JPS54131835A - Information process system - Google Patents

Information process system

Info

Publication number
JPS54131835A
JPS54131835A JP3987278A JP3987278A JPS54131835A JP S54131835 A JPS54131835 A JP S54131835A JP 3987278 A JP3987278 A JP 3987278A JP 3987278 A JP3987278 A JP 3987278A JP S54131835 A JPS54131835 A JP S54131835A
Authority
JP
Japan
Prior art keywords
bus
unit
request
signal
transfer
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
JP3987278A
Other languages
Japanese (ja)
Inventor
Takashi Yamazaki
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 JP3987278A priority Critical patent/JPS54131835A/en
Publication of JPS54131835A publication Critical patent/JPS54131835A/en
Pending legal-status Critical Current

Links

Landscapes

  • Multi Processors (AREA)
  • Bus Control (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE: To increase the number of the controlable processor by tiering the bus bar to be connected with plural units of processors as well as to avoid the fault, if occurred at one tier bus, from affecting buses of other tiers.
CONSTITUTION: The system includes 1st bus control unit 1, 2nd bus control units 21W23, processors 311W342 plus buses 4 and 51W53. The request sounding is given to unit 311, 312 ... in which unit 21 is connected to bus 51. In response to the request sounding, transfer requrest signal 5b and address 5e are sent out together from unit 311. Thus, whether the transfer request belongs to the unit connected to the bus of other tier is decided by address 5e at unit 21. And in case the request is of the upper-rank tier (such as bus 4), transfer request signal 4b is transmitted to upper bus control unit 1 in response to request sounding signal 4a of bus 4. In case the request signal is accepted at unit 1, unit 21 informs so to bus 5 by transmitting request acceptance signal 5c. At the same time, the connection is secured between data bus 4e and 5e as well as between address bus 4f and 5f so as to ensure execution of the transfer action.
COPYRIGHT: (C)1979,JPO&Japio
JP3987278A 1978-04-04 1978-04-04 Information process system Pending JPS54131835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3987278A JPS54131835A (en) 1978-04-04 1978-04-04 Information process system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3987278A JPS54131835A (en) 1978-04-04 1978-04-04 Information process system

Publications (1)

Publication Number Publication Date
JPS54131835A true JPS54131835A (en) 1979-10-13

Family

ID=12565062

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3987278A Pending JPS54131835A (en) 1978-04-04 1978-04-04 Information process system

Country Status (1)

Country Link
JP (1) JPS54131835A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62219826A (en) * 1986-03-20 1987-09-28 Mitsubishi Electric Corp Gateway of load control system
JPH01183757A (en) * 1988-01-18 1989-07-21 Nippon Signal Co Ltd:The Bus extending device for computer system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62219826A (en) * 1986-03-20 1987-09-28 Mitsubishi Electric Corp Gateway of load control system
JPH01183757A (en) * 1988-01-18 1989-07-21 Nippon Signal Co Ltd:The Bus extending device for computer system

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