JPS5568756A - Polling system - Google Patents

Polling system

Info

Publication number
JPS5568756A
JPS5568756A JP14238178A JP14238178A JPS5568756A JP S5568756 A JPS5568756 A JP S5568756A JP 14238178 A JP14238178 A JP 14238178A JP 14238178 A JP14238178 A JP 14238178A JP S5568756 A JPS5568756 A JP S5568756A
Authority
JP
Japan
Prior art keywords
signal
units
cpu
terminal
register
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
JP14238178A
Other languages
Japanese (ja)
Inventor
Masato Soma
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP14238178A priority Critical patent/JPS5568756A/en
Publication of JPS5568756A publication Critical patent/JPS5568756A/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
    • G06F13/22—Handling requests for interconnection or transfer for access to input/output bus using successive scanning, e.g. polling

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To decrease the overhead due to the general polling by providing the register showing the pressence or absence of the data request within the terminal control unit along with the function to store and then fetch the addresses of the terminal units requesting the data one by one. CONSTITUTION:General polling signal GP is transmitted from the CPU to terminal control unit TCE containing terminal units T1-Tn, and unit TCE received signal GP finds out the terminal having the data transfer request among units T1-Tn to give the answer to the CPU. Then the following units are provided to unit TCE: command register 71 showing the presence or absence of the data request given from units T1-Tn; address cutter 73 which gives queuing to the addresses of units T1- Tn; and status production circuit 72 which checks the contents of register 71 with reception of signal GP from the CPU respectively. Then the address signal is transferred to the CPU in the form of the answer signal of signal GP or the signal with the message, thus reducing the overhead caused by signal GP.
JP14238178A 1978-11-20 1978-11-20 Polling system Pending JPS5568756A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14238178A JPS5568756A (en) 1978-11-20 1978-11-20 Polling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14238178A JPS5568756A (en) 1978-11-20 1978-11-20 Polling system

Publications (1)

Publication Number Publication Date
JPS5568756A true JPS5568756A (en) 1980-05-23

Family

ID=15314035

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14238178A Pending JPS5568756A (en) 1978-11-20 1978-11-20 Polling system

Country Status (1)

Country Link
JP (1) JPS5568756A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60256253A (en) * 1984-05-31 1985-12-17 Fujitsu Ltd Data transmission system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4998504A (en) * 1973-01-22 1974-09-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4998504A (en) * 1973-01-22 1974-09-18

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60256253A (en) * 1984-05-31 1985-12-17 Fujitsu Ltd Data transmission system

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