JPS5720829A - Channel controlling system - Google Patents

Channel controlling system

Info

Publication number
JPS5720829A
JPS5720829A JP9474780A JP9474780A JPS5720829A JP S5720829 A JPS5720829 A JP S5720829A JP 9474780 A JP9474780 A JP 9474780A JP 9474780 A JP9474780 A JP 9474780A JP S5720829 A JPS5720829 A JP S5720829A
Authority
JP
Japan
Prior art keywords
command
command word
prefetching
ser
work area
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.)
Granted
Application number
JP9474780A
Other languages
Japanese (ja)
Other versions
JPS6048778B2 (en
Inventor
Masao Hasegawa
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 JP55094747A priority Critical patent/JPS6048778B2/en
Publication of JPS5720829A publication Critical patent/JPS5720829A/en
Publication of JPS6048778B2 publication Critical patent/JPS6048778B2/en
Expired 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
    • G06F13/10—Program control for peripheral devices
    • G06F13/12—Program control for peripheral devices using hardware independent of the central processor, e.g. channel or peripheral processor
    • G06F13/122—Program control for peripheral devices using hardware independent of the central processor, e.g. channel or peripheral processor where hardware performs an I/O function other than control of data transfer

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Debugging And Monitoring (AREA)

Abstract

PURPOSE:To realize quick execution of a command prefetching process in a channel controlling system, by holding exceptional information detected during a command prefetching mode at the work area of a channel device and producing a conclusion instruction based on the external information after executing a command. CONSTITUTION:When receiving a data transfer requesting interruption from an input/output control device 19, a command word executing part 14 of a channel controlling device 13 executes a data transfer command. Then a command word prefetching part 15 prefetches the command word to be executed next to the work area of the device 13. If a memory access error is detected with the prefetching of a command word, exceptional information is stored in the work area. Then a bit SER showing the presence of an error is turned on. After the end of a transfer of the preceding data, the next command word is executed. Then the SER is reported to the input/output controlling part 13 simultaneously with the transfer of data. The part 13 received the SER and thus applies a conclusion instruction interruption to the device 13 for report of the end of a fault and when the data transfer is through. In such way, a command word prefetching process can be quickly executed without affecting the process of external information.
JP55094747A 1980-07-11 1980-07-11 Channel control method Expired JPS6048778B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55094747A JPS6048778B2 (en) 1980-07-11 1980-07-11 Channel control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55094747A JPS6048778B2 (en) 1980-07-11 1980-07-11 Channel control method

Publications (2)

Publication Number Publication Date
JPS5720829A true JPS5720829A (en) 1982-02-03
JPS6048778B2 JPS6048778B2 (en) 1985-10-29

Family

ID=14118713

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55094747A Expired JPS6048778B2 (en) 1980-07-11 1980-07-11 Channel control method

Country Status (1)

Country Link
JP (1) JPS6048778B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58114114A (en) * 1981-12-26 1983-07-07 Fujitsu Ltd Error reporting system for channel controller

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6414084U (en) * 1987-07-16 1989-01-24
JPH01117274U (en) * 1988-01-30 1989-08-08

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58114114A (en) * 1981-12-26 1983-07-07 Fujitsu Ltd Error reporting system for channel controller
JPS6213703B2 (en) * 1981-12-26 1987-03-28 Fujitsu Ltd

Also Published As

Publication number Publication date
JPS6048778B2 (en) 1985-10-29

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