JPS59186444A - Local area network station capable of remote initialization - Google Patents

Abstract

PURPOSE:To perform the operation of a station without making an unnecessary indication of initialization even when an indication of initialization is received from another station while initialization is carried out by a station which performs initialization control. CONSTITUTION:When frame storage in a receiving memory 104 is completed, a reception control circuit 103 causes an interruption through a signal line 201 to a microprocessor 110. The microprocessor 110 interrupted through the signal line 201 reads and checks a frame in the receiving memory. If the frame is an initialization indication message, a specific time, i.e. time when an information processor 20 receives the initialization indication message reception by an adapter 30 through an internal bus 4 and processes that to indicates an initialization stop to the adapter 30 through the bus 4 is set in the timer incorporated in the microprocessor 110, and the initialization indication message reception is sent out to a central processor 40 through the internal bus 4.

Description

Detailed Description of the Invention [Technical Field to which the Invention Pertains] The present invention relates to a system such as a local area network in which a plurality of stations (including computers, terminal devices, etc.) are connected to a common transmission path. It is related to initialization.

[Description of prior art]

In recent years, many local area networks with a loop topology as shown in FIG. 1 or a lotus topology as shown in FIG. 2 have come into use. In FIGS. 1 and 2, 1 is a station and 2 is a common transmission path. In such systems, there are often multiple mask stage stations and multiple slave stations.

Regarding initialization related to the present invention, there is the problem of providing efficient initialization in multiple slave stations with multiple mask stations. In this case, conventionally, at a particular slave station,
In the case of a plurality of mask stations, methods have been used in which only a specific station among the plurality of mask stations is used for initialization control, or in which manual intervention is required.

Such a method lacks flexibility in system reconfiguration and has the disadvantage of inducing operational errors. Furthermore, when a slave station on the side to be initialized receives an initialization instruction message from a mask station that controls initialization, the slave station has already completed the initialization, and the initialization will be re-executed unnecessarily. Inefficient initialization was an unavoidable drawback.

OBJECTS OF THE INVENTION The present invention aims to solve the above-mentioned drawbacks and to realize an efficient initialization of constituent stations in a local area network.

[Key points of the invention]

The present invention is a local area network system in which a plurality of stations are connected to a common transmission path and messages are sent and received between the stations, and the stations are connected to an information processing device and a common transmission path of a local area network. and a local area net adapter that allows the station to send and receive messages to and from other stations;
1) means for transmitting initialization instruction message information to a connected information processing device when receiving an initialization instruction message from another station via a common transmission path; (2) a timer that operates upon reception of the initialization instruction message; (3) means for initializing the information processing device in accordance with the elapse of a specific time displayed by the timer means; and (4) means for stopping the initializing means from the information processing device to which it is connected. .

More specifically, the present invention provides a method for initializing when a local area net station comprising a local area net adapter and an information processing device equipped with the above-mentioned means operates as a slave station whose initialization is controlled within the system. Even if an initialization instruction message is received from the controlling host station, the local area network adapter is responsible for executing the initialization itself, but the information processing device has the right to stop the initialization. At the time of receiving notification from the local area network node adapter, the status of the information processing device is determined, and if the right to stop is exercised, the execution of initialization of the local area network adapter to the information processing device can be stopped. It is characterized by being configured as follows.

[Explanation based on examples]

Next, the present invention will be described with reference to embodiments shown in the accompanying drawings.

FIG. 3 is an enlarged internal block diagram of the embodiment of the present invention regarding station 1 constituting the local area network shown in FIG. The station 1 is a local area consisting of a loop interface device 10 connected to a loop-shaped common transmission path 2, and an adapter that connects the information processing device 20 and the loop interface device 10 both logically and physically. It is composed of a net adapter 100 and an information processing device 20. The loop interface device 10 and the adapter 30 constituting the local area net adapter 100 are connected by a pinto serial transmission line 3,
The adapter 30 is mounted inside the rack of the information processing device 20, and connection to the information processing word W20 is made through the internal lotus 4 of the information processing device 20. The transmission line 3 may be bit parallel.

Note that the loop interface device 10 and the adapter 30 within the local net adapter 100 do not have to be clearly separated.

FIG. 4 is an enlarged internal block configuration diagram showing the information processing device 20 in further detail. The information processing device 20 includes a central processing unit 40, a main storage device 50, an input/output processing device 60, and an internal bus 4 that connects them. Note that an adapter 30 constituting a local area net adapter 100 is connected to this internal bus 4. However, information processing device 2
There is no need to limit the configuration to just this one.

FIG. 5 is an enlarged block diagram showing in more detail the embodiment adapter 30 of the present invention that constitutes the local area network adapter 100. As shown in FIG.

In FIG. 5, a microprocessor 110 coupled to an information processing device 20 via an internal bus 4 inputs input to a transmission memory 112 via a transmission DMA control circuit 111, and the output of this transmission memory 112 is transmitted via a transmission control circuit 113. and input it to the parallel-to-serial conversion circuit 114. This parallel conversion circuit 114
The output is output to the transmission line 3 via the driver 115. The output control circuit 113 is coupled back to the microprocessor 110 via signal line 202.

The microprocessor 110 also inputs data to the reception memory 104 via the reception DMA control circuit 105.

The output of this reception memory 104 is input to the serial/parallel conversion circuit 102 via the reception control circuit 103. The output of this serial-to-parallel conversion circuit 102 is outputted to the transmission line 3 via the resin filter 101. The reception control circuit 103 is coupled to the microprocessor 110 via a signal line 201.

The operation in FIG. 5 will be described assuming that station IX at address X in FIG. 1 initializes the information processing device at station 1y at address Y.

First, station IX sends an initialization instruction message as shown in FIG. 6 as a frame to station 1y. Since the destination address of the frame is Y, the loop interface 10 in the local area network adapter of station 1y receives this frame.

In FIG. 3, the loop interface 10 transmits the received frame to the adapter 30 via the transmission line 3.

In Figure 5, loop interface 1 with transmission path 3
The frame sent from 0 is first signal-shaped by the receiver 101, then grouped into 8-bit units by the serial-to-parallel conversion circuit 102, and stored in the reception memory 104 under the control of the reception control circuit 103. Note that the reception control circuit 103 can operate independently of the microprocessor 110.

When the storage of the frame in the reception memory 104 is completed, the reception control circuit 103 interrupts via the signal line 201 to the microprocessor 'j-110. The microprocessor sensor 110 interrupted by the signal line 201 reads and checks the frame in the reception memory as shown in the flowchart of FIG. If the frame is an initialization instruction message, first, a timer built in the microprocessor sensor 110 specifies a specific time, that is, the information processing device 20 receives the initialization instruction message and sends it to the adapter 30 via the internal bus 4.
It receives the message, processes it, determines the time during which it can instruct the adapter 30 to stop the initialization via the lotus 4, and sends the reception of the initialization instruction message to the central processing unit 40 via the internal lotus 4.

After the microprocessor 110 notifies the reception of the initialization instruction message to the central processing unit 40 via the internal bus 4,
It waits for an initialization stop instruction from the central processing unit 40 and waits for the timer to time out. Note that the storage of the next received frame into the reception memory 104 is not performed unless there is an instruction from the microprocessor 9'110.

Even if the central processing unit 40 receives the initialization instruction message reception notification from the adapter 30 via the bus 4, it cannot process it unless its own initialization operation is completed, so the timer inevitably times out. Central processing unit 40
If the initialization operation has been completed, the initialization instruction message can be processed, and therefore an instruction to stop the initialization instruction is given before the timer in the microprocessor sensor 110 times out. Upon receiving the instruction, the microprocessor 110 immediately stops the built-in timer and stops the initialization operation. The signal line 20 sends an instruction to receive the next received frame to the reception control circuit 103.
Do it in 1.

After receiving the initialization stop instruction, the central processing unit 40 learns about the host station IX from the initialization instruction message shown in FIG. 6, and instructs the adapter 30 to send the initialization complete message shown in FIG. 7 to the host station IX. command. The microprocessor 110 of the adapter 30 stores the message shown in FIG. 7 as a frame in the transmission memory 112 according to the command. When a transmission start instruction is given to the transmission control circuit 113 through the signal line 202, the contents in the transmission memory 112 are sent to the transmission line 3 through the serial/parallel conversion circuit 114 and the driver 115. In FIG. 3, the frame sent from the adapter 30 via the transmission line 3 is sent to the common transmission line 2 via the loop ink face device 10. This frame contains X in the destination address field, so station I with address
Received by X. In this way, unnecessary reinitialization is not performed.

Further, when the timer built in the microprocessor 110 of the adapter 30 times out because the central processing unit 40 has not been initialized, the microprocessor 110
For example, the BHPOWN signal of internal bus 4 and BHTRA
The P signal is driven to clear all information processing devices 20 and change the central processing device 40 to an initialization start state.

The reception control circuit 103 then sends an indication that the next frame can be received.
This is done through the signal line 201. On the other hand, the central processing unit 40 in the star 1 to star status loads the operating program from the file device 70 into the main storage unit 50, transfers the execution sequence of the central processing unit 40 to the operating program, and completes initialization.

〔Effect of the invention〕

As described above, according to the present invention, when a station under initialization control is being initialized, even if an initialization instruction is received from another station, the station can operate without issuing unnecessary initialization instructions. There are advantages. When receiving start-up control from a plurality of other stations, adopting this initialization method has the effect that the initialization operation of the station receiving start-up control can be carried out smoothly and efficiently.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional loop topology local area network. Figure 2 is a circuit diagram of a conventional bus topology local area network. FIG. 3 is an enlarged internal block diagram of a station constituting a local area network of an apparatus according to an embodiment of the present invention. FIG. 4 is an enlarged internal block diagram of an information processing apparatus according to an embodiment of the present invention. FIG. 5 is a detailed enlarged block diagram of the adapter in the station of FIG. 3. FIG. 6 is a diagram showing a frame of an initialization instruction message. FIG. 7 is a diagram showing a frame of an initialization completion message. FIG. 8 is a flowchart of processing performed by the adapter according to the embodiment of the present invention according to the initialization message shown in FIG. DESCRIPTION OF SYMBOLS 1...Station constituting a local area network, 2...Common transmission line, 3...Transmission line, 4...Internal lotus, 10...Loop interface device, 20...
- Information processing device, 30... adapter, 40... central processing unit, 50... main storage device, 60... input/output processing device, 70... file device, 100... local area network Adapter, 101...Receiver, 10
2... Serial-to-parallel conversion circuit, 103... Receiving control circuit,
104... Reception memory, 105... Reception DMA control circuit, 110... Microprocessor, 111...
Transmission DMA transfer control circuit, 112... Transmission memory, 1
13... Sending control circuit, 114... Parallel-serial conversion circuit, 115... Driver. Patent Applicant NEC Corporation Agent Patent Attorney Nao Taka Ide M 2 Illustration 3 Figure 0 Figure 4 B Figure S Nail 7 Figure

Claims (1)

[Claims] (1) In a plurality of local area net stations that are connected to a common transmission path and mutually send and receive messages, the station has an information processing device that is connected to the common transmission path of the local area net and communicates with other stations. and a local area net adapter that enables transmission and reception of message messages, and the local area net adapter has information processing that connects the initialization instruction message information when it receives an initialization instruction message from another station via a common transmission path. means for transmitting data to the information processing apparatus; timer means for operating in response to reception of the initialization instruction message; means for initializing the connected information processing apparatus in response to an indication of the passage of a specific time by the timer means; and connecting the initializing means. What is claimed is: 1. A local area net station that can be remotely initialized, characterized in that it is equipped with a means for stopping from an information processing device.