JPS55123256A - Synchronous detection system - Google Patents

Synchronous detection system

Info

Publication number
JPS55123256A
JPS55123256A JP3022579A JP3022579A JPS55123256A JP S55123256 A JPS55123256 A JP S55123256A JP 3022579 A JP3022579 A JP 3022579A JP 3022579 A JP3022579 A JP 3022579A JP S55123256 A JPS55123256 A JP S55123256A
Authority
JP
Japan
Prior art keywords
circuit
state
abnormal state
synchronous
changes
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
JP3022579A
Other languages
Japanese (ja)
Other versions
JPS6036147B2 (en
Inventor
Akio Hanazawa
Haruo Sugizaki
Taiho Higuchi
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 JP54030225A priority Critical patent/JPS6036147B2/en
Publication of JPS55123256A publication Critical patent/JPS55123256A/en
Publication of JPS6036147B2 publication Critical patent/JPS6036147B2/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
    • G06F13/38—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
    • G06F13/423—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 synchronous protocol

Abstract

PURPOSE:To make it possible to detect rapidly an abnormal state without deteriorating the data processing performance of a communication controller and also to perform cutting operation in a short time by providing a circuit which detects the abnormal state in parallel to synchronous test operation. CONSTITUTION:When the state of receiving circuit R changes from ''1'' to ''0'' at time t0 and the state of indication circuit I also changes from OFF to ON, an abnormal state of circuit cutting indication is considered to have occurred. Then, this state is immediately detected to change the state of control circuit C from ON to OFF, and the state of transmitting circuit T is also changed from ''1'' to ''0'' to complete response operation (t1-t0) of incoming disconnection in a short time (within 100ms). Namely, before a synchronous character or start flag is tested by synchronous test circuit 27, the generation of eight continuous bits of ''0'' is detected by ''0'' detection circuit 28 to send interruption signal INT to a main control part and a control program starts fixed corresponding operation, thereby detecting the abnormal state.
JP54030225A 1979-03-15 1979-03-15 Synchronous detection method Expired JPS6036147B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54030225A JPS6036147B2 (en) 1979-03-15 1979-03-15 Synchronous detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54030225A JPS6036147B2 (en) 1979-03-15 1979-03-15 Synchronous detection method

Publications (2)

Publication Number Publication Date
JPS55123256A true JPS55123256A (en) 1980-09-22
JPS6036147B2 JPS6036147B2 (en) 1985-08-19

Family

ID=12297768

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54030225A Expired JPS6036147B2 (en) 1979-03-15 1979-03-15 Synchronous detection method

Country Status (1)

Country Link
JP (1) JPS6036147B2 (en)

Also Published As

Publication number Publication date
JPS6036147B2 (en) 1985-08-19

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