JPS56111930A - Interface control system - Google Patents

Interface control system

Info

Publication number
JPS56111930A
JPS56111930A JP1441680A JP1441680A JPS56111930A JP S56111930 A JPS56111930 A JP S56111930A JP 1441680 A JP1441680 A JP 1441680A JP 1441680 A JP1441680 A JP 1441680A JP S56111930 A JPS56111930 A JP S56111930A
Authority
JP
Japan
Prior art keywords
signal
data
service
svo
ioc
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
JP1441680A
Other languages
Japanese (ja)
Other versions
JPS592053B2 (en
Inventor
Kosuke Nishimura
Nobuyuki Kikuchi
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 JP1441680A priority Critical patent/JPS592053B2/en
Publication of JPS56111930A publication Critical patent/JPS56111930A/en
Publication of JPS592053B2 publication Critical patent/JPS592053B2/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
    • G06F13/38—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
    • G06F13/4221—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus
    • G06F13/4226—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus with asynchronous protocol

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Information Transfer Systems (AREA)

Abstract

PURPOSE:To avoid an overlook of the service-out or the data-out that is caused by an input/output device, by installing a means to store the service-in signal and the data-in signal and thus always securing a time duration larger than the prescribed value for both signals. CONSTITUTION:When the service-in signal SVI is sent from the input/output controller IOC, the channel CH stores the signal SVI as far as no data-in signal DTI is stored and turns the signal SVIM to 1. Then the service-out signal SVO is sent to the IOC from the CH when a permission is given to the writing of data into the buffer in the case of the input and when the data is put on the bus-out line in the case of the output. If the signal SVO is dropped, the signal SVIM is also dropped. Thus the signal DTI is stored, and the signal DTIM is turned to 1. Then the signal DTO is transmitted to the IOC from the CH when the same condition is satisfied as the transmission of the signal SVO. As a result, the time duration is always larger than the prescribed value for both signals SVO and DTO.
JP1441680A 1980-02-08 1980-02-08 Interface control method Expired JPS592053B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1441680A JPS592053B2 (en) 1980-02-08 1980-02-08 Interface control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1441680A JPS592053B2 (en) 1980-02-08 1980-02-08 Interface control method

Publications (2)

Publication Number Publication Date
JPS56111930A true JPS56111930A (en) 1981-09-04
JPS592053B2 JPS592053B2 (en) 1984-01-17

Family

ID=11860414

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1441680A Expired JPS592053B2 (en) 1980-02-08 1980-02-08 Interface control method

Country Status (1)

Country Link
JP (1) JPS592053B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0516848Y2 (en) * 1987-08-31 1993-05-06

Also Published As

Publication number Publication date
JPS592053B2 (en) 1984-01-17

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