DE2000930A1 - Data processing system - Google Patents

Description

IBM Germany Internationale Büro-Maiehinen Gmlltthaft mbH

Applicant:

Official File number:

Applicant's file number;

S§b71 £ ngen, January 8, 1970 lw-go

International Business Machines Corporation, Armonk, N.Y. 10504

New registration

Docket PO 968OI3 / 969OOI

Data processing option

The invention relates to a data processing system with one or more input / output channels and one or more Input / output control units.

In such systems, information should be transmitted to and from the channels. For this it is necessary to first select the channel which should be served. If there are several units opposite the channels on the other side, this is also below them Select units that should be connected to a channel. The transmitted information can consist of data, Commands as well as control signals. In such systems there are facilities for selecting the connected Units and channels as well as to differentiate the type of

009831/1511

carried information is necessary. In data processing systems with extremely high processing speeds, these devices do not work satisfactorily. Often there was rapid availability of the channels or of the units that come into contact with the channels. Also let the reliability of this Facilities much to be desired. Relays or transistors have hitherto been used in the known connection units. Devices with relays work too slowly and even when using transistors, the signal propagation time has so far been affected delays caused in the transistors.

From US Pat. No. 3,336,582 one device is as above described type known. In this facility, a first unit (e.g. a central data processing unit) is combined with several second units (e.g. input-output devices) optionally connected. For this purpose, there are three in the said facility Line bundle provided over the first line bundle Transferring data, addresses of input / output devices and commands, Signals are transmitted over the second trunk group which indicate the type of information in the first trunk group. Selection control signals are transmitted over the third trunk group, which control the flow of information and convey priority information. It is clear that such devices with multiple trunk groups for the connection of a plurality of first devices are no longer usable with a large number of second devices.

A matrix-like switching device is known from German Auslegeschrift 1,118,506. Using an electronic Crossbar, multiple storage devices are connected to 'multiple processing units. Each processing unit a special memory device (TM Fig. 3) is assigned, which the address of the associated with this processing unit Partial memory stores in order to avoid multiple allocations.

Docket PO 9680I3 / 969O

^ 09831/1611

This type of storage of the Bel'e'gi state of the switching matrix is complex and requires additional steps in the program control of the data processing system.

The invention is therefore based on the object of a reliable, modular device for selectively connecting one or several units of a first group with one or more units of a second group to create which is an optimal Possibility of using the suspended units guaranteed.

The invention is characterized by a matrix switching unit with a first sub-unit for connecting the channels to the or the control units and a second sub-unit for storing the occupancy status of the matrix connection points in the first subunit, and switching control units assigned by the channels, which are controlled by the channels and by the input / output control units Receive request signals, query the second sub-unit and evaluate received status signals, as well as signals for switching through or interrupting the connection points in the first sub-unit.

The device according to the invention has a low susceptibility to failure because the switching controls are decentralized. If a lower part fails, the whole system can continue to function. The ability to switch several connection paths through at the same time results in a high level of use of those on hold Units won. Furthermore, the modular structure of the device according to the invention results in the possibility of the number of the connected units can be easily changed.

** Docket PO 968cl3 / 969CO1

Another particularly advantageous embodiment of the invention is characterized in that transistors in the matrix connection points can be used, which are triggered by the switch-through signal at the The basis is driven into saturation and kept in saturation during the signal passage and that is achieved by the signal span inputs from the channel and from the input / output control unit will.

Thus, since a supply of the transistors can be omitted in the matrix switching unit itself, there is the advantage of being able to build the matrix switching unit small. A special cooling of the matrix switching unit can also be dispensed with. The type of control of the transistors results in a small signal delay and largely constant impedance ratios can be achieved.

Another advantageous embodiment of the invention is characterized in that that the transistor driver stage has a non-switched transistor at the base with a signal from one of the Polarity of the switching signal controls opposite polarity.

Through this measure, the crosstalk between the individual Connection routes are largely reduced.

According to a further, particularly advantageous embodiment iet a set-up control unit is provided to specify the structure of _n Möglichkeite with an instruction register and decoder to receive commands from the associated channel, which commands from the Schaltsteu-

Docket PO 968013 / 969OOI

009831/1511

can be taken into account when connecting the connection points and when sending out response signals.

The bodywork control unit receives and decodes commands from the assigned channel and can thereby pass on signals to the switch control which indicate to the switch control which connection points the switch control can switch through. Is an interface device, such as one associated with a plurality of connection points, as can be achieved in this way that a certain ä ter connection point is connected exclusively to a particular channel, so that a control unit of the interface device only works with this channel. No restrictions can be provided for the other connection points connected to the interface device. Another setup command E ^ Kte. provide that an interface device works together with several channels, provided that no connection point of this interface device is connected exclusively to one channel. Further setup commands can cause the existing connections to be resolved or temporarily block the control of certain connection points. The body control unit thus represents a higher-level device with other words, which connections are allowed. ™

Another advantageous embodiment of the invention is used for dynamic Multiple connection between channels and input / output control units and is characterized in that over the switch control unit sends request signals and other control signals from the channels to the input / output control units and response signals from the input / output control units

Docket PO 968013/969001

009831/1511

are supplied and that facilities for monitoring the Input / output control units are provided which respond to response «request signals from these control units and these Response signals and control signals to the relevant facility corresponding channel.

This means that each channel can handle any service request from a control unit regardless of which channel originally started that particular input / output operation.

Docket PO 968OI3 / 969OOI

009831/1511

The invention is shown below with reference to one in the figures Embodiment explained in more detail. Show it:

Figure 1 is a block diagram of the system in which the invention is included,

FIG. 2 is a block diagram of the switching controller 12 of FIG. 1,

Fig. 3 is a block diagram of the body control unit 14 of Figs. 1 and 2,

Fig. Ί a schematic view of the crossover switch, which is used in the switching matrix 10 of Figs. 1 and 2,

5 shows a diagram of the base charge distribution of the transistor of Fig. 4,

6 schematically shows a driver circuit for driving the direct off line of the crossing point of FIG. 4,

Fig. 7 is a schematic representation of a circuit for driving the transmission line of the intersection point of FIG. ² J,

Fig. 8 is a schematic representation of a circuit for driving the receiving line of the intersection point of FIG. ¹ I and

Fig. 9 is a block diagram of a decoding circuit for decoding an interface address and for exciting the direct OUT line for this interface.

Docket PO 968013 / 969OOI

009831/1511

I η ha 1 ts specification

1. General description of the interface addressing 2. Bodywork control unit Operations 2.1 Construction states 2.2 Exclusive construction condition 2.3 Shared construction state 2.3.1 Exposed construction condition 2.3.2 Unassembled condition 2.3.3 Basic commands 2.3.4 Command for non-operation 2.4 I / O check command 2.4.1 Basic sensing command 2.4.2 Setup commands 2.4.3 Build up only 2.5 Build and share 2.5.1 Reset and build 2.5.2 Loosen and cancel 2.5.3 Dismantle 2.5.4 Sensing commands 2.5.5 Sensing authorization states 2.6 Feel the overall structure 2.6.1 Sensing the channel structure 2.6.2 Authorization states 2.6.3 Set authorization register 2.7 State 2.8 2.9

Docket PO 968013 / "969001

009831/1511

2.9.1 Attention 2.9.2 Status modifier 2.9.3 Control unit end 2.9.4 Proven 2.9.5 End of channel 2.9.6 Units end 2.9.7 Unit check 2.9.8 Units exception 2.10 Interface sequences 2.10.1 System reset 2.10.2 Optional provision £, 10.3 Interface separation 3. Shift control 3.1 Interface addressing 3.2 Operating states 3.2.1 Excluded condition 3.2.2 Associated state 3.3 First selection sequence 3.4 Control unit end 3.5 Interface selection sequence 3.6 Sequence initiated by the control unit 4th Sehaltmatrix 5. Versions of the interface switching unit 5.1 Multiple interfaces per channel 5.2 Extended unit addressing 5.3 Manual permanent state 5.4 Hand-controlled construction 5.5 Hand controlled division 5.6 Dynamic divider addition

Cover FO 968013/969001

009831/1511

ORIGINAL INSPECTED

Input-output interface supplements 6.1 New separation point lines

6.1.1 Reset-Off

6.1.2 Solution-On

6.1.3 Vorre cnt-On

6.1.4 Construction-Off

Docket PO 968013/969001

009831/1511

- li -

ι General description of the interface switching unit

The interface switching unit shown in FIG. 1 comprises a Switching matrix 1O, the switching controls shown in greater detail in FIG 12 and the body control units shown in more detail in FIG

The Schaltnatrix IO forms the electrical junction points (subsequent to node points) between the channels 16 and the interfaces 18, which are connected to the control units like the twentieth This part of the switching matrix 10 is called the line part and is responsible for the switching function. The lower four levels of the switching matrix IO include the control part and are used to display the position of the nodes of the line part of the switching matrix.

With each channel 16 is a switch control 12 and a body control unit 14 connected. The switching controller connects and disconnects the nodes of the switching matrix 10 according to FIG Activity of the Ε / Λ interface. The switching control is a ' Unit that is transparent for the channel and the control unit, i.e. the channel operates the I / O steps in the same way as when the switching control would not be connected.

The setup control unit 14 works in connection with the channel 16, the control part of the switching matrix 10 and the switching control so that the commands received from the channel are automatically executed, the connections in the switching matrix via the Sehn Its tr- i; e-

009831/1511

'Pocket? 0 o ^ ic: ~ / Pf ^ CJl

BATH

- 12 - "

tion established and the actual position of the switching matrix be sensed by means of their control part.

The posture is sensed as follows. The shift control 12 provides a connection between the I / O interface of a channel and the I / O interface 18 of a control unit therethrough so that the direct OUT line is energized. The direct OUT line excites crossing points in a vertical line, the comprises the four levels of the control part of the switching matrix. The sensing takes place with the help of the body control unit, which is a Signal on the OFF control line 0 to 3. An output signal occurs on the direct ON line for the corresponding channel in all the matrix positions (in the control part of the switching matrix), in which a crossing point is closed. This is a direct indication of the direct OUT lines that are energized. the Crosspoint switches of the control part of the switching matrix are made available for all channels so that each channel can check the position of another channel.

In Fig. 9, the switching controller can make the connections using the Monitor OFF control lines and disconnect when a connection is established by another circuit control. VJenn e.g. Channel 1 is connected to the U / Zv interface Hummer 4, the address stored in the three-bit address register is extracted from the I / O interface and decoded by the 1-OUT-8 decoder. The voltage on the switch-on line is raised and the connection lock is switched on.

009831/1511

Dccl ·: - · :. rZ yl "- ■■■ ' ; / y. \ ', j

BATH ORIGINAL

1 $ ■ '·. ί- 13 V

Since · output from the decoder is passed through die.Verbindungsver- rlegelung and energizes the direct off-line. 4 The switching control monitors all other connections by activating *

* Gen. the AOS control lines O, 2 and 3 (Fig. 1). If, for example, channel 3 is in connection with interface 4, a disconnection is forced because the direct ON line 4 is energized and the OR circuit is energized, which is connected to the reset input for the .Verbindüngsverriegelung. The AüS control lines are also used to reserve a specific interface connection for a specific channel. ™

The circuit 44 of a shift control (FIG. 2) includes one Interlock for each I / O interface. Whether or not a channel can be connected to a particular interface determined by the position of the associated lock. These locks are set, sensed and reset, only " due to setup commands.

Each channel not only has the possibility to determine whether an ^ interface is reserved or not, but also for which \

Channel it is reserved. In addition, a channel can force a reset for a reserved lock in another channel if instructed to do so by a corresponding setup control. This forced reset is similar to the separation of an interface. If a reservation lock is reset by another channel, the channel whose lock is reset at this point informs you.

009131 / 151t

Docket PO 968OI3 / 969OOI

BATH ORIGINAL

was put through its central unit from this separation an interruption or the central unit is informed of this condition if it tries to initiate a new operation connection to this interface to listi — im A channel whose reservation lock is being reset, while actually connected to an interface, it responds to this condition by attempting normal interface disconnection. If this attempt is unsuccessful due to a failure, the requested channel uses a stronger one Means to force a separation. If instructed to do so by its central unit, the requesting channel becomes a Force direct intersection separation if the channel does not respond ».

The dynamic division, i.e. the division of I / O control units taking one or more channels on a dynamic basis without intervention of the channel is used by the control unit either a superstructure control unit or with manual switches and thus the switching connections are established.

The selection logic 34 of each switching control (FIG. 2) belonging to a channel _{interface is used to monitor the selection or y} call sequences which are initiated by the channel. The selection logic 34 responds to a selection sequence by transferring the address on the output bus via the AND circuit and the OR circuit 42 to the interlocks 44 for visual interface position and control

009831/1511

Docket PO 968 013/969 001

INSPECTED

.discharges. The logic 44 selects the interface indicated by the address and the interface node remains occupied until the channel is available for further operations. A later selection or selection sequence for another address by the channel releases the node.

A selection sequence for an addressed node that is not available results in "Selection ON" being returned to the channel. If the interface is busy for another - channel , the control unit returns a control unit busy status (short sequence) to the channel that initiated the dialing sequence.

The selection logic 34 responds to a selection sequence from the interface 32 by selecting an unoccupied interface of the highest priority that has a service request, i.e., the output of logic 36. If there are no pending requests, a "selection ON" is returned to the channel.

An asynchronous status (units end, attention, etc.) can be selected by a channel if the corresponding node is not used. The switching control remains connected to an interface if a request remains pending and the channel does not dial.

The setup state that the switching control uses to control the node and respond to the channel is rocket PO 968 013/969 o8P ^9831/1511

determined by the manual switch 50 or the body control 14. The construction control unit (Fig. 3) sets the construction statuses and supplies information relating to the status of the switching matrix to the channel via the I / O interface. The structure control unit comprises devices for checking, setting and resetting the structure of the switching matrix as well as devices sum Control of the buildability of the connected channels.

The channel is also in communication with the body control unit as with any other interface control unit. The body control unit can be connected directly to the I / O interface on the Channel side of the switching matrix (see Fig. 1) or to a pseudo-interface on the control unit side of the switching matrix (see Fig. 2) be connected. The body control unit responds to commands from the channel via interface 60. These commands are passed through AND circuit 66 to instruction decoder and register 74. They include basic commands, setup commands, sensing commands and authorization commands. The commands decoded by command decoder 74 are transmitted to the switch control unit (FIG. 2), where the interface status and the control latches 44 execute the command by energizing corresponding node drivers 46. The body control unit sends back status information relating to the switch matrix 10 using the conditions it received from the sense and status generator and register logic 76 from the switch controller. When this sensing data is requested from the channel, the selection logic and sequence control 62 directs the appropriate

009831/151 1

Docket PO 968 013/969 001

- 17 - Information about the AND circuit 82 on the IN line.

2. Bodywork control unit

The set-up control unit shown in Fig. 3 14 provides a means constitute the connection between the system and the interface switching unit. The structure of control unit has facilities for checking, setting and resetting of the structure of the interface switching unit and for determining, with the right of the connected% channels to take over the body control of the switching unit.

The body control unit is connected to the system via an I / O interface or a pseudo-interface (chosen by the switch controller) in connection and all communications between the body control unit and the channel are carried out on the interface as with any other control unit.

1.1. addressing

The body control unit is assigned a consecutive set of addresses (address logic unit 70) on the I / O interface that is equal to the number of interfaces that can be connected to the interface switching unit. Thus the body control unit for a 4x8 switching unit (ie a switching unit which switches four channels between eight interfaces or control units) would require eight addresses. Each address belongs once to an interface, so that the first address on the interface O, the second address on the interface Docket PO 968 013/969 001 009831/1611

etc. is related. The body controller given commands that are not related to a single interface (eg authorization commands), the addresses may be sent to any.

2.2. Operations

All operations carried out by the body control unit are carried out on the basis of commands sent by the unit via the output line receives on the I / O interface. These commands can be divided into four groups: basic commands, set-up commands, Sensing commands and authorization commands (authorization commands) These commands are sent via the AND circuit 66 to the command decoder 74 headed. Their assignments are as follows:

Command code command

Basic commands

1 OOOO OOOO Check I / O
1 OOOO 0011 No operation control 0 OOOO 0100 Basic sensing

Setup commands

0 0010 0011 assembly only

1 0110 0011 Structure and division

0 1110 0011 Resetting and setting up

0 1010 0011 Loosen and cancel

1 1100 0011 Remove

Sensing

1 1000 0100 sense authorization status 1 0100 0100 sense overall structure 1 OOIO 0100 sense channel structure

authorization
O 100 0011 Set authorization register

Docket PO 968 013/969 001 009831/1511

The operations to be performed by the build controller are received from the central unit by a START I / O instruction initiated.

2.3 Construction states

In this context, “structure” is understood to mean the structure, ie the production of a connection planned in terms of circuitry. The configuration states of the tracks in a switching unit are fixed both by the states of the nodes as well as the cutting ä point. The position of a node signaled via the control part of the switching matrix IO (see FIG. 2) defines the relationship between a specific interface and a specific channel. The status of an interface is the sum of all positions of nodes belonging to this interface. The positions of the nodes are explicitly determined by the body control unit on one of the following bridges:

1. A set-up command executed by the set-up control unit.

2. Manual body controls.

3. An unconditional set-up command executed by another set-up control unit of the interface switching unit.

4. A general reset of the system. (See Reset OFF, section).

The positions are determined by the shift control interface position logic 44 in order to Setup instructions and interface operating requirements determine the steps to be taken. The status information

009831/1511 Docket PO 968 013/969 OOl

is still available to the program through sensing commands which are carried out by the bodywork control unit.

2.3.1. Exclusive construction condition

An interface is said to be set up exclusively if one of its junctions is built exclusively for a canal. An interface can thus be defined for one and only a channel must be established. With such a structure, each service request from a unit is made on the interface only routed to the channel for which the interface is set up. Conversely, the units are only available on the interface available for the channel for which the interface is set up exclusively.

2.3.2. Shared construction state

An interface is said to be in the shared construction state if one or more of its nodes are located are in the split construction state. A node is in this state if the associated interface is with divisible to another channel. This structure allows the devices to work with more than one channel without intervening setup commands having to be executed (see section 5).

2.3.3. Exposed construction condition

An interface in this state is exclusive despite Setup for a single channel is prevented from communicating with that channel. All operating requirements of Docket PO 968 013/969 001 0 0 9 8 3 1/15 11

Units of the interface are held back and not on directed the channel. In a similar way, all attempts of a channel are connected to these units on the interface to kick, unsuccessful. A system reset takes place on this interface only when the channel for which the interface is suspended, the system reset is performed.

2.3.4. Unassembled condition

An interface from which no node is exclusive, shared. or is set up exposed, like all of its nodes, is in the non-built-up state. The units on this interface are not available for a channel. For all control units on this interface a constant general default indicated.

2.4. BASIC ORDERS

Since the body control unit is a normal control unit

as your I / O interface port is affected the basic commands with the help of the command decoder 74 (Fig. 3) carry out. The commands are: control command for non-operation,

I / O check command and basic sensing command.

2.4.1. Command for non-operation

This command is executed by the setup control unit regardless of the status of the addressed interface or node or the authorization status of the channel. It is a direct command given with "end of channel" and "end of unit ^11" in the first selection sequence.

Docket PO 968 013/969 001 009831/1511

2.4.2. I / O check command

This command has the double task of canceling a suspended state and checking the state of a node. If the state for the addressed unit (node) is held, this state is presented to the I / O check. If the basic state is mistaken for a unit other than the addressed unit, the construction control unit speaks to the short sequence "control unit occupied". If no state is set to failure or for a unit other than the addressed unit of the If the secondary status is present, the construction status of the addressed node is checked by the I / O test command. If the node is either exclusive or divided or exposed, the body control unit responds with the O-state. If the node has not been established, the body control unit also speaks the unit check state.

2.4.3. Basic sensing command

This command transfers data. The bodywork control unit enforces the impulse operation during this data transfer and finds a status byte at the end of the transfer, whereby End of channel and end of unit are set.

The sensing data provide information about the state of the addressed node and give the reasons for the previously performed unit test in detail. The bits are defined as follows:

Docket PO 968 013/969 001 009831/1511

- 23 byte O

bit definition O Konmando rejection 1 Intervention required 2 Line OFF examination 3 Device testing 4th ++ 5 ++ 6th Build-up injury 7th Authorization violation

+ Set unit check ++ Reserved for future purposes

Byte 1 bit definition O Exclusive condition 1 Shared state 2 Suspended condition 3 Unassembled condition 4th ++ 5 ++ 6th ++ 7th ++

++ Reserved for future use

Docket PO 968 013/969 001

009831/151 1

Command rejection

This sense bit is set when a command is given to the body control unit which is not intended for it or a Requires equipment that is not currently built into the bodywork control unit. The status byte only contains a unit check and is given by during the first dialing sequence which the command was rejected. The states of all nodes and all authorization states remain unchanged.

Action required

This bit is set when the position of a manual assembly switch prevents the successful execution of a setup or authorization command.

Line OFF test

This bit is set when a command is transmitted to the body control unit an invalid parity is detected on the output line or if an invalid interface sequence is determined by the body control unit. The status byte only contains a unit check if it occurs during the first Dialing sequence in which the error was found and it contains the unit check, the end of the channel and the End of unit if an invalid sequence is found after the first election sequence has occurred.

Device testing This bit is set if during the execution of a command

Docket PO 968 013/969 001 009831/1511

a device error is detected by the bodywork control unit. The success of the order is therefore questionable. The device test bit can be set under one of the following conditions: When a setup command is executed, the setup control unit detects that a node is incorrectly not assuming the state to which it was set. When executing a setup command that forces a new setup, the setup control unit cannot force the interface to detach the setup from another interface.

When executing the authorization command, the body control unit determines that an authorization indicator incorrectly does not assume the state it was set to.

The status byte which ends the command in which the error was detected only contains the end of the channel and the end of the unit and unit testing.

Build-up injury

This bit is set when the command "build only" is sent to an interface that is already connected to another channel or when the command set up and Share is delivered to an interface that is set up or exposed exclusively for another channel. if If this bit is set, a unit test is issued.

009831/1511

Docket PO 968 013/969 001

- 26 Authorization violation

This bit is set if there is a construction or authorization command is given via a channel whose authorization bit is not switched on when this command is issued, or whose signal is not switched on Construction OFF is not above. If this bit is present, a unit test is given.

Exclusive condition

This bit is set when the with the addressed node connected interface is set up exclusively for one of the channels.

Shared state

This bit is set if the addressed node is in the split construction state.

Suspended condition

This bit is set when the addressed node is in the suspended construction state.

Unassembled condition

This bit is set when the with the addressed node connected interface is not established for a specific channel including the suspended setup state.

2.5 ASSEMBLY INSTRUCTIONS

To change the state of a node or crossing point,

Docket PO 968 013/969 001 009831/1511

various commands are defined. The commands can be in three Groups are divided. The first group includes the commands that require the setting of a construction status. These commands are successful as soon as the requested structure does not match the structure states of other nodes * or intersection points on the Interface is in conflict. The second group includes the commands that allow the setting of a build state regardless of the Force states of the other crossing points on the interface. The third group includes an instruction that goes to the has no relationship with other nodes on the interface.

All setup commands are direct and, after execution, result in the end of the channel and the end of the unit being set during the first Selection sequence. If the execution was unsuccessful or of questionable success, the status byte also contains the unit check, with the appropriate sensing indicators set.

A setup command can only be executed if the setup control unit is authorized to change setup states. ^ (See authorization command and assembly OFF, Chapter 6.1.4.) If the assembly control unit is not authorized to do so, everyone will Setup command rejected by the fact that the unit check and the display bit are given during the first selection sequence is set for authorization violation.

2.5.1. Build up only

The intersection point addressed is set to the exclusive Build up when all other crossing points are on the

009831/1511

Docket PO 968 013/969 001

- 28 interfaces are not set up.

If the interface was already established for another channel (another crossing point was on the interface in the exclusive or exposed construction state or one or more of the other intersections were d in the divided construction state) , the initial state includes the unit check and the setup violation indicator bit is also set.

2.5.2. Build and share

The addressed crossing point is in the divided construction state set when there are no other crossing points on the interface in the exclusive or suspended construction state are located.

When another crossing point opens up on the intersection is in the build exclusive or suspended state, the initial state includes the unit check and the indicator bit for build-up violation is also set.

2.5.3. Reset and build

The interface belonging to the addressed intersection point is unconditionally reset and the addressed intersection point set in the exclusive construction state.

If the interface was not set up, the execution of the command does not affect any other channel or intersection point and the same result can be achieved using Docket PO 968 013/969 001 009831/1611

achieve the exclusive build. If the interface was in an exclusive, split or suspended structure, all established intersection points (including the addressed intersection point, if this is established) in the not established state (which resets the interface) before the addressed intersection point in the exclusive construction state is set. If an operation with a unit of the Interface expires, the associated channel or sub-channel can encounter an error condition or the "hang" condition.

Since the states of other crossing points on the interface do not exclude the execution of this command, his Execution will only be unsuccessful if a device error occurs. This is indicated by doing a unit check in the initial status included and the display bit for device test is set.

When a program sends a reset and build command to a Interface switching unit and thus reset all units on an interface, it is also responsible for delete the associated unit control words with a "DELETE SUB-CHANNEL" command. When channels share a common Using unit control word memories, this procedure is required to clear these subchannels when units are reset will.

Docket PO 968 013/969 001 009831/1511

2.5.4. Loosen and cancel

The interface belonging to the addressed intersection point is brought into the suspended construction state. If just one pulse operation occurs, an interface release sequence is attempted.

The interface solution becomes through the to the interface Connected channel body control unit on request by the body control unit, which tries the Command executes.

With the exception of the addressed intersection point, all / Crossing points on the cut surface are set in the non-built-up state. When doing an operation with a unit is running on the interface at the time the command is executed, the associated channel or sub-channel can be an error condition or encounter the "hanging" condition. Since the states of the other crossing points of the separation point the execution of this Do not exclude the command, its execution can only be unsuccessful if a device error occurs. This is indicated by that in the initial state a unit test is included and the display bit for device test is set.

2.5.5. Dismantle

If the addressed intersection point is not in the assigned state, it becomes the non-established (dismantled) state set. The states of the other nodes on the interface and also one on another channel with the

009331/1511

Docket PO 968 013/969 001

This means that the operation running on the interface becomes a unit unaffected.

Because the states of the other crossing points on the cutting surface do not exclude the execution of this command, it can only be unsuccessful if a device fails. This condition will indicated by including a unit test in the initial state and setting the device test indicator bit.

2.6. ABFÜHLBEFEHLE etc.

The sensing commands provide information relating to the crossing points to be switched through on the channel.

2.6.1. Sense authorization states

This command provides information related to the channel authorization register. Bit O of data byte O shows when switched on, that the channel O is building the Switching and authorization errors, bit 1 of byte O indicates when switched on that channel 1 is the May carry out construction etc. *

2.6.2. Feel the overall structure

This command provides information about the overall structure of the Interface switching unit. Bit O of data byte O shows im switched on state that the interface O is connected to the channel O. Bit O of byte 1 indicates switched on, ■ that interface 1 is connected to channel O, ..., bit 7 of byte 1 indicates that the interface is switched on connected to channel O. Bit O belongs to interface 15 Docket PO 968 013/969 001 009831/1511

sub channel O. Bit O dee data sensing bytes 2 indicates switched on, that the interface O is connected to the channel 1. Bit O of data sensing byte 2 indicates switched on, that interface 1 is connected to channel 1, and so on.

A command for sensing the overall structure is given e.g. on the basis of a display that an unconditional structure command has been issued Another assembly control unit was executed on the interface switching unit.

2.6.3. Sensing the channel structure

The command for sensing the channel structure provides information about which interface lanes with the issuing the command Channel are connected.

The returned data byte shows the construction status of each Interface. When switched on, for example, bit O byte O indicates that interface O is connected to the channel, ^ who issues the command. Bit 1 byte O indicates that interface 1 is connected to the channel sending the command, etc.

2.7. ELIGIBILITY

Each body control unit has an authorization status. The authorization status is indicated by a register or by authorization manual control switches. The authorization register is activated by authorization commands or during the system or system main reset is set according to the manually predetermined state. Docket PO 968 013/969 001 009831/1511

The authorization status allows the execution of authorization and setup commands. In addition, a low signal on the build-out line may prevent these commands from being executed.

SET AUTHORIZATION REGISTER

Set channel authorization register: The channel authorization register is selected and set according to the bits in the control command code. Bits O, 1,2 etc. indicate channels O, 1, 2 etc.

If a bit identifying a certain channel is switched on, the authorization and set-up commands can be carried out by the associated Channel construction control unit are executed. If the bit is not set, the attempt to execute the command is made unsuccessful, which is indicated by the fact that in the initial state a unit check is included and the sense bit for the Authorization violation is set.

2.9. STATE

The following status bits are set by the build control unit used:

Bit position description O Attention 1 Status modifier 2 Control unit end 3 Proven 4th End of channel 5 Unity end

Docket PO 968 013/969 001 009831/1511

6 unit examination

7 unit exception

Note: State can also be generated by switch control.

2.9.1. Attention

The "Attention" status bit is only used together with the status bit used for unit checking to detect an asynchronously occurring indicate abnormal condition. The two bits can either be in an asynchronous state sequence or based on an I / O check are given. The bits Attention, Unit Check and Occupied are given if a command does not have an I / O check for a Unit is received after the attention and unit check bits have been generated, but before the status is accepted by the Channel. The attention bit is only given together with the unit check bit or with the unit check and occupied bits.

2.9.2. Status modifier

The bit is only given together with the Occupied bit and shows the occupancy of the control unit. The condition is only displayed when the bodywork control unit has a primary condition (i.e. end of channel, end of unit) is considered to be a unit other than the addressed unit and is always used with the help of the short occupancy sequence given for the control unit. The status modifier bit is only given together with the occupied bit.

2.9.3. Control unit end

The status bit for control unit end is used to indicate that a previously displayed occupancy condition of the control input

009831/1511

Docket PO 968 013/969 001

is no longer available. The bit can be present alone in an asynchronous status sequence due to an I / O check or together with an occupied bit due to a command, no I / O check. The bit control unit can end together occur only with the busy bit.

2.9.4. Proven

The busy bit indicates either that the addressed unit is in a running state or the like together with the Status Modifier bit that the structure controller is busy. The occupied bit is given with other status bits that do not represent an I / O check for an addressed unit in the case of a command. The occupied bit can either be given for control unit occupied or for unit occupied only on the basis of a first selection sequence and in all cases indicates that the command has not been executed or has only been checked.

2.9.5. End of channel

The end of channel bit is always given with the end of unit bit H and indicates the completion of a command execution. The end of channel and end of unit bits never appear separately from one another on. If the command was executed abnormally, the unit check bit is added to these bits. Additionally can the busy bit occur if the unit was not addressed by an I / O check before the end of the channel and the units End (as well as unit check, if generated) have been accepted by the channel.

Docket PO 968 013/969 001 009831/1511

2.9.6. End of units see end of channel

2.9.7. Unit check

The unit check bit is set to indicate the presence of a show exceptional condition. The unit check bit is only given on the basis of a first selection sequence and indicates that the command received could not be carried out. The bits in the Sense byte describe the extraordinary Condition. When the Unit Check bit is given along with the End of Channel and End of Unit bits, it indicates that a exceptional condition was found in the execution of the command. The unit check is carried out with the attention bit is given together and indicates the asynchronous occurrence of an abnormal condition. The busy bit can be used in any of the above Combinations of states occur.

2.9.8. Unit exception

is available for definition.

2.10. INTERFACE SEQUENCES 2.10.1. System reset

A system reset received from the body control unit leads to the resetting of all current states, state conditions or currently running operations in the construction control unit. This provision does not affect the in any way Construction status or authorization status of a node or this at another construction control unit.

Docket PO 968 013/969 001 009Ö31 / 1511

200Ö930

2.10.2. Optional provision

The body control unit responds to the command of an optional or error reset in the same way as with a general reset.

2.10.3. Interface separation

By means of an interface separation sequence, the body control unit leaves the operation input line directly and thus all others Interface lines fall. When the interface separation. (| no I / O check after a zero initial state for a command but is received before an end state, the data transmission will also end, end of channel and end of unit generated and request ON raised to request the reproduction of the end state. One at any other time received interface disconnection sequence has no effect.

3. SWITCH CONTROL

By monitoring the I / O interface, channels 30 and the The switching control shown in FIG. 2 can transfer set-up states to the crossing points via the control part of the switching matrix 10 control in the line part of the switching matrix 10 and deliver all the necessary interface response signals temporarily sets states of the crossing points as a result of the monitored operation of the interface lines and makes this information available to the operating system via the body control unit 14. The control by the switch control takes place in such a way that neither the channel 30 nor the control units 20 perceive the intervention of this switch control Docket PO 968 013/969 001 009831/1511

to need.

3.1 INTERFACE ADDRESSING

The specific I / O interface addressed by a channel in a first selection sequence is controlled by the switch is determined by examining the address passed on the OUT line through AND circuit 40 from the channel. Part of all Addresses is intended for the identification of the interfaces. ^ This part can be the significant bit or the bits of the unit address byte. It can be the second address byte if a Two-byte I / O addressing is available on a channel but is not connected to a control unit. It can be the significant bit or the bits of the second address byte, where both the channel and the control units with the Two-byte addressing work.

The bit combination actually to be used is set at the point in time when the interface switching unit ~ is installed or as soon as the component layout of the installation is changed (e.g. by hand switch, bridging plug or cards, etc.).

With a 2x4 interface switching unit (i.e. two channels and four I / O interfaces), in which all intersection points are set up or divided and those with one-byte addressing works, in this case it would be advisable to use the two significant bits of the eight-unit address bits for the Assign interface selection. The six remaining bits erroög-Docket PO 968 013/969 OOl 009831/1511

64 unit addresses per interface. (It should be noted that if the same group of four addresses are assigned to each of the two bodywork control units, an interface only has 60 addresses available for units on this interface .)

3.2. OPERATING STATES

The monitoring of the operations at the crossing points of the interface switching unit via the control part of the switching matrix d 10 in FIG. 2 entails the establishment of certain operating states of the node and thus of the interface. These states indicate the state of the connection and are used for the correct management of the sequences initiated by the control unit as well as for determining the connectivity of other channels with the interface.

3.2.1. Connected state

If a channel is in active connection with a control unit, i.e. the control unit has the line STATE ON or Operation ON above or when the line select is OFF from the channel on top of the interface or during the time of the From the end of the unit until the next selection of the chain command, the crossing point is considered to be in the connected state currently referred to. While the intersection point and thus the interface are in the connected state, can no other channel can be connected to the interface.

A channel can therefore only be connected to one interface at a time. Docket PO 968 013/969 OOL 009831/1511

- 40 - and one interface can be connected to only one channel *.

3.2.2. Associated state

Name the interface switching unit so that Operations including a chain of operations must be terminated bit de «channel that initiated the operation, the associated crossing point is in the assigned state. In this state, all of the control unit initiated sequences given on the channel to which the interface is assigned.

An interface can only be used at a given time

can be assigned to a channel, but several channels can be assigned to a channel

Interfaces are assigned.

If the interface switching unit with dialing channels one single system is used, the crossing points for this channel do not need to be transferred to the assigned state because the connected state takes on the same function. Similarly, the connected state is sufficient when the interface switching unit is used in a system that allows the channels to share unit control words allowed. In all other cases, the assignment status is required.

The duration of the assigned state can vary depending on the Change the system to which the interface switching unit is connected. When two systems are connected (where Docket PO 968 013/969 OOL 009831/1511

20Ö0930 '

it is assumed that control blocks are not divided) must the associated state includes not only the chain of operations but also any required error recovery. If the interface switching unit alt several central units is used that share the corresponding control blocks with each other, the ordered state only needs to be maintained, until the final state of the operation or chain of operations is accepted by the channel.

3.3. FIRST SELECTION SEQUENCE

If raised by channel 30 address OFF and then selection OFF are, the selection logic 34 initiates a selection sequence which 'the address on the OFF line via the AND circuit 40 and the OR circuit 42 conducts to the logic 44. Logic 44 examines the address on the OUT line and selects the appropriate crosspoint drivers 46. If the crosspoint is not connected to the channel or is in the suspended state, the selection logic 34 causes selection OFF to be sent back to the channel as selection ON and it does not find any Separation point selection sequence instead. If the node is built up exclusively to the channel or is built up and divisible and the interface is not occupied by another channel, the crossing point is set to the connected state and the selection sequence can be carried out normally on the addressed interface. When the crossing point is built and is divisible, - the interface is occupied with another channel, the switch control signals a sequence control unit occupied to the channel and the interface selection sequence Docket PO 968 013/969 001 009831/1511

does not take place.

3.4. CONTROL UNIT END

If a sequence control unit Occupied by the switch control unit was returned due to a first sequence »is the subsequent state control unit end is normally given, when the interface is no longer occupied. The I / O address accompanying the control unit end is the address of the I / O interface lane.

If at the time at which the channel tries to address a unit on the associated interface, a Control units end is at the body control unit, this outputs the status bit for control unit end together with the Status modifier and the occupied bit back (short sequence for control unit occupied).

3.5. INTERFACE SELECTION SEQUENCE

The I / O interface sequence used by the channels to handle the data and service requests is called the dial sequence designated. This sequence is used by some channels as a response to an ON request, while other channels select as soon as there is no other activity taking place in the channel. '

A dialing sequence determined by the dialing logic 34 results in the lines request ON at the intersection points that su belong to the channel and are led to logic 44 via the AND circuit 38 and the OR circuit 42. the Docket PO 968 013/969 001 009831/1511

Dialing sequence runs to the interface with the highest priority,

whose line requirement is ON above and which either exclude Lich is set up or set up and shared for this channel and is not occupied by another channel. Any interface is considered occupied when choosing (if it is not already) and the state of the corresponding crossing point in the control part of the switching matrix 10 is set (if this has not already happened). If no line request ON an interface connected to the channel or on a built-up and shared interface that is not occupied by the channel Interface is up, selection ON is returned by selection logic 34 (indicating that no request »Tan requires an operation).

3.6. SEQUENCE INITIATED BY THE CONTROL UNIT When a control unit 20 receives data or a status operation it causes the EIIN request to be raised on the interface. The switch control logic 36 monitors the line request ON for all interfaces, which it is exclusively constructed or constructed and shared (and not occupied by another channel). If such a signal is detected and the channel is idle, will ON request sent on the channel. If choice OFF is raised as a response to it and the interface is not with is occupied by another channel, the crossing point is set to the occupied state and the dialing sequence proceeds normally. if the interface was occupied with another channel, the signal request ON is accepted and the dialing sequence can be the Docket PO 968 013/969 001 009831/1511

Do not affect the interface.

4. SWITCHING MATRIX

The switching matrix 10 in Fig. 1 consists of transit gate crossing points (Fig. 4), which with a standard I / O separation point to are using. The switching matrix takes the I / O interface lines and other lines (control OFF, direct AOS and directly EIN), which are used together to create the dynamic to coordinate electronic rebuilding of the system.

Since the crosspoint switch is central to the system, reliability and availability are the main considerations. To do this, the crossing point avoids the use of a local power source, electricity is indirect to everyone Crossing point fed by the channel controlling that crossing point and by the natural current levels of the signals on the I / O breaker that passes through the crossing point.

The crossing point is shown in FIG. A crossing point is switched on or brought into the conductive state by saturating the transistor via its base resistance. That takes place by lifting the signal line "Direct OFF", which is supplied by the switching control is applied to the switching matrix. Data signals that are on the "transmission line" of the I / O interface at the collector Arriving at a selected crossing point are weakened by the drop in saturation of the transistor and passed on to the emitter.

Docket PO 968 013/969 001 009831/1511

20Q0930

. .The running side through a one crossing point is determined by the relaxation time of the majority carriers shown in FIG. The basic charge distribution of a saturated one Crossover transistor not conducting signal assumes Start profile A. When a signal arrives at the collector, the base charge recovers or relaxes to »Profile B. During the transition period, the base range is analogous to one three-dimensional resistor-capacitor network, whose time constant is measured in picoseconds. The signal delay through the crossover switch is therefore mainly due to the wiring and can be around 9 nanoseconds.

The one to ignite a crossing point in the conductive state or the time required to separate a crossover point from the conductive state is primarily determined by the service life of the charge carriers in the base region. This delay can be in the Order of magnitude below 35 nanoseconds.

The smallest voltage amplitude of the Direct OUT signal to the cross point base is the largest current required to keep the cross-point transistor in saturation while conducting a minimum I / O interface signal level on the transmit line. The highest level of the direct The expeller is the amount of the permissible level shift on the interface lines due to the base current. Typical Values are 150 millivolts or approximately 3 milliamps of the base

Docket PO 968 013/969 001 009831/1511

BATH ORIGINAL

- 46 -stromes.

A suitable direct OFF driver (Flg. 6) works with a 12 volt power source. It is assumed that a 3.6-Klloohm-ITLderstand the base insulation of the cross-point switch of the Flg. 4 supplies. This resistance value in connection with the criteria mentioned above leads to amplitudes between 9.97 volts and 12.08 volts on the direct OUT driver line at the crossover point. The circuit works with PNP transistors T3 and T4 in the output stage in order to take full advantage of the driver toleranceNsrelch and to provide short-circuit protection for the driver circuit to be able to. When a direct OFF driver is on, T3 and T4 are saturated. When overloaded, the transistors will unsaturated and the current limited by the emitter series resistors. The NPN transistor T5 in the output circuit provides one Slightly negative P% el when the direct OFF driver is switched off, eliminating crosstalk from one data lane to another is kept at the lowest possible value via unselected crossing points. The emitter series resistors (e.g. 200 Ohm) serve to limit the power consumption at the collector of the driving NPN transistor. The driver has an output impedance of approximately 11 ohms and rise and fall times less than 1OO nanoseconds.

5. VERSIONS OF THE INTERFACE SWITCH UNIT

While a complete interface switch unit definition has been described in the preceding text, most

Docket PO 968 013/969 001 009831/1511

BATH ORIGINAL

Needs addressed, most applications do not require the full possible capacity. For these situations subsections of the full definition can be referred to above deliver adaptable and modular switching applications. Several of these subsets are described below. For Each version will first have the objectives and specific requirements of the application and then how it works is described.

5.1. VIBLE INTERFACE PER CHANNEL

The electrical values of the I / O interfaces can be those for Control units and lines available total resistance restrict. This means that long cable lengths are only possible if few control units are connected and many control units can only be connected using short cables. Very often, however, both long cables and numerous control units are required. Thus, what is needed is a switching unit that meets the following requirements Fulfills.

The switching unit measures several interfaces in one for the Channel, the control unit and the program can be connected to one channel in a transparent manner. She has to either Selector or multiplex channels and can work with pulse (single point) or multiplex control units.

The interface switching unit consists of a control switch and a switching matrix. A construction control unit will not Docket PO 968 013/969 001 009831/1511

required because the structure is fixed. The complexity of the shift control is further reduced for this version as only ■ One channel is being worked on and the setup states are constant are. The Schaltina tr ix is reduced to a trivial case.

A first selection sequence through the channel results in the interfaces being selected one after the other, while address OFF and Line OFF can be given to all interfaces in parallel or one after the other. If the selection ON is returned by an interface, indicating that the addressed unit is not connected to the interface, selection OFF is passed to the next interface until a unit or control unit responds or until all interfaces have been selected are.

When a control unit requests operation, the channel initiates a dialing sequence. The switch control selects the interface for selection that the operator requests. If there is no bed service request, selection is ON directly on the channel returned.

All provisions of a general nature and error provisions are given in parallel to all interfaces. The provisions assume the same function as it is currently defined and do not influence the states of the interface switching unit.

Docket PO 968 013/969 001 009831/151 1

5.2. ERNBITEHTK UNIT HADIUEESSIEROIIG

Through the one-byte address used on the interface 1st the number of units per channel is currently limited to 256. The possibility of »using another byte was made for the Channels defined but not currently being used by a control unit. A switching unit can meet this need cover that meets the following requirements: The switching unit missed to be able to multiple interfaces ■ 1t one channel in one for the control unit, the channel and to connect the program in a transparent way. You need either with selector or multiplexor channels and with single or Hultiplex control units can work. The switching unit the individual control units must be able to select an additional address byte supplied by the channel. In addition, the switching unit must be able to expand the address with the corresponding additional address byte if a unit sends its address to the Channel there.

As can be seen from the requirements, this is the need opaque switching unit an extension of the first version described above. Except for the options described there it is possible to add an additional address byte both in the interface switching unit and in the channel handle.

A first dialing sequence includes sending one of two bytes existing address from the channel to the switching control. The second byte addresses the interface to which a unit is connected

00Ä831 / 1511

Docket PO 968 013/969 001

and the first byte denotes the unit. The shift control thus selects the addressed interface and the first selection continues. If options ON from the chosen interface is returned, no other interface is selected and Select ON is returned to the channel. The switching control aniss ensure that the additional address byte ■ it the correct marking and marking parity to »correct Time is supplied on line ON.

When a unit or control unit has a condition request and the channel responds with a dialing sequence, the switching control ensures that only the requesting interfaces to get voted. When address information is returned by the Control unit is given to the channel, the switching control expands the address by the address belonging to the interface additional address byte.

5.3. MANUAL CONTINUOUS STATE

In numerous switching situations it is sufficient to have a device for manually setting up a system if the system stands. The same effect can be achieved by changing the interface wiring to obtain the desired combination of components.

5.4. HAND-CONTROLLED CONSTRUCTION

If a shift does not require programmed switching and stopping the system to switch is unacceptable, becomes a manually controlled switching unit with a logically determinable socket PO 968 013/969 001 009831/1511

th switching time used. Such a switch is made by hand actuated, but is only effective if a circuit monitoring the activity of the interface determines that the switchover can take place without interface errors. The desk is used in conjunction with programming and operator activity to such an extent that the activity on the Interface has stopped before the manual switchover takes place. The manually controlled logic switch must meet the following requirements:

The switchover must have a facility for connecting each connected interface to a connected channel Allow the handset to be dimensioned. The switching unit must provide the actual separation and connection of the interface and Delay channels until a point has been reached in the activity of the interface that enables switching to without errors the interface. The switching unit must either have selector or multiplexor channels or either Single or multiplex control units work. Once the switchover has taken place, the switching unit must exist be transparent to the channel and the control units.

The interface switching unit that fulfills these requirements consists of a switching matrix and is a simplified switch control. Since no programmed control of the switchover is required, no body control unit is required. Of the The construction status of each crossing point is indirectly determined by the position of the hand switch for this crossing point.

009831/1511

Docket PO 968 013/969 001

- 52 -The construction status differs from the switch position only during the logically determined delay in construction.

If a manual set-up switch is toggled, investigated the switching control the operating state of the intersection belonging to the interface. Is the intersection point la connected or assigned state, the reassignment indicated by the band switch is suspended. When the crossing point is no longer connected or assigned is set, the interface is switched and is therefore only used with the channel specified by the manual switch tied together. This new connection to the new channel can normally be made regardless of the activity in the new channel, but must nevertheless be made so that on the no cutting part errors occur in the new channel.

5.5. HAND-CONTROLLED DIVISION

Most situations that require sharing of control units between channels require a minimum of new construction which can be accomplished by hand-operated devices. Thus, an interface switching unit must be designated which defines a structure by means of manual switches 50 (Fig. 2) and provides all the necessary circuitry to allow the sharing of units, control units and interfaces among the channels. The requirements thus include the following: The switching unit must set up multiple interfaces on each channel and allow multiple channels to each interface. It must represent a manual switching device for producing the overall structure of the cut surfaces and channels. It has to be

009831/1511

Docket PO 968 013/969 001

Logical device are provided, which makes the division and the connection between the channels for the cut surface. The facility must operate in such a way that its intervention does not produce any indications that a normal operating system cannot easily process. The switching unit only needs to provide the division between selection channels that work with only one common central unit. Multiplexor channels and channels that work with several central units or are divided among them are expressly excluded.

This version of the switch unit requires a switch matrix and switch control. Since a hand structure is used, no body control unit is required.

The set-up states are determined by the hand switch. The only possible states for a crossing point are the shared build and the not built state. As with the With the logically controlled assembly version of the switching unit, the manual switches do not directly determine the state of the crossing point but initiate a switching action that is only completed if the interface conditions allow it. Of the Exclusive built-up state is effectively available because the shared built-up state has only one crossing point is used on the cut surface.

The switch control sets the connection state for a cross point when selection OFF is directed to the interface either for dialing or for di & first. Election sequence. The Kreu-Docket PO 968 013/969 001

ORIGINAL INSPECTH)

Zung point remains in the connected state, sent to election OFF from the same channel but is not directed to the interface. With a 2x4 switch, e.g. with channels 1 and 2 and the interface rows A, B, C and D, channel 1 initiates a selection sequence for interface A after the main reset. Upon receipt of the selection OFF and determination of the addressing of interface A, the switch control sets the crossover point to the connection state. This status is retained during the subsequent operation, since according to the definition of the selection channel, only one unit is handled from the receipt of START I / O to the acceptance of the first status by the central unit. Repeated first dialing sequences for the same unit or / any units on the interface do not lead to the resetting of the connected crossover point. However, if channel 1 addresses a unit on interface B, C or D, the switch control of the cross point for interface 1 resets from the connection state and the cross point for the addressed interface into the connection state. An attempt by channel 2 to address a unit on an interface whose intersection point for channel 1 is in the connection state receives the sequence control unit busy as the address.

The switch control raises the ON request to the channel as soon as one of the interfaces set up for the channel has its ON request line up or as soon as one of the crossing points for this channel is connected. (The last mentioned condition provides the required locking for the Docket PO 968 013/969 001 009831/1511

Resetting of the connected state, since a selection channel is open Request EIN with a dialing sequence only responds after the first state has been deleted. With some channels the dialing sequence occurs automatically and therefore the signal is raised Requirement ON redundant.)

According to the definition of the connection state, only one can of course The node per interface and channel is in the connected state.

Since this application of the switching unit to channels for the same Central unit is restricted, the output of the control unit can be switched off in the connection state, by which end Signal the switch control indicates that the control unit is no longer occupied. This resetting of the connected state is always associated with the occurrence of a first status and the output of this first status is sufficient to start I / O again to initiate unsuccessfully.

The asynchronous state (not preparing the end of the unit for one Transition, end of unit after assuming a non-chained one End of channel, attention, etc.) is given to the channel that responds first to the line ON request. If more than one Channel appeals, only one succeeds, the others receive it Select ON back and request ON drops for this channel.

DYNAMIC DIVIDER ADDITION If there are multiple multiplex channels the unit control word memory

009831/1511

Docket PO 968 013/969 001

divide, this division can be designed much more dynamically than in chapter 5.6. described. With this type of division, any channel can handle service requests from any unit and the crosspoint connection only needs to be maintained as long as the interface is in the connected state. This type of division gives the greatest performance improvement and can be controlled manually or by programs.

6. INPUT-OUTPUT INTERFACE ADDITIONS To meet all the requirements of the I / O interface circuit, Certain functions of the I / O interface are required that are currently not available. Some of these Functions has been proposed at different times for different purposes, and so have the circuit requirements are available, their application seems justified. Others are required for proper switching operations.

6.1. NEW DISCONNECTION CABLES

Three new lines have been defined for the I / O separation point. One line is "outbound" from the channel to the switching unit, two others are from the control unit to the switching unit and the "inbound" channel.

6.1.1. Reset OFF

If the system of which the switching unit forms a part is * divided into subsystems, each of which has its own central processing unit, provisions generally have to be iso-

Docket PO 968 013/969 001 009831/1511

200Ο930

- 57 -

llert be so that only the parts concerned will be reset and also a provision must be provided, which is independent of the subsystems. For the subsystems defined system and optional provisions apply. In addition , a new total or main reset is defined, which can influence the states of the intersection points and reset the entire system. The reset is similar to the defined system reset with the additional requirement that the new identification line labeled Reset OFF must rise before Operation OFF falls and must remain up for the same period of time as Operation OFF is down. To take effect, Reset OFF must increase before Operation OFF decreases and remain up until after the Operation OFF increases. Operation OFF must stay down until Operation ON drops out.

The reset caused by the OFF reset influences the states of the intersection points and, if applicable. also the authorization status by setting each state according to a predetermined pattern. The provision can thus be the state of a change to a particular node or not, depending on whether it has been in another since the last main reset State has been set or not. Resetting turns on the channel authorization bits.

6.1.2. Solution ON

The disconnection ON line is supplied by a control unit and warns the channel and the switching unit of a condition which was detected on the control unit and requires that

009831/1511

Docket PO 968 013/969 001

the control unit is disconnected from the interface (e.g. failure of the power supply). The channel must then take immediate steps undertake to cease activity on the interface. The interface switching unit reacts by setting the set-up states for the interface in the set-up and suspended State.

Prerogative ON

A new line with the designation priority ON indicates to the channel and the switching unit that a unit. or control unit on the interface has priority over the connected channel . The use of this line allows the channel and the switching unit to determine when disconnection, division and switching of the interface are permitted.

This line is raised by a control unit when a command is received for an attached unit and remains up until the final state has been accepted. If there is an error condition, this line remains up until the sensing data is cleared.

Structure OFF '

A line with the designation Structure AUS from the channel to the interface control unit is used in connection with the AUS identification lines to provide the following special function:

Reconstruction is permitted if the assembly OFF is raised and the command OFF is raised during the first dialing sequence. Structure AUS must be connected to Docket PO 968 013/969 001 009831/1511

€ 2 00930

of the setup control unit for a period of time required for the single bit to designate the command byte on the OUT line as valid.

Docket PO 968 013/969 001

009831/1511

Claims (12)

200093Π - 60 PATENT CLAIMS 1. Data processing system with one or more input / output channels and one or more input / output control units, characterized by a matrix switching unit (10) with a first sub-unit (upper part in Fig. 1) for connecting the channels (16) with the control unit or units and a second sub-unit (lower part in Fig. 1) for storing the occupancy status of the matrix connection points in the first sub-unit, and switching control units assigned to the channels (Fig. 1), which are operated by the channels and by the input / Output control units receive request signals, query the second sub-unit (control OFF) and evaluate received status signals (direct ON), as well as Generate signals (direct OFF) for switching through or interrupting the connection points in the first sub-unit. 2. Data processing system according to claim 1, wherein in each case a number of control units in an interface device is summarized, characterized in that in the first sub-unit for each interface line a matrix level is provided, one row each for a channel and one column each for an interface device is assigned that a matrix level is provided in the second subunit for each channel, with one row each with an interrogation line (control OFF) and one column each Docket PO 968 O13 / 9f> n ooi 0 0 9 8 3 1/15 11 is connected to a status receiving line (direct ON) of the trunk group of the relevant channel, the Switching lines (direct OFF) at the same time corresponding connection points in the first subunit as well as in the second subunit switch through, such that an interrogation signal on an interrogation line via the switched through Connection point is transmitted to the status receiving line and indicates which connection points in the first subunit are switched through. 3. Data processing system according to claim 2, characterized by a transistor (Fig. 4) as a matrix connection point, which is driven into saturation by the switch-through signal (direct OFF) at the base and during the signal passage is maintained in saturation by the signal voltages from the channel and from the input / output control unit is fed (Fig. 7, 8). 4. Data processing system according to claim 3, characterized in that that the driver stage (Fig. 6) has a non-switched transistor at the base with a signal from controls a polarity opposite to the polarity of the switching signal. 5. Data processing system according to claim 3, characterized in that that the signal generated by the driver stage (Fig. 6) does not show an impermissibly high potential shift Pn Qfift Oll / QfiQ ΟΩ1 Π fl .Q 8 1 1 / U 1 1 - 62 caused the transistor electrodes. 6. Data processing system according to claim 1, characterized by a switch controller (12, Fig. 1; Fig. 2) in the switch control unit with a priority selection circuit (36) to select the requesting control unit (2O) from a row with the highest priority, with the inputs the priority selection circuit on the first sub-part of the matrix switch unit. 7. Data processing system according to claim 6, characterized by a priority control and link solution circuit (52) for selecting one of several switching controls (12) requested by a control unit (20), which only respond to the request signals (request ON) an input / output control unit responds. 8. Data processing system according to claim 7, characterized by an interface status device (44) with a Toggle circuit for each input / output interface device and those with the switching lines (direct OFF), query lines (control OFF) and status receive lines (direct ON). 9. Data processing device according to claim 8, characterized by a structure control unit (14, Fig. 1; Fig. 3) with an instruction register and decoder (74) for receiving 009831/1511 200093Π Commands from the associated channel, which commands specify the setup options that are taken into account by the switching control (12) when connecting the connection points and when sending response signals, the setup control unit setting the toggle switch (44) in the interface status device. 10. Data processing device according to claim 9, characterized in that the interface status device (44) is connected to the construction control unit (14) and can switch on all interrogation lines in order to monitor the connection of all channels and switch off an interface device when this interface device is requested, but is already connected to another channel. 11. Data processing device according to claim 10 for dynamic multiple connection between channels and input / output control units, characterized in that request signals and other control signals are sent from the channels to the input / output control units via the switching control unit and response signals are supplied by the input / output control units that one devices (44) are provided for monitoring the input-output control units, which respond to response request signals from these control units and send these response signals and control signals to the channel belonging to the relevant device (44). 009831/1511 12. Data processing device according to claim 12, characterized by a selection logic (34), which on the input side via a Connecting device (32) is connected to a channel and generates a selection sequence signal and a selection sequence signal, whereby an interface device specified by an address received from the channel is selected and a busy signal is sent to the channel when the selected section Location device is connected to another channel and with the selection signal the unoccupied cut ί The highest priority site setup that a Sends request signal (request ON) is selected will. λ ORIGINAL INSPECTED Docket PO 968 013/969 001 0 0 9 8 31/1511