JPS573124A - Processing request selecting circuit - Google Patents

Processing request selecting circuit

Info

Publication number
JPS573124A
JPS573124A JP7553280A JP7553280A JPS573124A JP S573124 A JPS573124 A JP S573124A JP 7553280 A JP7553280 A JP 7553280A JP 7553280 A JP7553280 A JP 7553280A JP S573124 A JPS573124 A JP S573124A
Authority
JP
Japan
Prior art keywords
processing
processing request
circuit
request
output
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
JP7553280A
Other languages
Japanese (ja)
Inventor
Yoshiharu Iwamoto
Shuji Miki
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
Nippon Telegraph and Telephone Corp
Original Assignee
Hitachi Ltd
Nippon Telegraph and Telephone Corp
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, Nippon Telegraph and Telephone Corp filed Critical Hitachi Ltd
Priority to JP7553280A priority Critical patent/JPS573124A/en
Publication of JPS573124A publication Critical patent/JPS573124A/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
    • G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Multi Processors (AREA)
  • Bus Control (AREA)

Abstract

PURPOSE:To prevent lowering of the processing capability caused by selection of a data transfer destination in case that the data transfer destination of an input/output control device is changed. CONSTITUTION:If no IO processing request exists, the processing request of the first preference circuit 7 is selected by the inversion signal of a microprogram instruction output mu-1. At the time when execution of the processing request of the first processing queuing circuit 7 is completed, mu-2 is energized, and control is returned to an idle routine in the mu program. Since the idle routine outputs mu-3 to energize the second preference circuit 210, a processing request accumulared in the second processing queuing circuit 91 is selected and executed. The microprogram instruction output mu-1 is made to logical 0 at a proper time by the mu program performing this processing to stop temporarily execution of the prcessing request of the second processing queuing circuit 91, and a processing request IO of an input/output is executed.
JP7553280A 1980-06-06 1980-06-06 Processing request selecting circuit Pending JPS573124A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7553280A JPS573124A (en) 1980-06-06 1980-06-06 Processing request selecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7553280A JPS573124A (en) 1980-06-06 1980-06-06 Processing request selecting circuit

Publications (1)

Publication Number Publication Date
JPS573124A true JPS573124A (en) 1982-01-08

Family

ID=13578914

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7553280A Pending JPS573124A (en) 1980-06-06 1980-06-06 Processing request selecting circuit

Country Status (1)

Country Link
JP (1) JPS573124A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0731351U (en) * 1994-12-05 1995-06-13 ローム株式会社 Thermal head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0731351U (en) * 1994-12-05 1995-06-13 ローム株式会社 Thermal head

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