfer system Pending JPS5623056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9896279A JPS5623056A (en) 1979-08-02 1979-08-02 Data transfer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9896279A JPS5623056A (en) 1979-08-02 1979-08-02 Data transfer system

Publications (1)

Publication Number Publication Date
JPS5623056A true JPS5623056A (en) 1981-03-04

Family

ID=14233688

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9896279A Pending JPS5623056A (en) 1979-08-02 1979-08-02 Data transfer system

Country Status (1)

Country Link
JP (1) JPS5623056A (en)

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