JPS57162011A - Sense byte holding system - Google Patents

Sense byte holding system

Info

Publication number
JPS57162011A
JPS57162011A JP56047425A JP4742581A JPS57162011A JP S57162011 A JPS57162011 A JP S57162011A JP 56047425 A JP56047425 A JP 56047425A JP 4742581 A JP4742581 A JP 4742581A JP S57162011 A JPS57162011 A JP S57162011A
Authority
JP
Japan
Prior art keywords
input
controller
output
ioc1
cpu1
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
JP56047425A
Other languages
Japanese (ja)
Inventor
Fumio Fukazawa
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56047425A priority Critical patent/JPS57162011A/en
Publication of JPS57162011A publication Critical patent/JPS57162011A/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
    • G06F13/40—Bus structure
    • G06F13/4004—Coupling between buses
    • G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)

Abstract

PURPOSE:To elevate reliability of a system and its throughput, by holding discriminating information of the system and its sense byte by an input/output device, and designating and sending out the discriminating information of its sense byte, in a sense byte holding system of a magnetic disk subsystem. CONSTITUTION:A CPU1 issued an input/output instruction to an input/output device I01 through a route of a channel CH1, and an input/output controller IOC1. Subsequently, system discriminating information ID for informing that the input/output operation has been started by the instruction of the CPU1 is held by the device I01. When a fault occurs in the course of this operation, the controller IOC1 generates a sense byte to the device IO1, and also informs a unit check to the CPU1. The CPU1 which has received this report issues a sense instruction together with the information ID of the CPU to a route E having the same information ID as a route A, in case when the controller IOC1 is busy and the route A cannot be utlized. An input/output controller IOC2 which has received this instruction reads the sense byte from the controller IOC1 and reports it to a channel 2.
JP56047425A 1981-03-31 1981-03-31 Sense byte holding system Pending JPS57162011A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56047425A JPS57162011A (en) 1981-03-31 1981-03-31 Sense byte holding system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56047425A JPS57162011A (en) 1981-03-31 1981-03-31 Sense byte holding system

Publications (1)

Publication Number Publication Date
JPS57162011A true JPS57162011A (en) 1982-10-05

Family

ID=12774794

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56047425A Pending JPS57162011A (en) 1981-03-31 1981-03-31 Sense byte holding system

Country Status (1)

Country Link
JP (1) JPS57162011A (en)

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