JPH02219155A - Bus connection processing system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a bus connection processing method when connecting an expansion bus to a basic bus via a bus monitoring device.

The purpose is to improve the usage efficiency of adapters connected to the expansion bus.

Each of the processors is provided with a connection control unit that controls the connection between the host system to which it belongs and the expansion bus,
The bus monitoring device is provided with a switching register for controlling the connection, and the connection control unit sets a connection request signal in the switching register in order to perform data transfer, and upon completion of the data transfer, The connection request signal is reset, and when the host system and the expansion bus are connected, the bus monitoring device sets a connecting signal corresponding to the connection in the switching register, and the connection request signal is When set, check whether the connection signal is set.

It is configured to perform a connection corresponding to the connection request signal if the connection raw signal is not set, and to issue a connection request interrupt to the host system corresponding to the connection raw signal if it is set. do.

[Industrial application field]

The present invention relates to a bus connection processing method, and more particularly to a bus connection processing method when an expansion bus is connected to a basic bus via a bus monitoring device.

In order to expand the system, an expansion bus having functions equivalent to the basic bus is connected to the basic bus via a bus monitoring device (system expansion device or bus expansion device). Furthermore, in this case, one expansion bus system (bus expansion system) is shared by a plurality of basic bus systems (host systems).

[Conventional technology]

FIG. 5 is an explanatory diagram of the prior art, showing a conventional system.

In FIG. 5, 1 is a bus monitoring device, 2 is a processor or central processing unit (CPU), 3 and 4 are adapters,
10 is an expansion bus, and 20 is a basic bus.

One host system consists of one processor 2, one basic bus 20 connected to this, and a plurality of adapters 3 connected to this. Here, the host systems on the left and right sides of FIG. 1 are referred to as A system and B system, respectively.

The bus expansion system includes one bus monitoring device l.

It consists of one expansion bus 10 connected to this and a plurality of adapters 4 connected to this. The expansion bus 10 has the same functions as the basic bus 20, and the adapter 4 of the bus expansion system uses DMA (Direct Memory A).
This is an adapter that has the following functions:

The bus monitoring device l has two basic buses 20, A system and B system.
Provided to connect with these between.

These and the expansion bus 10 are connected or disconnected.

The adapter 4 of the bus expansion system is an expansion bus 10.

A system and B system are connected via the bus monitoring device l and the basic bus 20.
The bus expansion system transfers data between the processor 2 of the system or the adapter 3 of the host system.
It is shared by two host systems, A system and B system, and expands each of the two host systems.

[Problem to be solved by the invention]

FIG. 6 is an explanatory diagram of problems in the prior art.

As shown in FIG. 2, it is assumed that system A is connected to a bus expansion system, that is, an expansion bus 10. In this state, between the A-system adapter 3 and the adapter 4, for example, the A-system first adapter 3 and the first adapter 4, the A-system second adapter 3 and the second adapter 4, data transfer is performed sequentially.

For the A system, at the time when all the data transfer to be performed between the A system and the adapter 4 has been completed, that is, at the time when the data transfer related to the basic bus 20 of the A system has been completed.

Release the expansion bus 10. That is, the bus monitoring device l is
The basic bus 20 and expansion bus 10 of the system are disconnected. In this way, connection/disconnection processing between the basic bus 20 and the expansion bus 10 is performed in units of data transfer.

For this reason, while the A system was connected to the expansion bus 1G, the B system could not perform data transfer with the adapter 4 even if it made a connection request.

That is, after acquiring the bus connection sequence, the B system connects the A
Data transfer with adapter 4 could not be performed until the system was disconnected.

This is the same even if the connection request from the B system is made at a time when data transfer is not being performed, as shown in Figure 1.

Therefore, there was a problem in that the adapter 4 on the expansion bus 10 was used inefficiently.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bus connection processing method that improves the usage efficiency of adapters connected to an expansion bus.

[Means to solve the problem]

FIG. 1 is a diagram illustrating the principle of the present invention and shows a system according to the present invention.

In FIG. 1, 1 is a bus monitoring device, 2 is a processor or central processing unit (CPU), 3 is a first adapter, 4 is a second adapter, and 10 is an expansion bus.

11 is a switching register, 20 is a basic bus, and 21 is a connection control section.

One host system consists of one processor 2, one basic bus 2o connected to this, and a plurality of first adapters 3 connected to this. Here, the host systems on the left and right sides of Figure 2 are referred to as system A and system B, respectively.

When referring to the A-system processor 2, it will be referred to as processor 2A (the same applies to the others).

The bus expansion system includes one bus monitoring device 1.

It consists of one expansion bus 10 connected to this and a plurality of second adapters 4 connected to this.

The expansion bus 10 has the same functions as the basic bus 20.

The second adapter 4 is a DMA (mouth 1rect Memo
ryAccess) function.

The bus monitoring device 1 is provided between and connected to the plurality of basic buses 20A and 20B, and connects or disconnects these and the expansion bus 10. The second adapter 4 includes an expansion bus 10, a bus monitoring device 1 and a basic bus 20A.
, 20B to and from the processors 2A, 2B or the first adapters 3A, 3B, therefore,
bus expansion system.

It is shared by multiple host systems.

Each processor 2A, 2B includes a connection control unit 21A that controls the connection between the host system to which it belongs and the expansion bus 10 or bus expansion system.

21B is provided. The connection control units 21A, 21B are provided on the respective processors 2A, 2B or the operating system (O3) of the host system.

The bus monitoring device l is provided with a switching register 11. The switching register 11 is used to control the connection between the basic bus 20 or host system and the expansion bus 10 or bus expansion system.

As shown in Fig. 1(B), the connection request signal is set (“1”).
The connection request bit is used to set a connection signal (set to "1'), and the connection request bit is used to set a connection signal (set to "1'). These bits are provided corresponding to each of a plurality of host systems.

(Function) The connection control units 21A and 21B monitor the host system to which they belong, and the connection control units 21A and 21B monitor the host system to which they belong (processor 2A,
2B or the first adapter 3A, 3B) sends a connection request signal requesting connection between the host system and the expansion bus 10 to the bus monitoring device 1. . That is, the connection control units 21A, 21
B sets a connection request signal in the switching register 11. In other words, each corresponding connection request bit is set to “1”.
shall be.

Further, when a connection corresponding to a connection request signal set by the connection control unit 21A and 21B is established and data transfer is performed, the connection control units 21A and 21B reset the connection request signal upon completion of the data transfer. That is.

The corresponding connection request bit is set to "0".

On the other hand, the bus monitoring device 1 is connected to the host system and the expansion bus 1.
0, and when the connection is made with any host system, the switching register 1
Set the connection signal corresponding to the connection to 1. In other words, the currently connected bit corresponding to the host system related to the connection is set to "1".

Further, when the connection request signal (of the same system) corresponding to the set connection raw signal is reset, the bus monitoring device 1 resets the connection raw signal and disconnects the corresponding connection.

Now, when the connection request signal is set by the connection control section 21, the bus monitoring device 1 checks whether or not the connection raw signal is set.

If the connection raw signal is not set, the bus monitoring device 1 performs the connection corresponding to the connection request signal. Therefore, the connection is established immediately after the connection request. This is possible by disconnecting the connection in response to the reset of the connection request signal, that is, by connecting/disconnecting the basic bus 20 and the expansion bus 10 in units of (data transfer for) one adapter 4. It is said that

When the connection raw signal is set, the bus monitoring device l issues a connection request interrupt to the host system corresponding to the connection raw signal. Knowing that there is a connection request from the host system, the expansion bus 10 is released early. That is, when the data transfer sequence for one adapter 4 that is currently being completed is completed, a disconnection instruction signal is sent. In response to this, the bus monitoring device 1.

The connection up to that point is disconnected, and a connection corresponding to the connection request is made. Therefore, the connection is established early after the connection request.

As described above, the adapter 4 of the expansion bus 10 is not occupied by one host system for a long time, and the connection request is quickly made, so that the usage efficiency of the adapter 4 can be improved.

〔Example〕

FIG. 2 is a configuration diagram of an embodiment, showing the configuration of the bus monitoring device 1. In FIG.

In FIG. 2, 12 is an interrupt section, 13 is a bus switching section, 14 is a time monitoring section, and 15 is a bus interface.

The interrupt unit 12 provides the connection control units 21A and 21B with the following information:
The other system connection request interrupt that performs the other system connection request interrupt or the connection interrupt is the connection from the connection control unit 21 of another system to the connection control unit 21 of the system (host system) currently connected to the expansion bus 10. This is done to notify you when a request is made. For this purpose, the bus monitoring device 1 or the interrupt section 12
monitors the connection request bit of the switching register 11, and refers to the currently connected bit when any of the bits is newly set. Connection interrupt 5 is performed when the expansion bus 10 is newly connected to a certain system, in order to notify the system. For this purpose, the bus monitoring device 1 or the interrupt unit 12 monitors the connected bit.

The bus switching unit 13 connects or disconnects the expansion bus 1G and the basic bus 2OA or 20B, that is, the A system or the B system.
When there was a disconnection instruction from 1.

The connection to the system of the connection control unit 21 (the system currently connected to the expansion bus 10) is disconnected. Also.

When the connection request signal from the system currently connected to the expansion bus 10 is reset, the connection is disconnected.

For this purpose, the connection request bit of the switching register 11 is monitored. On the other hand, when a connection request is made in a neutral state in which none of the systems are connected to the expansion bus 10, the system that made the request is connected to the expansion bus 10. For this purpose, the connection request bit is monitored, and the currently connected bit is referenced when the connection request signal is newly set. The neutral state is caused by a disconnection instruction or a reset of a connection request signal. Furthermore, if a new connection is not established even after a predetermined period of time has elapsed after the disconnection is performed in response to the disconnection instruction, the connection that was disconnected in response to the disconnection instruction is reestablished.

When there is a disconnection based on a disconnection instruction, the time monitoring unit 14 counts the time since the disconnection, and notifies the bus switching unit 13 of this fact when a predetermined time has elapsed. Note that, for example, if a new system is connected after the disconnection, the counting is stopped.

The bus interface 15 is connected to the biased portion 21A.

It transmits and receives various signals to and from 21B.

FIG. 3 shows the bus connection processing flow according to the present invention, and the fourth
The figure shows the state of the switching register during this process.

(2) The B-system connection control section 1 21B sends a connection request signal to the bus monitoring device 1.

Prior to this, bus monitoring equipment! is A system and expansion bus 10
When the switching register 11 is connected, as shown in FIG. 4(A), both the connecting bit and the connection request bit of the A system are set to "1".

Then, by setting the connection request signal, the switching register 11 becomes as shown in FIG. 4(B).

■ In response to the setting of the connection request signal, the bus monitoring device l refers to the thread A connection bit in the switching register 11 to determine whether a system other than group B (other system), that is, system A is connected. Check it out.

■ If the result of the above reference is that the system is connected to another system.

The interrupt unit 12 is connected to the connection control unit 2 of the other system, that is, the A system.
Interrupts connection request for other system to 1A.

■ The A-system connection control unit 2LA receives the interrupt.

It is checked whether the connection between the A system, which is the post system (self system) to which the self belongs, and the expansion bus 10 can be disconnected.

Then, at the time when it is determined that it is okay to disconnect, that is, at the time when the data transfer sequence that was being performed at the time when the interrupt was received is completed, a connection disconnection instruction signal for the A system is sent to the bus monitoring device 1.

In both cases, the A yarn connection request signal is reset and the 4 switching register 11 is set as shown in FIG. 4(C).

■ Upon receiving the disconnection instruction, the bus switching unit 13 of the bus monitoring device 1 disconnects the connection between the A system and the expansion bus 10, and the bus monitoring device 1 resets the A thread connection signal and transfers the connection to the switching register 11. as shown in Fig. 4(D).

(2) The bus switching unit 13 of the bus monitoring device 1 becomes neutral when all systems are disconnected.

If the B-system connection request signal is still being sent.

A connection is made between the B system and the expansion bus 10.

At the same time, the bus monitoring device 1 operates as shown in FIG. 4(E).
A B yarn connecting signal is set in the switching register 11.

Note that if it is determined in process (2) that the system is not connected to another system, processes (2) to (2) are omitted and process (2) is performed.

Furthermore, if the connection request signal for system B is not sent when the state becomes neutral, after a predetermined period of time has elapsed, the expansion bus 10 is reconnected to the system that previously generated the disconnection instruction signal, that is, system A. , issues a connection interrupt to the A system.

(2) The printing unit 12 issues a connection interrupt to the B-system connection control unit 21B in response to the setting of the B-thread connecting signal.

- In response to the interrupt, the B system accesses the bus expansion system (adapter 4) and transfers data.

■ When the data transfer is completed, the B-system connection control unit 2
1B resets the connection request signal of the B system as shown in FIG. 4(F).

[Phase] The bus monitoring device l responds to the reset.

Reset the B-system connected bit and connect the B-system and expansion bus 10.
Disconnect from. This results in a neutral state.

(Effects of the Invention) As described above, according to the present invention, in the bus connection process, connection/disconnection between the basic bus and the expansion bus is performed for each adapter of the expansion bus.

Since the adapter can be prevented from being occupied by one host system for a long time, the adapter can be used efficiently.

The efficiency of the entire system can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of the present invention. FIG. 2 is a configuration diagram of an embodiment. Figure 3 is the bus connection processing flow FIG. 4 is a diagram showing the state of the switching register. FIG. 5 is an explanatory diagram of the prior art. FIG. 6 is a diagram illustrating problems in the prior art. l is a bus monitoring device. 2 is the processor or central processing (A) Processing device (CPU). 3 is the first adapter. 4 is number 4 2 adapter. is an expansion bus. is the switching level. Jista. is basically a bus. is the connection control section. Ru.

Claims (1)

[Scope of Claims] A plurality of host systems each consisting of a processor (2), a basic bus (20) and a first adapter (3) include a bus monitoring device (1), an expansion bus (10) and a second adapter. In a system that shares a bus expansion system consisting of an adapter (4), each of the processors (2) includes a connection control unit that controls the connection between the host system to which it belongs and the expansion bus (10). (21), and the bus monitoring device (1) is provided with a switching register (1) for controlling the connection.
1), and the connection control unit (21) sends a connection request signal to the switching register (11) in order to transfer data between the host system to which it belongs and the second adapter (4). At the same time, upon completion of the data transfer, the connection request signal is reset, and the bus monitoring device (1
) monitors the connection between the host system and the expansion bus (10), and when the connection is established, sets a connection signal corresponding to the connection in the switching register (11), and also issues the connection request. When the signal is set, check whether or not the connection signal is set, and if the connection signal is not set, perform the connection corresponding to the connection request signal, and if it is set, perform the connection corresponding to the connection request signal. A bus connection processing method characterized by issuing a connection request interrupt to a host system corresponding to a connection signal.