JPS564957A - Bus circuit - Google Patents

Bus circuit

Info

Publication number
JPS564957A
JPS564957A JP7971079A JP7971079A JPS564957A JP S564957 A JPS564957 A JP S564957A JP 7971079 A JP7971079 A JP 7971079A JP 7971079 A JP7971079 A JP 7971079A JP S564957 A JPS564957 A JP S564957A
Authority
JP
Japan
Prior art keywords
data
bus
circuits
impedance
output
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
JP7971079A
Other languages
Japanese (ja)
Inventor
Kyoji Kameo
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 JP7971079A priority Critical patent/JPS564957A/en
Publication of JPS564957A publication Critical patent/JPS564957A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Debugging And Monitoring (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To enable simple constitution to detect securely several pieces of data being sent out to bus lines at the same time by setting each output impedance of a data output circuit much higher than the impedance of a load method. CONSTITUTION:To the outputs of respective data output circuits 141-14m of bus circuit 11, interposing constant-current sources 161-16m for increasing their output impedance, viewed from the side of bus line 13a, high enough are connected, so that the output impedance of circuits 141-14m will be much greater than the resistance value of load resistor 18. Therefore, voltage level V0 generates differences about as many as (k) between the transmission of one data to bus line 13a through the operation of one data output circuit and that of the k-number data through the operation of the k-number circuits. When reference voltage Vrf is greater than voltage v0, one desired data output circuit is put into operation and when not, relation V0<Vrf is never born and an abnormal signal is sent out of output terminal 20, so that it well be informed that data extracted from bus receiver 14 are in error.
JP7971079A 1979-06-26 1979-06-26 Bus circuit Pending JPS564957A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7971079A JPS564957A (en) 1979-06-26 1979-06-26 Bus circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7971079A JPS564957A (en) 1979-06-26 1979-06-26 Bus circuit

Publications (1)

Publication Number Publication Date
JPS564957A true JPS564957A (en) 1981-01-19

Family

ID=13697754

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7971079A Pending JPS564957A (en) 1979-06-26 1979-06-26 Bus circuit

Country Status (1)

Country Link
JP (1) JPS564957A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59501232A (en) * 1982-09-28 1984-07-12 エルクシイ I/O channel bus
US5185735A (en) * 1991-07-10 1993-02-09 Hewlett Packard Company Lan noise monitor
KR100780403B1 (en) * 2006-07-31 2007-11-29 정진구 A wiper apparatus for car rearview

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59501232A (en) * 1982-09-28 1984-07-12 エルクシイ I/O channel bus
US5185735A (en) * 1991-07-10 1993-02-09 Hewlett Packard Company Lan noise monitor
KR100780403B1 (en) * 2006-07-31 2007-11-29 정진구 A wiper apparatus for car rearview

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