JPS5773436A - Bus selecting device - Google Patents

Bus selecting device

Info

Publication number
JPS5773436A
JPS5773436A JP14877280A JP14877280A JPS5773436A JP S5773436 A JPS5773436 A JP S5773436A JP 14877280 A JP14877280 A JP 14877280A JP 14877280 A JP14877280 A JP 14877280A JP S5773436 A JPS5773436 A JP S5773436A
Authority
JP
Japan
Prior art keywords
line
device number
signal
bus
controller
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
JP14877280A
Other languages
Japanese (ja)
Inventor
Tadashi Ihara
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 JP14877280A priority Critical patent/JPS5773436A/en
Publication of JPS5773436A publication Critical patent/JPS5773436A/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
    • G06F13/14—Handling requests for interconnection or transfer
    • G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system
    • G06F13/362—Handling requests for interconnection or transfer for access to common bus or bus system with centralised access control
    • G06F13/366—Handling requests for interconnection or transfer for access to common bus or bus system with centralised access control using a centralised polling arbiter

Landscapes

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

Abstract

PURPOSE:To reduce the delay of transmission for a processor having a low level in priority and to enhance the using of the system bus by designating the device number intrinsic to each processor communication channel when the selection of bus is carried out. CONSTITUTION:When a bus master controller 4 detects that no busy signal BSY is supplied to a busy line 7, the polling signal PS is transmitted to polling signal line 6 from the controller 4. At the same time, the device number is transmitted to a data line 8. The signal PS is supplied to the line 6 for each of plural processor communication channels 3. Then the signal BSY is taransmitted to a busy signal line 7 from a channel 3 that detected a transmission request and when a coincidence is obtained between the device number DN' and the own device number DN. At the same time, the data is sent to the line 8. Thus the process is carried out in order that is designated by the controller 4.
JP14877280A 1980-10-23 1980-10-23 Bus selecting device Pending JPS5773436A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14877280A JPS5773436A (en) 1980-10-23 1980-10-23 Bus selecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14877280A JPS5773436A (en) 1980-10-23 1980-10-23 Bus selecting device

Publications (1)

Publication Number Publication Date
JPS5773436A true JPS5773436A (en) 1982-05-08

Family

ID=15460311

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14877280A Pending JPS5773436A (en) 1980-10-23 1980-10-23 Bus selecting device

Country Status (1)

Country Link
JP (1) JPS5773436A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01161942A (en) * 1987-12-18 1989-06-26 Hitachi Ltd Data transmission equipment and its method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01161942A (en) * 1987-12-18 1989-06-26 Hitachi Ltd Data transmission equipment and its method

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