JPS6015977B2 - Selective connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes a plurality of input/output channels and a series of input/output control units (hereinafter referred to as IOCs).

) group, in which a series of IOC groups connected in series to one input/output interface are connected to one of the input/output channels provided as a path to the main memory. This relates to a selective connection method for switching devices that selectively connects input/output channels by selecting routes, and is intended to perform dynamic automatic route switching at high speed with minimal addition of signals. be. Conventionally, when there are multiple input/output channels for an IOC group, it has been done manually as shown in FIG. In FIG. 1, 1 and 2 are input/output channels, MSW is a manual switch device, IOCI to IOC8 are input/output control devices, RTI is a route, and RT2 is a route 2. That is, the manual switching device MSW switches route RTI to channel 1 or route RT2 to channel 2.
It is manually operated to switch the connection to either route, and relays the transmission and reception of signals between the channel and the IOC. However, the route switching function of this type of switching device is difficult to switch to another route in the event of a channel failure and continue to enable data transfer between the main storage device and the input/output device. This method has the disadvantage that it takes a long time to switch the route, and the system failure of the data processing system during this time cannot be avoided.

The present invention adds new signal lines equal to the number of switching input/output channels to the conventional input/output interface, and when starting from the input/output channel, the switch device uses the newly added signal lines to initiate the start. The root of the input/output channel
Displayed on the OC, and when started from the IOC, the IOC uses conventional data lines to instruct the switching device to route the input/output channels to be connected, automatically switching the route and connecting. Moreover, it can be done quickly,
The purpose is to eliminate the above-mentioned drawbacks.

A further new objective is to improve the cost performance of the system by providing a switch device that adopts this method, making it possible to share input/output devices from a plurality of input/output channels.

Further, the present invention provides a plurality of input/output channels, one or more IOC groups consisting of one or more IOCs, and a switch device for making an initial connection between the plurality of input/output channels and the IOC group. , in an input/output control system in which the input/output channel and the switch device are connected by a higher interface including a data bus, and the switch device and the IOC group are connected by a lower interface including a data bus, the lower interface The present invention provides a means for selecting one of a plurality of input/output channels and switching connection by effectively utilizing the input data bus line of the input data bus.

Specifically, by providing multiple route display lines connected from the switch to the IOC on the lower interface, the switch device can display to the IOC which of the multiple input/output channels it is connected to. In addition, each of the input data buses of the lower interface is made to correspond to each of the plurality of input/output channels as a route flag, and the IOC indicates to the switch device which of the plurality of input/output channels the connection is requested. 9. Then, when a connection request is made from the input/output channel to the town C via the upper interface, the switching device raises the route display line corresponding to the input/output channel, and When a connection request is made to any one of the plurality of input/output channels from the input/output channel, the IOC places the route flag corresponding to the input/output channel on the input data bus, while the switching device places the input/output flag corresponding to the input/output channel on the input data bus. Select one of the output channels,
By raising the route display line corresponding to the selected channel, it is indicated that the input/output channel is connected via the upper interface.

Next, the present invention will be explained in detail using the drawings.

FIG. 2 shows an embodiment of the present invention, and in the figures, the same symbols as in FIG. 1 indicate the same things as in FIG. 1. In the figure, two sets of upper interfaces to which two input/output channels are connected to a switching device SWU, which relays and controls transmission and reception of signal lines between the input/output channels and the IOC, and an IOC1.
, IOC2 is provided with a set of lower interfaces connected to an ICC group consisting of two IOCs, but the number of upper interfaces, that is, the number of channels, can be up to 8, and the number of lower interfaces, that is, the IOC group. The number of can be arbitrary. The upper interface has a request acceptance line C-OUT from the input/output channel to the switch device SWU, which indicates that the channel has accepted a connection request from the IOC.
and the output data bus B- at startup from the input/output channel.
Address line A indicates that the input/output channel is sending an input/output device number (called a device address and is usually coded) to OUT, and selection indicates that a connection from the input/output channel is being instructed. The line S, a set instruction line RS for instructing the IOC to set IJ from the input/output channel, an output data bus B-OUT, and other signal lines not shown are connected. Furthermore, the upper interface has a connection request line C-IN indicating that the IOC requests connection to the input/output channel when activated from the IOC, and an input data bus line B-m from the switching device SWU toward the input/output channel. and other signal lines not shown are connected. Each IOC (IOCI and IOC2) is connected to the lower interface from the switch device 6WU.
), two route display lines Ri newly added in the present invention (i=1, 2...N, N correspond to the number of input/output channels connected to the switch device SWU, and are 2 or more and 8 or more) The following integers) and the same number of signal lines as the upper level interface are connected, and each IOC is connected to the switch device SWU.
The same number of signal lines are connected to the upper interface.

The embodiment of the present invention includes a set of IOCs IOC1 and IOC2.
It concerns the switching connection between the group and input/output channel 1, ie route 1, or input/output channel 2, ie route 2.

In general, an input/output device is activated by an input/output channel to perform input/output operations including data transfer, but this input/output operation must be performed between the activated input/output channel and the activated input/output channel. be.

Therefore, if there are multiple input/output channels for the IOC group and the above operations are relayed by the switch SWU,
When booting from an input/output channel, the switching device SWU informs the IOC which input/output channel the boot is from, and when booting from the IOC, the IOC informs which input/output channel the connection is requested. In response to this, the switching device SWU needs to display on the IOC which input/output channel it has connected to. Also, since an IJ set from an input/output channel needs to reset only the input/output devices connected to that input/output channel, the switch device SWU needs to display which input/output channel the set is from. .
The route display in the selective connection operation in the three cases described above will be explained in detail with reference to FIGS. 3 to 5.

3, 4, and 5 show the state of the signal waveform (logic rl'') generated on each line of the lower-order interface in FIG. 2 during the operation at the time of each selective connection. We will explain the route display operation, that is, the route display when starting from an input/output channel.When starting from an input/output channel, the selection line S in Fig. 2 is sent out, and the address number (input/output) is sent to the output data bus B-OUT. It starts by sending the address line A with the output device number), and each IOC checks the input/output device number and sends/receives commands or data with the IOC with the matching address number. When the switch device relays the activation from this input/output channel, the route display is made by connecting the address line and the route display line Rn (n is 1 or 2) and displays on the IOC connected to the lower interface which input/output channel of the upper interface the activation is from.Next, the second route display operation, that is, the activation from the IOC The route display at startup will be explained.

The activation from the IOC is an ICC with a connection request to the channel.
raises the connection request line C-IN, and in response, the input/output channel is started by raising the selection line S and the request acceptance line C-OUT. At this time, as shown in Figure 4,
When the IOC raises the connection request line C-IN, it sets the route flag to the input data bus B- of the lower interface.
IN' indicates which input/output channel requires connection. The switch device SWU checks the route flag sent by the IOC onto the input data bus line B-IN, raises the connection request line C-IN of the upper interface of the input/output channel for which connection is requested, and disconnects the input/output channel from the input/output channel. In response to the response from the request reception line C-OUT, it is decided which connection to make, and the request reception line C-OUT of the lower interface is
- By displaying which input/output channel is connected with the route display line Rn (n=1 or 2) corresponding to the input/output channel along with OUT, and relaying the selection line S, the route is routed. Finish the selection support. Finally, the route display at the time of reset, which is the third route display operation, will be explained. Resetting is performed by a reset instruction line RS sent from an input/output channel.

As shown in FIG. 5, when relaying the reset instruction, the switch device SWU instructs the IOC from which input/output channel the glue set comes from, by connecting the route display line Rn (n=1 or 2) corresponding to the input/output channel. ). Although it is clear from the above explanation that dynamic automatic route switching is possible, a specific example will be described.

IOCI in Figure 2 receives activation from input/output channel 1,
When IOC2 receives activation from input/output channel 2 and performs a data transfer operation, when a request for data transfer is generated, IOCI selectively connects to input/output channel 1 according to the procedure explained in FIG. The switch device SWU' requests the switch device SWU' to selectively connect to the input/output channel 1. When the predetermined data transfer is completed, the switching device SWU disconnects from the input/output channel 1, and then connects to the input/output channel 2 using the same procedure when a request to transfer data is issued to the IOC 2. In this way, the switching device can automatically selectively connect the IOC to either input/output channel 1 or input/output channel 2 as required. As explained above, the present invention enables high-speed dynamic selective connection operation by the switching device by newly providing signal lines equal to the number of switching input/output channels between the switching device and the IOC. It is possible to share IOCs from output channels, and the cost performance of the system can be improved.

[Brief explanation of drawings]

FIG. 1 shows an example of an input/output control system including a manual switch device. FIG. 2 is an embodiment of the present invention, and shows an input/output control system including newly provided signal lines according to the present invention. FIGS. 3 to 5 show time relationships of signal lines to explain the operation of essential parts of the selective connection system of the present invention. In the figure, 1 and 2 are input/output channels, SWU is a switch device, IOCI to IO
C8 is an input/output control device, RI and R2 to RN are route display lines, RTI and RT2 are upper interfaces, B-OU
T is an output data bus, and B-W is an input data bus. Chrysanthemum, Figure 2 Figure 3 Figure 4 Laughing Four

Claims (1)

[Scope of Claims] 1. A plurality of input/output channels, an input/output control device group consisting of one or more input/output control devices, a switch device that performs switching connection between the input/output channels and the input/output control device group, In an input/output control system comprising an upper interface including a data bus connecting an input/output channel and the switch device, and a lower interface including a data bus connecting the switch device and the input/output control device group, the lower A route display line is provided on the interface to indicate to which of the plurality of input/output channels the switch device is connected to the input/output control device group, corresponding to each of the plurality of input/output channels. A selective connection method characterized by the following. 2. When the switch device connects to any input/output control device among the plurality of input/output control device groups in response to a request from the plurality of input/output channels via the upper interface, the switch device Claim 1, wherein the input/output channel and the input/output control device group are connected via the upper level interface by raising the route display line corresponding to the channel. Selective connection method. 3. Each input data bus of the lower interface is associated with each of the input/output channels as a route flag, and when the input/output control device requests connection to any of the plurality of input/output channels, The input/output control device places a route flag corresponding to the input/output channel on the input data bus line of the lower interface, and the switch device raises the route display line of the corresponding input/output channel to control the input data bus of the upper interface. Claim 1 or 2, characterized in that the input/output channel and the input/output control device are connected via an ace.
Selective connection method described in section.