JPS59167730A - Bus connecting device - Google Patents

Abstract

PURPOSE:To use a shared input/output device without another communication device by providing a means, which holds a bus use request of its own system and detects a bus use request of another system to report it to a processor of its own system, in a bus connecting device. CONSTITUTION:When a processor 42 uses an input/output device 53 connected to a common bus 3, the processor 42 uses an inter-processor communication device to request the use to a processor 41. If the use of the input/output device 53 can be interrupted, the processor 41 transmits a release command to a bus connecting device 71. When the processor 41 interrupts the processing and releases the bus connecting device 71 from the connection state, a bus connecting device 72 detects this state change and starts the data transfer to the processor 42. When receiving the command of data transfer from the bus connecting device 72, the processor 42 transmits a connecting command to the bus connecting device 72 to set the common bus 3 to the connection state and uses the input/output device 53.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection device in a data processing device, particularly for use in a dual computer system.

<Prior art> In general, data processing systems aimed at achieving high reliability employ a dual system or more system using at least two or more processing devices, as shown in Figure 1. There are many things. In other words, the 11% 11/month duplex computer system consists of the first and second processing units 41 and 42 connected to stations 1 and 2, respectively, and the first to fourth human outputs. storage heights 151 to 54; first and second storage devices 61 and 62 connected to buses 1 and 2, respectively; first and second storage devices connected between buses 1 and 2 and node 3, respectively; bus coupling devices 71 and 72, and an inter-processing device communication device 8 connected between buses 1 and 2.In such a dual-system computer system, mainly from the viewpoint of cost, input Output devices are often shared.In order to share input/output devices, for example, the first
Or a system to which the second processing devices 41 and 42 are connected,
It is necessary to separate the system to which the shared third and fourth input/output devices 53 and 54 are connected.
54 is connected to the bus 3, and the systems to which the processing devices 41 and 42 are connected, respectively, are coupled to the shared input/output devices 53 and 54 using first and second bus coupling devices 71 and 72, respectively.

Conventionally, in such a dual system system, an ml for configuring a common bus and a second bus coupling device 71 are used.
, 72, there is a drawback in that it requires an inter-processing device communication device 8 for synchronizing the processing devices 41, 42. In other words, in a dual-system computer system as shown in Figure 1, when a system connected to a common bus interrupts processing for some reason, the connection between this system and the common bus is canceled, and the other system is disconnected from the common bus. Notifies the system processing device of the interruption of processing. On the other hand, the other system's processing device that has been contacted connects the common bus to its own system's bus and takes over the processing. When one processing device interrupts processing, it contacts the processing device of the other system, and if necessary, the processing device of the other system resumes the processing, which is called synchronization. Then synchronization is essential.

As explained above, in a dual system computer system, buses 1 and 2 and buses 3 can be connected to
In addition to the bus coupling devices 71 and 72, a communication means 8 is required to take over processing to another system. By using a bus coupling device that is equipped with means for detecting interruptions in the processing of its own system and communicating with other systems, a redundant TL-8 machine system can be realized without separately providing the above-mentioned communication means.

However, in addition to the redundant computer/system shown in FIG. 2 and the redundant computer system shown in FIG. 4 bus coupling devices 73 and 74. In a redundant computer system including a shared fifth input/output device 55 connected to the bus 4, the fifth input/output device 55 is a processing bag! t
41 and 42 need to be used alternately, it is possible that a processing device of another system is requesting the use of the input/output device 55.
There is also a need for a means to detect and communicate this to the own processing device. The processing device of the own system suspends processing if possible (if the input/output device 55 is not used in the own system) based on the communication. The bus coupling device informs other systems of the interruption of its own processing, and the processing devices of other systems then
Therefore, the input/output device t55 can be used.
It was necessary to prepare a separate means for more detailed communication.

<Object of the Invention> The object of the present invention is to provide a means for detecting when the processing of the own system connected to a common bus is interrupted and communicating this to other systems, as well as a means for other systems to use the input/output devices of the common bus. By using a bus coupling device that is equipped with a means of collapsing to communicate the request for use, the above disadvantages can be eliminated, and a dual system computer can be used without providing a separate means of communication between the two systems. The object of the present invention is to provide a bus coupling device that realizes the system.

Another object of this invention is to provide a bus coupling device that can realize a flexible duplex system that is advantageous not only in terms of operability but also in terms of cost by easily realizing this connection stage. be.

<Summary of the Invention> The bus coupling device according to the present invention is used in a dual-system computer/system, and has a first bus and a second bus that are used for the first and second processing system, respectively. , a common bus shared by the first and second processing units. Each bus coupling device can set the two buses in a coupled state or a released state, and is composed of first and second bus coupling circuits, a connection control circuit, a use request circuit, and a start control circuit. . The first and second bus coupling circuits are cascade-connected to each other, and the first and second bus coupling circuits are connected to each other in cascade.
2 (7) It performs logical control of the interface between the lotus and the common bus. The connection control circuit monitors the state of the second bus coupling device in the first processing device system, monitors the state of the first bus coupling device in the second processing device system, and monitors the state of the first bus coupling device in the second processing device system. This is to set a mountain system to a connected state when the system is not in a connected state. Each use request circuit holds a request for use of the shared bus of its own processing unit. The activation control circuit detects a change in the bus connection state of the other system and the occurrence of a request to use the other system, and performs control so that data transfer can be started in the own system.

<Example> Next, an example of the present invention will be described in detail with reference to FIG. 3 and the following drawings. FIG. 3 is a partial diagram showing a portion of an example of a dual system computer system using the bus coupling device according to the present invention. These bus coupling devices 71 and 72 are prepared for each processing system, that is, for each bus 1 and 2, and the pair of bus coupling devices 71 and 72 are connected to one common bus 3 on the common bus side.
This is a summary of the following. FIG. 3 shows that the first bus 1 and the common bus 3 are coupled to a first bus coupling device 71 connected to the first bus 1. In FIG.

An interface bus 9 between the bus coupling devices 71 and 72 is prepared for monitoring the status of the bus coupling device 72 of another system.

In FIG. 3, when the first processing device 41 connected to the first bus 1 uses the input/output device 53 connected to the common bus 3, it is connected to the first bus coupling device 71. Send a command. Upon receiving this connection command, the first bus coupling device 71 performs a connection operation and notifies the first processing device 41 of the result.

When the common bus 3 is not in the coupled state by the second bus coupling device 72, the first bus coupling device 71 is in the coupled state. Thereafter, the first processing device 41 can use the input/output device 53 connected to the common bus 3.

Further, the second bus coupling device 72 connected to the second bus 2 learns that the first bus coupling device 71 is in the coupled state via the interface bus 9 between the bus coupling devices. Here, the processing device 4 connected to the second bus 2
2 sends a connection command to the second bus coupling device 72 in order to use the input/output device 53 connected to the common bus 3. state, the second bus coupling device 72 cannot enter the coupling state. When the second processing device 42 uses the traffic device 53 connected to the common bus 3, the processing device The intersystem communication device 8 is used to request the use of the first processing device 41. When it is possible to interrupt the use of the input/output device @53, the first processing device 41 A release command is sent to the coupling device 71.If the first processing device 41 interrupts processing and the first bus coupling device 71 is released from the coupling state, the second bus coupling device 72 The state change is detected and the data transfer is started for the second processing device 42.The second processing device 42, which receives the data transfer command from the second bus coupling device 72, starts the data transfer from the second bus coupling device 72. A connection command is sent to the coupling device 72 to bring the common bus 3 into a coupled state, and the people output device 53 is used.

FIG. 4 is a flowchart showing the procedure of this process.

FIG. 5 is a flowchart showing the processing procedure when using the first and second bus coupling devices according to the present invention. In FIG. 5, the first bus coupling device 71 is in a coupling state using the same procedure as the conventional process. Second processing device 4
2 uses the input/output device 53 connected to the common bus 3, it sends a use request command to the second bus coupling device 72. The first bus coupling device 71 in the coupled state detects that the second bus coupling device 72 has received the use request command, and starts data transfer to the first processing device 41. The first processing device 41, which has received the command for data transfer, sends a release command to the first 7-channel coupling device @71, if possible. Thereafter, the second processing device [72 can use the input/output device 53 using the same procedure as before.

Next, the configuration of the first and second bus coupling devices 71 and 72 will be specifically explained using FIG. 6. In the bus coupling bag f & near 1 of Era 1, the bus coupling circuit fM121 connects the first bus coupling circuit 1211, which controls the interface with the first bus 1 of the first processing unit system, and the common bus 3. and a second bus coupling circuit 1212 for controlling the interface. Connection commands and release commands from the first processing unit +i, 41 are sent to the first bus coupling circuit 121.
1 to the first contact □ and is transmitted to the control circuit 101. The first processing device 41 is also notified of the result of the connection operation.
The bus coupling circuit 1211 performs this. Still, the use request command from the first processing device 41 is also sent to the first bus coupling circuit 1211.
from there to the first use request circuit 131. The second bus coupling circuit 1212 that controls coupling with the common bus 3 has meaning only in the coupled state. The connection control circuit 101 puts the first bus coupling bag w71 in a coupled state and a released state in response to a connection command and a release command from the first processing device 41. The connection control circuit 101 is still connected to the bus coupling device near 1.
The bus coupling device 72 of the other system is connected to the bus coupling device 72 of the other system by the interface bus 9 between 72, and has the function of notifying the bus coupling device 72 of the other system about the coupling state of the own system and the presence or absence of a usage request, and the coupling state of the other system and the presence or absence of a usage request. Contains a function to know. The use request circuit 131 holds a use request for the input/output device connected to the common bus 3 of the first processing device 41 until the connected state is reached. The activation control circuit 111 activates the first bus coupling circuit 1211 when notification to the first processing device 41 is required. Conventional bus coupling device and first or second bus coupling device 71, 72 according to the present invention
There is no essential difference between the two except for the use request circuit iat, 132.

Next, the first or second bus coupling device 7 according to the present invention
1, 72 connection control circuit 101. Start-up control circuit 111
, and a configuration example of the use request circuit 131 is shown in the 71st screen. The bus coupling circuit 1211 connects the connection control circuit 101 and the startup control circuit 1 in response to a connection command from the first processing device 41.
All the CNCT signals are sent to 11.

In the connection control circuit 101, when all the CNCT signals are received, the first D-type flip-flop 511, which controls the coupling state and release state, is set to the coupling state. However, when the bus coupling device 72 of another system is already in the coupled state, a BUSY- signal indicating the coupled state is sent via the driver/receiver circuit 561, and this causes the first The knob 511 cannot be set.

In the startup control circuit 111, the timing generation circuit 531 is activated, and after the time necessary for the connection operation has elapsed, the T and RIG signals are outputted via the OR gate circuit 551, and thereby the first bus coupling circuit 1211 is started. Further, the first bus coupling circuit 1211 sends R to the connection control circuit 101 in response to a release command from the first processing device 41.
LS-Send signal. As a result, the connection control circuit 10
1, the first D-type flip-frog 511 is reset to a released state.

Let us consider a case where the bus coupling bag 72 of the other system changes from the coupled state to the released state. Driver/Register 6 circuit 561
The BUSY- signal sent out via the BUSY- signal causes the second
A D-type flip, flop 521, is set. Second
The signal sent out from the D-type flip-flop 521 is O
It is sent out via the R gate circuit 551 and activates the first bus coupling circuit 1211. The second D-type flip-flop 521 is reset when a connection command is received. Thereby, it is possible to notify the first processing device 41 of the own system of the interruption of the processing of the other system.

The above operations are also performed in conventional bus coupling devices, and there is essentially no difference from the bus coupling devices 71 and 72 according to the present invention.

The bus coupling circuit 1211 sends a USE + signal to the use request circuit 131 in response to a use request command from the first processing device 41. When the USE signal is sent, the use request circuit 131 sets the third D-type flip-flop 571. However, when the mountain range is in the combined state, the use request command is meaningless and is not reset by the ENB- signal indicating the combined state.

Now, let us consider the case when the bus coupling device 72 of another system receives a use request command. The REQT+ signal sent via the driver/receiver circuit 581 sets the fourth D-type flip-flop 591 for use request detection in the activation control circuit IH.

When the own system is in the free state, detection of use requests from other systems is meaningless, so the fourth D-type Frisopflotz 591 is E.
Not set by the NB+ signal. The signal sent out from the fourth D-type flip-flop 591 is sent out via the OR gate) circuit 551, and is sent out to the first bus coupling circuit 2.
11. The fourth D-type flip-flop 591 is reset by the release command. Thereby, the request for use of the other system can be notified to the first processing device 41 of the own system.

<Effects> As explained above, the present invention provides a bus coupling device with means for retaining bus usage requests of its own system, detecting bus usage requests of other systems, and notifying the mountain system processing equipment. In a dual side computer system, there is an advantage that a shared input/output device can be used when needed, without requiring any other means of communication.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing the configuration of a conventional double thread computer system, FIG. 30 is a block diagram showing an example of the connection of a pair of bus coupling devices according to the present invention, and FIG.
5 and 5 are flowcharts showing an example of processing performed using a cross-combining device, FIG. 6 is a block diagram showing an embodiment of a pair of cross-combining devices according to the present invention, and FIG. FIG. 2 is a block diagram showing a configuration example of a connection control circuit, a start control circuit, and a use request circuit in the bus coupling device according to the present invention. 1.2, 3.4... Bus, 41, 42... Processing device, 51-55... Input/output device, 61.62... Storage device, 71-74... Bus coupling device, 8 . . . Communication device between processing device systems, 9 . . . Interface bus, 101
, 102...Connection control circuit, 111, 112...Start control circuit, 121, 122...Bus coupling circuit section, 1
31, 132...Use request circuit, 1211, 121
2, 1221, 1222...Nox coupling circuit, 51
1, 521, 571, 591- D-type fritsf. Flop, 531...timing generation circuit, 541...
・Gate circuit, 551...OR gate circuit, 561,
581... Driver/Resinoku. Application for permission filed by NEC Co., Ltd. agent Taku Himi 1. Haidon 2. Figure 4

Claims (1)

[Claims] (1) A dual bus comprising first and second ports connected to the first and second processing device systems, respectively, and a common bus shared by the first and second processing device systems. 1. and a first bus connected to the second bus and the common bus, and capable of setting the two buses in a coupled state or a released state. and in each of the second bus coupling devices, for logically controlling the interface between the first and second buses connected to the first and second processing device systems and the common bus, respectively. First and second bus coupling circuits connected in cascade with each other, the first processing device system monitors the state of the second bus coupling device, and the second processing device system monitors the state of the first bus coupling circuit. monitor the status of the bus coupling device,
a connection control circuit for setting the own system in a coupled state when the other system is not in the coupled state; and a processing device for coupling the common bus with the own system when the other system is in the coupled state. Request port 1 for holding the request of
and an activation control circuit that detects a change in the bus connection state of the other system and the occurrence of a request from the other system, and performs control to start data transfer in the own system. A coupling device to be used.