JPS643767A - Data transmission control unit in multi-cpu system - Google Patents

Data transmission control unit in multi-cpu system

Info

Publication number
JPS643767A
JPS643767A JP62158860A JP15886087A JPS643767A JP S643767 A JPS643767 A JP S643767A JP 62158860 A JP62158860 A JP 62158860A JP 15886087 A JP15886087 A JP 15886087A JP S643767 A JPS643767 A JP S643767A
Authority
JP
Japan
Prior art keywords
cpu
pull
reset
power
resistor
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
JP62158860A
Other languages
Japanese (ja)
Inventor
Kazuhiro Araki
Kaoru Hashimoto
Shuji Maruta
Hiroichi Yamada
Yoshikazu Ikenoue
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP62158860A priority Critical patent/JPS643767A/en
Publication of JPS643767A publication Critical patent/JPS643767A/en
Pending legal-status Critical Current

Links

Landscapes

  • Multi Processors (AREA)

Abstract

PURPOSE:To continue the communication operation of the system even when the power of an optional slave CPU is interrupted or reset by providing a pull-down resistor or the like to a 3-state gate side of a control line and a pull-up resistor to an output port side. CONSTITUTION:Pull-down resistors 7-1-7-3 are provided to 3-state gates 6-1-6-3 of an enable line through which a signal is sent to the host CPU 1 from CPUs 2-1-2-3 and pull-up resistors 11-1-11-3 are provided to a slave CPU side. When a CPU 2-1, for example, is subject to power-off or reset, the control input of the gate 6-1 is brought into a low level by the resistor 7-1 and the gate 6-1 is opened. Thus, an enable signal to the CPU 2-1 is inputted to the CPU 2-2. That is, even when an optional slave CPU is subject to power-off or reset, a transmission enable signal is bypassed to the slave CPU of the next stage without any operation thereby keeping the communication operation of the system.
JP62158860A 1987-06-26 1987-06-26 Data transmission control unit in multi-cpu system Pending JPS643767A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62158860A JPS643767A (en) 1987-06-26 1987-06-26 Data transmission control unit in multi-cpu system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62158860A JPS643767A (en) 1987-06-26 1987-06-26 Data transmission control unit in multi-cpu system

Publications (1)

Publication Number Publication Date
JPS643767A true JPS643767A (en) 1989-01-09

Family

ID=15680983

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62158860A Pending JPS643767A (en) 1987-06-26 1987-06-26 Data transmission control unit in multi-cpu system

Country Status (1)

Country Link
JP (1) JPS643767A (en)

Similar Documents

Publication Publication Date Title
JPS57117027A (en) Signal sending and receiving circuit
DK25186D0 (en) CIRCUIT ARRANGEMENT FOR USE IN AN INTEGRATED CIRCUIT
JPS648465A (en) Tri-state bus circuit
JPS643767A (en) Data transmission control unit in multi-cpu system
EP0322784A3 (en) Data transfer circuit
JPS5499886A (en) Sequence controller
JPS55157022A (en) Output circuit for microcomputer
JPS6479850A (en) Effective using method for bus
JPS5553341A (en) Image former
JPS643765A (en) Data transmission control unit in multi-cpu system
JPS56103725A (en) Controlling method of bus
JPS5413236A (en) Bus control system
JPS575142A (en) Data processor with interface function
JPS56147139A (en) Input and output control device
JPS5537644A (en) Input-output circuit of microcomputer
JPS57150058A (en) Information processing system
JPS55147858A (en) External device controlling circuit
JPS57168324A (en) Bus control circuit
JPS5741728A (en) Controlling system of data transfer
JPS57157324A (en) Data input and output device
JPS57174721A (en) Power supply controller
JPS5647829A (en) Data input/output system of computer
JPS56165482A (en) Abnormal diagnosing method of data transmission line
JPS57168326A (en) Device for digital input and pulse input in common
JPS57191751A (en) Integrated circuit information processing device