JPS57117035A - Data transfer device of asynchronous device - Google Patents

Data transfer device of asynchronous device

Info

Publication number
JPS57117035A
JPS57117035A JP443581A JP443581A JPS57117035A JP S57117035 A JPS57117035 A JP S57117035A JP 443581 A JP443581 A JP 443581A JP 443581 A JP443581 A JP 443581A JP S57117035 A JPS57117035 A JP S57117035A
Authority
JP
Japan
Prior art keywords
buffer
data
outputted
dma
signal
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
JP443581A
Other languages
Japanese (ja)
Other versions
JPS619656B2 (en
Inventor
Masao Osawa
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.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing 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 Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP443581A priority Critical patent/JPS57117035A/en
Publication of JPS57117035A publication Critical patent/JPS57117035A/en
Publication of JPS619656B2 publication Critical patent/JPS619656B2/ja
Granted 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
    • G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
    • G06F13/28—Handling requests for interconnection or transfer for access to input/output bus using burst mode transfer, e.g. direct memory access DMA, cycle steal

Landscapes

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

Abstract

PURPOSE:To eliminate a loss of a data, by providing a buffer even if a device for which other DMA control is required is connected to the same computer, when executing the DMA of plural words. CONSTITUTION:In case when a data is transferred to a main storage device 2 from an external device 9, a signal from a synchronizing circuit 6 and each data having a frame number, from a gate circuit 8 are outputted to a buffer 11 and a buffer 4. A controlling circuit 7 outputs a signal to a gate circuit 13 so that the frame number is outputted to an address generating circuit 3 of the main storage device from the buffer 11, the first DMA signal is outputted to the buffers 11, 4, respectively, a data of the buffer 11 is written in the main storage device 2, and a data of the buffer 4 is shifted to the buffer 11. When the second DMA request signal is outputted in time T2 after the first output, a data in the buffer 11 is written in the next address of the device 2.
JP443581A 1981-01-14 1981-01-14 Data transfer device of asynchronous device Granted JPS57117035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP443581A JPS57117035A (en) 1981-01-14 1981-01-14 Data transfer device of asynchronous device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP443581A JPS57117035A (en) 1981-01-14 1981-01-14 Data transfer device of asynchronous device

Publications (2)

Publication Number Publication Date
JPS57117035A true JPS57117035A (en) 1982-07-21
JPS619656B2 JPS619656B2 (en) 1986-03-25

Family

ID=11584152

Family Applications (1)

Application Number Title Priority Date Filing Date
JP443581A Granted JPS57117035A (en) 1981-01-14 1981-01-14 Data transfer device of asynchronous device

Country Status (1)

Country Link
JP (1) JPS57117035A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6118060A (en) * 1984-07-04 1986-01-25 Nec Corp Data processing system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6118060A (en) * 1984-07-04 1986-01-25 Nec Corp Data processing system

Also Published As

Publication number Publication date
JPS619656B2 (en) 1986-03-25

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