JPS5753166A - Flow control system of data line - Google Patents

Flow control system of data line

Info

Publication number
JPS5753166A
JPS5753166A JP55128261A JP12826180A JPS5753166A JP S5753166 A JPS5753166 A JP S5753166A JP 55128261 A JP55128261 A JP 55128261A JP 12826180 A JP12826180 A JP 12826180A JP S5753166 A JPS5753166 A JP S5753166A
Authority
JP
Japan
Prior art keywords
flow control
ccu1
signal line
transmission
data transmission
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
JP55128261A
Other languages
Japanese (ja)
Inventor
Tsugio Sugawara
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 JP55128261A priority Critical patent/JPS5753166A/en
Publication of JPS5753166A publication Critical patent/JPS5753166A/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
    • G06F13/38—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
    • G06F13/4221—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus
    • G06F13/4226—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus with asynchronous protocol

Abstract

PURPOSE:To release look-in of the program of a communication control device from the time limit and use the transmission and receiving buffer of the communication control device commonly, by providing a signal line for flow control independently of the data transmission line. CONSTITUTION:If a communicatin control device CCU1 cannot receive data during the communcation between an I/O devicde 2 and the CCU1, a signal line 5 for flow control is turned on to stop data transmission from the I/O device 2 temporarily. When the CCU1 becomes a receivable state again, the signal line 5 for flow control is turned on to start transmission of the I/O device 2 again. Consequently, a data transmission line 3 connecting the CCU1 and the I/O device 2 is controlled by the signal line 5 for flow control, and the transmission side is controlled by the state of the receiving side.
JP55128261A 1980-09-16 1980-09-16 Flow control system of data line Pending JPS5753166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55128261A JPS5753166A (en) 1980-09-16 1980-09-16 Flow control system of data line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55128261A JPS5753166A (en) 1980-09-16 1980-09-16 Flow control system of data line

Publications (1)

Publication Number Publication Date
JPS5753166A true JPS5753166A (en) 1982-03-30

Family

ID=14980467

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55128261A Pending JPS5753166A (en) 1980-09-16 1980-09-16 Flow control system of data line

Country Status (1)

Country Link
JP (1) JPS5753166A (en)

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