JPS59226933A - Communication controller - Google Patents

Abstract

PURPOSE:To switch quickly the communication controllers by producing the same state as an old communication controller within a new communication controller with a switching instruction given from a master processor. CONSTITUTION:A using communication controller 21 has a fault, and a switching instruction is delivered from a master processor 11. Then a new communication controller 22 reads an address A out of a system fixed address of the processor 11. The address A stores the head address of each control word table of processors 11-16. Then the controller 22 is started while a switching commands of communication lines are delivered to the processors 11-16 respectively. A reception line C2 for switching commands of communication lines is delivered from the processor 11. The same control information as the controller 21 is produced within the controller 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a control method for a communication control device that controls communication between a plurality of processors.

[Background of the invention]

A conventional communication control device is generally activated by a command from an individual processing device that is a communication request source, and first reads communication control information storage address information from a fixed address a of an attached storage device to the processing device. Stored in the communication control device.Next, read the address b of each processing device, e.g. Input communication control information such as data storage address and execute communication. Finally, the most significant bit of address b is changed to 0'' and the processing unit is notified of the end of communication.The next communication will be at address b+
Look in 2 and perform the same procedure as above.

Therefore, if the current communication control device becomes a failure and the communication control device is switched, each processing device must execute the above-mentioned communication activation command again in response to a command from the parent processing device that manages the system. I have to throw it.

In general, since there are many processing devices and many types of communication, this operation means a long communication outage, which not only has a negative impact on system performance, but also has a negative impact on system performance.
In conventional systems, logic is generally provided to determine whether or not to connect a communication path from a processing device to two communication control devices.
It has the function of preventing a failure in the processing device from spreading to other devices, and at the same time, preventing interference to the processing device from the single communication path that caused the failure.This logic is based on the processing device itself or It was controlled only by direct control from the parent processing unit. For this reason, the parent processing device is required to control the communication path logic of all the processing devices when switching the communication control device, and there is a problem that the program of the parent processing device becomes clumsy.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a switching system that allows communication control devices to be quickly switched in response to instructions from a parent processing device.

[Summary of the invention]

In the present invention, in order to easily switch the communication control device, the communication control device itself performs the following operations based on the switching command from the parent processing device.
In addition to switching the communication path control logic of each processing device,
All communication control information is retained in each processing device, and the first address of the communication control information stored in the address fixed between the processing device programs is stored in the new communication control device. We adopted the method of constructing a system in a similar state.

[Embodiments of the invention]

Hereinafter, specific embodiments of the present invention will be explained with reference to the drawings.

Figure 1 shows a block diagram of a system to which the present invention is applied.

In this example, six processing devices 11, 12 . ....

There are 16 and 2 communication control devices 21 and 22, and each processing device has a communication path with each of the two communication control devices 21 and 22.

Figure 2 shows the explanation [F] of the communication channel control logic - two communication channels 1. output gates 113 and 116 in
Input gates 114, 115'! a: Connected via '. 111, the switching circuit of the communication channel control flip-flop 112 interprets the input command from the communication channel S1 by setting the signal C1 to "1" and converts the flip-flop 0.7 to
2 is set, the input/output gates 113 and 114 are energized, and the communication path≠1 is connected to the processing device. The input/output gates 116 and 117 have a Q output of the flip-flop 112 of 1.
01, so it is closed. If the communication path≠2, the processing device and the communication path can be connected in the same way by setting the signal C2 to ``1'' and inputting a command. Further, signals A and B are used by the processing device itself to control the flip-flop 112.

Figure 6 shows the control words of the communication control device according to one embodiment of the present invention, and the address A indicates the first address of the storage address table of the control words of the information storage system A. ing.

At address B, there is bit information 011011 indicating that 4 types of communication out of 6 types supported by the communication control device will be used. The starting addresses of the control words for each communication are as follows.

stored in order.

The following are control words for receiving device designated communication among the communication functions possessed by the communication control device according to the present invention. From address D, the control word for receiving device range specification communication is sent, and from address E, the receiving side control word for first receiving device specification communication is sent from address D or ll-.
) stores the receiving side control word for the receiving device range specification communication.

Now, the regular communication of the system according to this embodiment has been explained by taking the receiving device designated communication as an example.0) Next, the switching operation of the communication control device will be explained.

(1) Activation of Communication Communication activation may be performed from the processing devices 11 to 16 as in the conventional case, or may be performed from the parent processing device 11, for example.

If the processing device 12 now activates the communication control device 21, the communication control device 21 reads address B from the system fixed address (address A given to the communication control device 21, fixed address), and then It accesses address B, learns the type of communication performed by the processing device 12, and stores it in the communication control device. Next, from the focus information '011011' of address B, find the control word start address of each communication type (address B') +
(Is the focus position f with 1'?) Find it by +1 and read the address C from B11, the address D from B+2, the address E from B+4, and the address F from B+5, and store them in the communication control device. to report the completion of one startup.

(2) Communication Communication is carried out by periodically reading in the control words of each communication type for each processing device. For example, in the case of receiving device specified communication, the C address of the processing device 12 is read, and the most significant bit indicating the transmission request is “1°”. In this example, the most significant bit is 11°, so aEN, The processing device 16) reads WCl, reads the first static line 01 of the transmission data from address C111, and starts communication.

In the processing device *16, a reception control word is stored in a location corresponding to address E of the processing device 12, and the most significant bit is IQI, indicating reception permission. The received data is stored at the address corresponding to address E1, and the most significant bit is 'O''→゛1
1, and the most significant bit of address C of the processing device 12 is changed from □ to ``0'' to indicate the end of communication.

Thereafter, the control words are sequentially looked in, and at address C, it is detected that the next lower focus of the highest order is 11, and the next address to be looked in is set to address C. This means that the control words are infinitely connected by T and C.

Now, the currently used communication control device becomes a failure, and a communication control device switching command is issued from the parent processing device 11. This new communication control device 22 is located at the system fixed address of the parent processing device 11 (the fixed address given to the communication control device 22).
Read address A, which is the address where the control word table start address of each of the processing devices 11 to 16 is stored, from , and operate in the same manner as the communication activation operation described above while issuing a command to switch the communication path to the processing devices 11 to 16. Do the following. The reception line C2 for the communication path switching command is the parent processing device 1.
It is issued from 1. It is clear that the same control information as that of the single communication system # device 21 is formed in the communication control device 22.

The communication control device 22 also indicates the end of the operation to the parent processing device 11.
The parent processing device 11 turns off the reception line C2 for the two communication channel switching command. The next access address of the control word for various communications has the most significant bit as 101 → 111 (transmission) 1 →
It can be automatically calculated based on the point of 10I (reception), and if this point is not available, the address shown in the control word table may be used as the next access address.

〔Effect of the invention〕

According to the present invention, the parent processing device does not have to specify communication path switching or request registration of communication control information to each processing device, and can easily switch communication control devices.

Furthermore, it is not necessary for each processing device to know about the switching of the communication control device, which simplifies the functional division of the system.

[Brief explanation of drawings]

Figure 1 is a block diagram of an embodiment of a system embodying the present invention. Figure 2 is an explanatory diagram of communication channel control logic. 31' FIG. 3 is an explanatory diagram of control words of the communication control device according to the embodiment of the present invention. 11... Parent processing device, 12... Processing device a-21...
Communication control device. Representative patent attorney Akio Takahashi. Talented, Ingenious, 2nd Talented, 3rd

Claims (1)

[Claims] The communication control device includes a plurality of processing devices and a redundant communication control device, each of which has a communication path with the plurality of processing devices, and one of the processing devices is connected to the active system of the communication control device. means for specifying a first address of a first address group of a control word string of a plurality of communication functions included in the music signal control device or a storage device for storing the first address, in the system as a parent processing device having the authority to give instructions; , a communication control device comprising means for detecting an unfinished control word from a control word string.