JPS6421660A - Asynchronous data transfer system - Google Patents

Asynchronous data transfer system

Info

Publication number
JPS6421660A
JPS6421660A JP62177247A JP17724787A JPS6421660A JP S6421660 A JPS6421660 A JP S6421660A JP 62177247 A JP62177247 A JP 62177247A JP 17724787 A JP17724787 A JP 17724787A JP S6421660 A JPS6421660 A JP S6421660A
Authority
JP
Japan
Prior art keywords
signal
transition
slave device
mark
circle
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
JP62177247A
Other languages
Japanese (ja)
Other versions
JP2581694B2 (en
Inventor
Yuzuru Koga
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 JP62177247A priority Critical patent/JP2581694B2/en
Publication of JPS6421660A publication Critical patent/JPS6421660A/en
Application granted granted Critical
Publication of JP2581694B2 publication Critical patent/JP2581694B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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)
  • Information Transfer Systems (AREA)
  • Communication Control (AREA)

Abstract

PURPOSE:To decrease the number of signal lines necessary for a data transferring and to improve transferring efficiency by executing an asynchronous data transferring with three signal routes between a master device and a slave device, and obtaining meaning in the transition of signal condition due to the level change in one signal route. CONSTITUTION:When data are transmitted from a master device 10 to a slave device 20, an output signal MOB is made '1' from '0' by the instruction of an MPU 11 to an output port 14, and the signal condition is changed from (111) to (101). Then, a transition, circle-mark 1, is generated and the data transmission is informed the slave device 20. On the other hand, when the signal MOB goes to '0', a signal line 31 and an input signal SIB of the slave device 20 go to '0'. The slave device 20 changes from the initial condition (111) to the (101) and when the generation of the transition, circle-mark 1, is detected, an output signal SOC is made from '1' to '0' to respond. Thus, the signal condition on the signal lines 31 and 32 goes to (100) and a transition, circle-mark 2, is generated. The transition is repeated in the same way concerning the following and the asynchronous data transferring is executed.
JP62177247A 1987-07-17 1987-07-17 Asynchronous data transfer method Expired - Fee Related JP2581694B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62177247A JP2581694B2 (en) 1987-07-17 1987-07-17 Asynchronous data transfer method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62177247A JP2581694B2 (en) 1987-07-17 1987-07-17 Asynchronous data transfer method

Publications (2)

Publication Number Publication Date
JPS6421660A true JPS6421660A (en) 1989-01-25
JP2581694B2 JP2581694B2 (en) 1997-02-12

Family

ID=16027728

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62177247A Expired - Fee Related JP2581694B2 (en) 1987-07-17 1987-07-17 Asynchronous data transfer method

Country Status (1)

Country Link
JP (1) JP2581694B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH096724A (en) * 1995-06-23 1997-01-10 Nec Corp Data transfer system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH096724A (en) * 1995-06-23 1997-01-10 Nec Corp Data transfer system

Also Published As

Publication number Publication date
JP2581694B2 (en) 1997-02-12

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees