JPS58169276A - Multiple computer system - Google Patents

Abstract

PURPOSE:To reset a corresponding input/output device by mutiple address transfer, by allowing each station to judge the transmitting origin of information on a loop bus and reset the input/output device. CONSTITUTION:Frames received from a loop bus 7 are stored successively in a shift register 11 and the address DA of the receiving station in inputted to comparators 14 and 15. The comparators make comparison with the addresses of registers 12 and 13 and when coincidence with one of them is obtained, the output of an OR circuit 16 is inputted to a station control part 17 to start the reception of the frames. When a command C is checked firstly to judge that it is a serial number initializing command, the station serial number table 20 in a control memory 18 is serched for an address corresponding to the address SA of the transmitting station in a frame among the received frames, thereby resetting its contents. Then, an occupying station address table is searched and when its number coincides with the AS, the corresponding input/output device is reset.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic computer system, and particularly to a multi-computer system in which data is transferred by an input/output bus shared by a plurality of X machines.

In a computer system using a loop-shaped input/output bus, the same signal passes through all the input/output devices, so the same information can be transferred to all the input/output devices at once. This is so-called broadcast transfer. However, there is a computer system in which a plurality of computers are added to a loop bus in parallel, and a plurality of input/output devices are added in parallel to share the loop bus. however,
Linkage with the loop bus will eventually be done through the station. At this time, the correspondence between the computer and the input/output device is arbitrary, and they enter into a specific correspondence relationship with each other according to instructions from the computer. Therefore, when a specific computer and a specific input/output device are in a corresponding relationship, that is, when that specific input/output device is occupied by a specific total of 3N machines, a message is sent from another computer. When a transfer instruction is issued, the broadcast transfer information is also transferred to the occupied input/output device.

The occupied input/output device is unrelated to the computer that performed the above-mentioned broadcast transfer, and cannot be used as a target for broadcast transfer. Therefore, broadcast transfer cannot be directly adopted in computer systems such as those described above.

An example of the contents of a command for broadcast transfer. A command that resets all input/output devices occupied by ICs and computers, and maintains the status of other occupied input/output devices without resetting them. There is a specific input/output device reset method. When resetting this specific input/output device, if the circular transfer cannot be used as described above, a method is adopted in which a reset command is transferred to each input/output device individually. However, the overall processing time is reduced due to the fact that the transfer of the reset command has to be repeated, and that each input/output device needs to take in and determine the reset command, and perform reset processing on the receiving side. It has a drawback that increases as the number of input/output devices increases.

An object of the present invention is to provide a multi-computer system in which it is possible to reset corresponding input/output devices by broadcast transfer.

The gist of the present invention is to extend the function of determining the source of information on the loop node to each station and determining whether or not to process this information effectively. It is at dead center after performing a reset.

The details will be explained below. In the present invention, an occupancy computer table for displaying occupancy computers is provided at least at a station on the side of a person or an output device. The configuration is such that the upstream computer can send the reset command by circular transfer.

The station on each input/output device side detects the broadcast transfer and
When the above table is searched, a check is made as to whether the upstream computer is a computer that has occupied its own input/output device. If it is a reset command from a self-occupied computer, the contents of the table are reset, and the input/output device linked to the station is reset. Unless it is a set command from a self-occupied computer, the tt passes and the set operation is not performed.

Furthermore, the present invention is also applied to efficient combinations with error control methods. The details will be explained below.

Information on the loop bus is generally transferred on the loop bus in a predetermined frame format, and an entertainment control scheme is used to increase the reliability of the information. for example,
The station that receives the frame checks the frame for errors, and if it is correct, it returns response information that reflects its own status to the source, and if it is incorrect, it treats the received frame as invalid. Processing is being carried out. On the other hand, the transmitting station detects that no response is received within a certain period of time, and retransmits the same frame a certain number of times.
A return method is used. Here, in order to prevent the retransmission frame from being received twice, each frame is given a - page number. This is managed individually between any two stations on the loop bus. Therefore, when a station starts up (e.g., powers up), all stages in the loop bus (the stations that have the possibility to transfer information with that station) communicate with that station. It is necessary to initialize the frame-page number between. Since the object of the present invention is a computer system, we focused on the fact that information 1.1 is transferred only between a certain computer and a certain input/output device. It is sufficient that the stations to which input/output devices are connected have as many frame-page number management tables as the number of connected stations, and the stations to which input/output devices are connected have as many frame-page number management tables as the number of stations to which computers are connected. Moreover,
Since the source of the transfer start is always the computer side, these page numbers are initialized by instructions from the computer.

In the present invention, initialization of the 7-frame serial number is performed by circular transfer, all stations connected to input/output devices receive this frame at the same time, and a frame-page number management table corresponding to the frame transmission source is created. Initialize. After such initialization, the station connecting the computer to which the station connecting the input/output device is occupied is stored in the previously mentioned occupied computer table, and if the source of the frame matches these nine, then , it also has the function of resetting input/output devices.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system configuration diagram to which the present invention is applied. C
PI71.2,3. and l104.5.6 are connected to loop bus 7 via station 8. The station 8Fi has a function of transmitting information to the loop bus 7 and transmitting received information to the CPU or l10K connected to the station 8. On the other hand, information exchange on the loop bus 7 is generally sent as a series of information called an Fi frame. Figure 2 shows an example of a frame, such as high-level data transmission control (HDL).
It is based on C). 8A is the source station address of the frame, C is the command, DA is the receiving station address, Gφ is the I10 control management information, DC is the frame length (for example, number of bytes), Fe2
is a frame entertainment check code, and F is a synchronization code indicating the start and end of the frame.

FIG. 3 shows a configuration diagram of a station 8 to which input/output devices are connected, which is an embodiment of the present invention. FIG. 4 shows the processing flow of the stage 9 control unit 17, and FIG.

FIG. 6 shows the contents of table 20.19. Station 8 includes a receiver 9 . for receiving signals on loop bus 7 . A transmitter 10 for sending out to the loop bus 7; a shift register 11 for storing serial information from the roof hash; Self-station address register 12, common (global) address register 13゜Comparator 14 for detecting address coincidence
,15. OR circuit 16 which takes the sum of the comparator outputs. A station control unit 17 that controls the reception of frames to its own station and the reception and transfer of data to and from input/output devices; an occupied station address table 19 corresponding to the aforementioned occupied computer table; and an occupied station address table 19 that corresponds to stations to which computers are connected. The control memory 18 has a frame-page number management table 2o.

Frames received from the loop bus 7 via the receiver 9 are sequentially stored in the shift register 11, and first, the frame leading ODA is input to the ratio converters 14 and 15. The comparator compares the own station address in the register 12 or the global address in the register 13, and if either one is negative, the output of the OR circuit 16 is input to the station control unit 174C, and the frame FL reception operation is executed. Start. It is assumed that the station control section 17 is composed of a microprocessor. A flowchart of the frame FL receiving operation at this time is shown in FIG.

First, a frame is received and a check is made to see if there is a frame-page number initialization command in the command C. When performing data transfer with a normal input/output device, it is determined that the command is not the above-mentioned initialization command, and the rationality of various frames is checked.

At this time, a unique stage address is designated as DA. The above rationality check involves comparing the frame-page number in command C with the content corresponding to SA in the frame-page number management table 20 stored in the control memory 18,
Or occupied station address table 19 and 8A
This means checking the ratio f, etc. Here, the frame-page number management table 20 is shown in FIG. 5, and addresses 1゜2, .
Indicates the station number of the station and its contents 5R
-i indicates the frame-page number. This frame-Tei 1
The i number SR= is a number held on a one-to-one basis by the transmitting station and the receiving station, and the transmitting station adds it to the frame and increments it by 1 upon normal completion. The receiving station checks the match during reception and increments +1 if the reception is completed normally. In FIG. 5, it is shown that a unique consistent number is given and updated for each transmitting station on each computer side.6 The station number as an address in FIG. 5 is given by the transmitting station number 8A, and The receiving station that received the station number 8A searches the table 20, prints out the contents of the corresponding address (SA compatible), checks whether it matches the sent frame-page number, and if it matches, the reception is normal. It is determined that it is, and it is +1.

This ends the rationality check on the page number.

If everything is normal as a result of the rationality check, data transfer with the corresponding input/output device of the station is performed.

The above is a case of executing data transfer with a normal input/output device. Next, the transfer of one initialization frame and its processing will be explained.

When a certain computer starts up and runs and resets (initializes) the input/output devices related to the Wrinkle computer, the corresponding contents of the frame-page number management table are also reset, and the frame at that time is Frame - Page number initialization frame. A global address is set in the DA in the frame and sent. All stations receive this frame using the same procedure as described above. After receiving the signal, the station control unit 17 performs processing according to chart 70 in FIG.

First, command C is checked to see if it is a frame-page number initialization command. In the present example, it is determined that it is an initialization command. Next, search the 7-frame receipt number management table 20, search for the SA-compatible address in the received frame, and reset (initialize) the contents.
do. Therefore, if any consistent number is set as the consistent number, it will be reset to ``0''.Next, the occupied station address table 19 is searched and the number of the occupied computer (in terms of stage 1 number, the sending It is checked whether station tlitsA) and 8A in the received frame match. If they match, it can be seen that the corresponding input/output device of the receiving station is occupied by the computer that sent the initialization frame. In FIG. 6, the table 19 can be formed by one register, and the code C11lt indicates either Reserve (occupied) R8V or Free (FREE), and 8Al indicates the occupied station number. When 8A and SAI match, R8VHF'REEK, SAs#: is reset (initialized) to t"0". After this initialization, the station performs a reset of the corresponding (linkage) input/output device. For stations that do not match, the contents of the occupied station address table 19 are not reset.
In addition, the input/output devices to be linked are not reset and the current state is maintained as is.

According to this embodiment, when initializing the frame-page number using broadcast transfer, it is possible to simultaneously perform a comparison with the occupied station address table and reset the input/output device. In the system,
The overhead of startup processing for individual computers can be greatly reduced. On the other hand, this frame can be sent several times from the computer side, but in this case,
Even if the station that executed the reset receives the same frame next time, the occupied station address table has been initialized, so there is no need to perform the reset process again, and the processing load on the station control unit (microprogram processing load) is reduced. can be made minimal.

! FIG. E7H shows the configuration of the station control section 17, which is constructed using DK and nodeware instead of a microprocessor. This station control section 17 includes buffer registers 30. Decoder 31. Continuous writing circuit 32 for table 20. It consists of a write successive circuit 332 and a rationality check circuit 34 for the table 19. In addition, there is hardware for data transfer between the input/output device and the computer, but rounding, which is not directly related, is omitted.

Buffer 30 temporarily stores frame PL. The decoder 31 takes in the frame PL and the 0R1il path 16
16 outputs, predetermined decoding of the frame PL (this also includes comparison of whether or not SA matches), and various necessary timings. When decoding the initialization command of the decoder 31, the write gun output circuit 32 reads the corresponding 8 of the table 20.
Initialize A's consistent number. At other times, necessary write/read instructions are given to the table 20, and processes such as page number updates are performed. The read/write circuit 33 resets the table 20 when the number of people in the table 1908 matches after the initialization of the table 20 is completed. Refreshingly, the successive write circuit 33 performs this on the cella table 19 of the occupied station when the command is not an initialization command. Furthermore, after the above series of initialization operations are completed, the decoder 31 issues a heliset command to the input/output device (Ilo) to be linked, and resets it. The rationality check circuit 34 sequentially loads the frame data in the buffer 73G when there is no initialization command, and performs a necessary compatibility check. Part of the rationality checking is also done by the read/write circuits 32-33. This is a check regarding 81, such as confirmation of a match of 8A. As a result of the check, if it is reasonable, data is transferred to and from the input/output device.

Each of the above embodiments is based on a frame-page number initialization command, but in addition to this initialization command, the table 19 can be initialized by an occupied stage initialization command. The table 20 may be initialized by other commands, or even in a system that does not have a table 20, initialization by an occupied station initialization command is preferable. Furthermore, this embodiment can be applied to an open bus instead of a loop bus.

According to the present invention #4, it is possible to initialize (reset) input/output devices occupied by a computer by broadcast transfer.

[Brief explanation of drawings]

Fig. fIs1 is a diagram showing the computer system of the present invention, Fig. 2 is a frame configuration diagram, Fig. 3 is a diagram of an embodiment of the station of the present invention, Fig. 4 is a flowchart of the station control section, Figs. The figure is a block diagram of the table, and Figure 7 is a diagram of another embodiment of the station control section. 1.2.3...CPU, 4,5.6...I/O device, 8...Station, 17...Station control unit, 18...Control memory. Agent Patent Attorney Masami Akimoto

Claims (1)

[Claims] 1. A common bus, a plurality of computers, a plurality of input/output devices, and correspondence to each computer and each input/output device that link the plurality of computers, the plurality of input/output devices, and the common bus. The station corresponding to the input/output device has an occupation state memory that stores the computer number (or the station number corresponding to the computer) occupying the input/output device, and the initialization command from the computer is When a broadcast transfer is sent via a common path, the station corresponding to each input/output device decodes the same @ transfer, and the computer that sent the broadcast transfer displays it as being occupied in its own occupancy state memory. A multi-computer system configured to check whether the memory is occupied, reset the display of the occupied state memory when it is occupied, and initialize the input/output device corresponding to the stage 1. . 2 A common bus, a plurality of computers, a plurality of input/output devices, and a station corresponding to each computer and each input/output device that link the plurality of computers and the plurality of input/output devices with the common bus, and The station corresponding to the output device has a nine-frame purchase number table memory corresponding to the station corresponding to the computer, and an occupation state memory for storing the computer number (or station number corresponding to the computer) occupying the input/output device. , a frame-page number initialization command from the computer is sent by broadcast transfer via the above-mentioned common bus, and at the time of death, the station corresponding to each input/output device decodes the broadcast transfer and identifies the sender of the broadcast transfer. When the computer is registered in its own frame-page number table, the frame-page number corresponding to the sender computer is initialized, and the sender computer is displayed as occupied in its own occupancy state memory, A multi-computer system configured to check whether a station is occupied, reset the display of the occupied state memory when the station is occupied, and initialize the input/output device corresponding to the station. & The multi-computer system according to claim 1g2, wherein the common bus is a loop path. 4. In addition to decoding circular transfers, the station compatible with the input/output device has the function of decoding transfers addressed to its own station alone, and when decoding frame-page number initialization command transfers addressed only to its own station, When the computer that sends out the transfer is registered in its own frame-page number table, the frame-page number corresponding to the computer that sends the transfer is initialized, and the computer that sends the transfer is occupied in its own occupied state memory. The scope of claims is such that the system checks whether the Mukuro Station is displayed as ``Mukuro Station'', and when it is occupied, resets the display of the occupied state memory, and initializes the input/output device corresponding to the Mukuro station. Multi-computer system described in Section 2 JJI or Section 3