JPS5764835A - Direct memory access system of microprocessor - Google Patents

Direct memory access system of microprocessor

Info

Publication number
JPS5764835A
JPS5764835A JP55140951A JP14095180A JPS5764835A JP S5764835 A JPS5764835 A JP S5764835A JP 55140951 A JP55140951 A JP 55140951A JP 14095180 A JP14095180 A JP 14095180A JP S5764835 A JPS5764835 A JP S5764835A
Authority
JP
Japan
Prior art keywords
data
memory
microprocessor
memory access
direct memory
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
JP55140951A
Other languages
Japanese (ja)
Inventor
Yoichi Isogawa
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 JP55140951A priority Critical patent/JPS5764835A/en
Publication of JPS5764835A publication Critical patent/JPS5764835A/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
    • G06F13/20—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)
  • Microcomputers (AREA)

Abstract

PURPOSE:To simplify the hardware and to increase the data transfer capacity, by fixing the number of transfer words of a direct memory access and securing the corresponding between the direction of data transfer and the hardware. CONSTITUTION:A direct memory access device 3 is provided to each terminal device of a microprocessor controller. When a data is transmitted from a microprocessor 1, the address setting of a transmitting memory address register 31 is started to read the produced data out of a memory 2 by a fixed number of words through a control circuit 32. This data is transmitted to a terminal device through a bus bar 8 via a terminal device interface circuit 35. When the data is received, an area is secured in the memory 2. At the same time, an address is set to an address register 33, and the received data is written into the memory 2 by a fixed number of words through a control circuit 34 by an instruction given from the circuit 35.
JP55140951A 1980-10-07 1980-10-07 Direct memory access system of microprocessor Pending JPS5764835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55140951A JPS5764835A (en) 1980-10-07 1980-10-07 Direct memory access system of microprocessor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55140951A JPS5764835A (en) 1980-10-07 1980-10-07 Direct memory access system of microprocessor

Publications (1)

Publication Number Publication Date
JPS5764835A true JPS5764835A (en) 1982-04-20

Family

ID=15280600

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55140951A Pending JPS5764835A (en) 1980-10-07 1980-10-07 Direct memory access system of microprocessor

Country Status (1)

Country Link
JP (1) JPS5764835A (en)

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