JPH01228028A - System control device - Google Patents

System control device

Info

Publication number
JPH01228028A
JPH01228028A JP63054669A JP5466988A JPH01228028A JP H01228028 A JPH01228028 A JP H01228028A JP 63054669 A JP63054669 A JP 63054669A JP 5466988 A JP5466988 A JP 5466988A JP H01228028 A JPH01228028 A JP H01228028A
Authority
JP
Japan
Prior art keywords
bus
signal
common bus
common
circuit
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
JP63054669A
Other languages
Japanese (ja)
Inventor
Satoshi Sugano
Original Assignee
Nec 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 Nec Corp filed Critical Nec Corp
Priority to JP63054669A priority Critical patent/JPH01228028A/en
Publication of JPH01228028A publication Critical patent/JPH01228028A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To control to output a system resetting signal after it is confirmed that a common bus is not used by confirming the condition of a signal to show that the use right of the common bus may be newly given.
CONSTITUTION: When a bus arbitrating circuit 9 detects that the use right of a common bus 20 is newly given by a signal (d), a bus use request is received from respective devices connected to the bus 20. It is informed that the use right of the common bus 20 is given to the device having a priority bus use right by a signal (f) and the use right of the common bus 20 is given to a bus time out detecting circuit 4 and a bus arbitrating control circuit 6 by a signal (g). When it is detected by the circuit 4 that the use of the common bus 20 is not completed in the constant time, the use of the common bus 20 is forcibly assembled by a signal (i) and it is informed to the bus arbitrating control circuit 6 that the time-out occurs.
COPYRIGHT: (C)1989,JPO&Japio
JP63054669A 1988-03-08 1988-03-08 System control device Pending JPH01228028A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63054669A JPH01228028A (en) 1988-03-08 1988-03-08 System control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63054669A JPH01228028A (en) 1988-03-08 1988-03-08 System control device

Publications (1)

Publication Number Publication Date
JPH01228028A true JPH01228028A (en) 1989-09-12

Family

ID=12977185

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63054669A Pending JPH01228028A (en) 1988-03-08 1988-03-08 System control device

Country Status (1)

Country Link
JP (1) JPH01228028A (en)

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