JPH02163854A - Check system for transfer of message - Google Patents

Abstract

PURPOSE:To check the transfer of messages including an abnormality process system of the bus transfer by adding a bus test service board to a bus. CONSTITUTION:At packet retransmission, a bus test service board 6 produces no bus abnormality even though it detects the presence of a message transfer check packet to a master board 2 via bus service board 1. Therefore the board 2 received the message transfer check packet from the board 1 adds the data to a message transfer packet to show the normal packet reception. The transfer of messages are carried out to a board of a low bus priority degree from a board of a high bus priority degree. However, the transfer of messages are stopped in the case a message is transferred to a non-message transfer board 4 which supports no transfer of messages. Thus the transfer of messages is checked.

Description

Detailed Description of the Invention (Field of Application in M Industry) The present invention relates to a multiprocessor system consisting of a plurality of boards having a bus interface and a plurality of boards having no bus interface, which enable transmission and reception of message transfers. Concerning the function check method for message forwarding in .

In particular, a message transfer check method in a multi-grossing system that checks the reliability of the bus interface in a system that requires data transfer such as an execution program by message transfer from the master board to the slave board after power is turned on to the device. Regarding.

(Prior art) Conventionally, in checking message transfer in a multiprocessor system, a processor in a board that has a bus interface that enables message transfer controls the bus interface that transfers all messages, and loops back all messages. By doing this, Mayu maintains all the sending/receiving programs and transfer data in the board that sends and receives messages, and transfers messages between any two boards in the multiprocessor system.

There is a method in which a data transmission/reception test is performed to confirm that predetermined transfer data is correctly transmitted and received.

(Problems to be Solved by the Invention) However, in this method of checking transmission and reception of message transfer in a multiprocessor system, there is no check for nine checks via the system basketball. Functions that directly access the system bus may be unchecked, and bus failures during message transfer cannot be checked.Furthermore, in a peer-to-peer test between any two boards in a multiprocessor system, If you perform a sending/receiving test on all boards that have message functions, there are problems such as complicated processing and long processing times.Furthermore, it is necessary to determine whether there are any boards in the system that cannot forward messages. unable to
I can't even check that.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a message transfer check method in a multiprocessor system.

(Means for Solving the Problem) Ninthly, the message transfer check method according to the present invention achieves the above object, which includes a bus interface that enables message transfer via a system bus and a processor that controls the bus interface, In a multiprocessor system consisting of a plurality of first boards capable of message transfer and a plurality of second boards not capable of message transfer, fmRelXl
These boards include a master board that controls the bus interface and sends and receives messages, a slave board that controls the bus interface and sends and receives all messages, and a friend bus service board that has the function of monitoring and controlling the system bus and a bus timeout machine Xt. The bus service board also includes a next pass test service port which is fully prepared to test the messages transferred via the system bus. When transferring a message transfer check packet, the bus test service board causes all abnormalities to occur, checks the transfer of the message transfer check packet, returns all the results, and then sequentially checks the message transfer for boards with lower priority. The system is configured to perform the same check as above, and to monitor the message return timeout the next time the message transfer check bucket is sent to the second board which cannot transfer the message.

(Example) The present invention will be explained in more detail below with reference to one drawing.

FIG. 1 is a basic circuit diagram showing an embodiment of a message transfer check system according to the present invention.

After the power is turned on, a bus reset operation is performed on the bus service port 1. Bus service port 1.

During the reset operation period, for each board connected to the system bus 7, an ID indicating system bus arbitration authority is provided.
and an ID indicating all the boards on the system bus. However, this sending is not done by message transfer, but by other means. For example, it is directly set by a signal line for ID transmission. here.

The bus service board 1 has the highest arbitration priority in the system, and the bus test service board 6 has the lowest priority. Master board 2 and slave board 3.5
The arbitration right of the non-message transfer board 4 is higher than that of the bus test service board 6, and lower than that of the bus service board l. However, the master board 1 and slave board, which support all message transfers, are equipped with a processor 3.5, and the processor supports the program that supports sending and receiving messages, and when a bus transfer error occurs, the message is sent. It has programs that support retransmission, abnormality processing, etc.

Also, since the non-message transfer board 4 does not have a processor that supports message transfer, it does not have the above-mentioned program and does not have a message transfer function. However, the ID indicating all arbitration rights and the ID indicating the position of the board in the system have been received.

After the arbitration right is sent from the bus service board 1 to each board, the master board 2 transfers the message to the system bus 7.

Here, the format of the message to be transferred is not the message format normally sent out by bus transfer, but a fixed message packet with packet ID-1 of message transfer check.

FIG. 2 shows an example of a bus check message format used in the present invention. Figure 2 (altj: basic packet of message format; Figure 2 (bl) is an example of a message transfer check packet CD sent out first from bus service board 1; Figure 2 (c) shows the message transfer on master board 2. f'l of message transfer check packet indicating successful completion
J, Fig. 2 (dl is an example of a packet sent to a primary board after a message is transferred to a non-message transfer board, An example of a message transfer packet returned from the bus test service board 6 to the bus service board 1 in the example circuit configuration is shown.

Message transfer is checked by performing all message transfers sequentially from the master board with the highest priority 11' to the slave boards with the lowest priority. First, the master board 2 issues a command to execute a message transfer check to the bus service board 1 with the highest bus priority ff. Therefore, in the example shown in FIG. 1, a message is first transferred between the bus service board l and the master board 20.

Upon starting the message transfer check, the bus service board 1 transfers all the packets shown in FIG. 2(b) to the master board 2.
Send to. The master board 2 receives the next packet sent from the bus service board 1. At this time, when the bus test service board 6 detects that it is a message transfer check packet from the bus service board 1 to the master board 2, it intentionally generates a bus abnormality on the bus. This bus abnormality includes, for example, a parity abnormality in a data or address bus.

When a bus abnormality occurs, the bus service board 1 performs a message retransmission procedure and retransmits the packet to the master board 2. However, when retransmitting a packet, the bus test service board 6 does not generate a bus abnormality even if it detects that it is a message transfer check packet from the bus service board 1 to the master board 2.

Therefore, the master board 2, which has received the message transfer check bucket H from the bus service board 1, adds Yy' to all message transfer packets, indicating that the packet has been successfully received. In FIG. 2(C), a message indicating that the message transfer check received by the mask board 2 has been successfully completed is added and a friend packet H- is shown.

Subsequently, message transfer is similarly performed between master board 2 and slave board 3, and message transfer continues from the board with the higher bus priority to the board with the lower bus priority. The message transfer packet sent from the master board 2 to the slave board 3 is a packet obtained by adding the message transfer packet shown in FIG. 2 (cl) to the slave board.

Message transfer continues from a board with a high bus priority to a board with a low bus priority, but if a message transfer is performed to a non-message transfer board 4 that does not support message transfer, the message transfer stops here. . As a precaution, bus service board 1
The message transfer is completed within a certain period of time tK, and it is monitored to see if they are friends. With this function, a message transfer check packet is transmitted to the non-message transfer board 4, and the message transfer check is not aborted by the non-message transfer board 4.

Here, the 9th board sends a message forwarding check packet to the board that cannot forward messages.
If the bus monitoring function of the bus service port 1 determines that all K operations have been performed, the same message transfer operation is performed on the board that transmits the primary message transfer check packet. However, as shown in Figure 2 (dl), the packet sent here is appended with information indicating that a message transfer check packet is to be sent to a board that cannot send or receive message transfers.

Finally, data transfer is performed between the bus test service board 6 and the bus service port 1.

When the last message transfer check is completed, the bus service port 1 notifies the master board 2 of the completion of the check. The master board 2 judges the packet received by the bus service port 1 and confirms that there is no abnormality in the message transfer circuit system during message transfer.

With the above operations, master board 2 and slave board 30
It becomes possible to check the packet transfer (normal processing, abnormal processing) between the two.

(Effects of the Invention) As explained above, the message transfer check method according to the present invention provides a check fee for nine message transfers including the abnormality processing system in bus transfer by adding a bus test service board to the bus. It can be carried out.

Furthermore, messages are transferred sequentially between the next boards that have a message transfer function, so the master board transfers messages sequentially.
Place F! ! It is possible to diagnose the message transfer circuit thread within the system without any intervention.

Master board processing is reduced and the time and money required for one diagnosis @
can be reduced. Even if a board that cannot send/receive message transfer is connected to the bus, the mounting position of the non-message transfer board can be determined, and the message transfer function can be checked between boards other than that board.

Therefore, it is necessary to detect failures in the message transfer function using the system bus as an initial diagnostic process after turning on the IIL power of devices such as workstations, and it is necessary to execute the failure detection process in a short time. It is suitable for devices such as those in 75.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the message transfer check method according to the present invention, and FIG. 2 shows an example of the message format for bus checking used in the present invention. ) is an example of the basic packet of the message format, (b) is an example of the message transfer check packet sent first from the bus service port,
(Message transfer is normal on the 091 master board)
(d) is an example of a packet sent to the next board after all messages have been transferred to a non-message transfer board; (e) is an example of a message transfer check packet indicating that the message has been transferred. 1 and 2 show examples of message transfer packets returned to the bus service from the bus test service board that has the circuit configuration of the specific example shown in FIG. 1...Bus service port 2...Master board 3.5...Slave board 4...Non-message transfer board 6...Bus test service board 7...System bus

Claims (1)

[Claims] A plurality of first boards each having a bus interface capable of transmitting messages via a system bus and a processor controlling the bus interface, capable of transmitting messages, and a plurality of second boards not capable of transmitting messages. In a multiprocessor system consisting of a board, the first board is a master board that controls the bus interface and sends and receives messages, a slave board that controls the bus interface and sends and receives messages, and a system bus that monitors the system bus. and a bus test service board with a control function to test messages transferred via the system bus. A transfer check packet is sent to a board with a high priority, and when the message transfer check packet is transferred, an abnormality is generated in the bus test service board to check the transfer of the message transfer check packet and the result is returned, as follows. , the same check as the message transfer check is performed on boards of lower priority in order, and when a message transfer check packet is sent to a second board that cannot transfer the message, a timeout of message return is monitored. A message transfer check method for microprocessors.