SU1368886A1 - Device for interfacing input-output channel with external devices - Google Patents

Abstract

The invention relates to computing and can be used in control systems for transmitting information from digital computers to input / output devices. The aim of the invention is to expand the class of tasks to be solved by allowing the operative change of the order of servicing blocks (chains) of main and additional external devices. The goal is achieved by introducing a priority block containing a decoder into a device containing a channel amplifier unit, a subscriber amplifier unit, a group of amplifier-receivers, a group of amplifier-transmitters, a group of elements OR, a session resolution session block and a group of blocks of signal subscriber signal storage. , a group of elements AND, a group of elements NONE element OR or a delay element. 2 hp f-ly, 1 ill. 5 cl

Description

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The invention relates to computing, in particular, to control devices for transmitting information from digital computers to devices for output and output, and can be used in computer systems with an expanded number of external devices.

The aim of the invention is to expand the class of tasks to be solved by enabling the operational scheme of the order of servicing blocks of main and additional external devices.

The drawing shows the block diagram of the device.

The device contains information output 1, input 2 of information and control signals, output 3 of identification signals, input 4 of identification signals, input 5 of the address identification signal, output 6 of the operation control signal, output 7 of the demand control signal, main output 8 of the sample, input 9 samples, the main input 10 samples, output 11 samples, additional inputs 12 samples, information inputs 13, outputs 14 information and control signals, inputs 15 of the identification signal, outputs 16 of the device identification, outputs 17 of the ideal signal address adjustments, operation control inputs 18, additional control demand signal inputs 19, main control signal input 20 inputs, additional device sampling signal outputs 21, amplifier-transmitter 22, amplifier-receiver 23, amplifier-transmitter 24, amplifier receiver 25, amplifier transducer 26, third input amplifier 27, amplifier transmitter 28, amply open contacts 61-63 of the first - third switching elements, decoder 64, inputs 65 of setting priorities, input 66 of setting mode, a group of elements in AND 67, a group of elements is NOT 68, an element of OR 69, elements of 70-72 delays, blocks 73 for storing the subscriber's demand signal, which contain elements of AND 74 - 77, an element of OR 78 and a trigger 79.

The block 80 of nominal amplifiers is formed by amplifiers-receivers 23, 25 and 29, groups of amplifiers-transmitters 51-53 and delay elements 48 and 49.

Groups of amplifiers-receivers 54 - 57, the element OR 37 and amplifiers-transmitters 22, 24, 26 and 28 form

block 81 subscriber amplifiers.

The session resolution block 82 consists of input amplifiers 31, 32 and 27, output amplifiers 30 and 33, elements 35, 42 and 43, elements

OR 36 and 41, triggers 44 and 45, delay elements 71 and 72, and NOT elements 38-40.

The priority block 83 consists of a decoder 64 priorities, groups of elements And 67 and NOT 68, element ILY 69 and element 70 of delay.

The drawing also shows an 84 I / O, block 85 of the main external devices and blocks (chains)

86 additional external devices. Output lines 1 and groups of inputs 13 are a collection of subscriber buses (9 lines) and a measurement bus from the subscriber. Entry lines 2 and grupps

Outputs 14 are a combination of channel bins (9 lines) and control buses for channel operation, channel blocking, sampling resolution, measuring from a channel, and changing

tel receiver 29, the first output usi-45 and channel.

amplifier 30, first and second input amplifiers 31 and 32, second output amplifier 33, group 34 amplifier amplifiers, first AND 35 element, first OR 36 element, OR 37 element, NOT 38-40 elements, second OR 41 element, second 42 and the third 43 elements And, the first 44 and second 45 triggers, a group of elements OR 46, delay elements 47-49, groups of amplifier-transmitters 50-53, groups of amplifier-receivers 54-57, normally closed contacts 58-60 of the first - the third switching element, norLine, connected to output 3 and to each input 15, is a collection of w N: address from a subscriber, the subscriber management information from the subscriber.

The lines connected to input 4 and to each output 16 are a combination of control busses from the channel and information from the channel.

The line connected to input 5 and with each output 17 represents the address bus from the channel.

The line connected to the outputs 6 and 7 and to each input 18 and 19 is the subscriber's work bus and the subscriber's demand bus, respectively.

The line connected to the output 8 of the sample and the input 10 of the sample represents, respectively, the sample bus from the channel of the main chain of external devices.

The lines connected to input 9 and output 11 are, respectively, the sampling bus from the channel and the sampling bus from the subscriber.

The lines connected to each of the inputs 12 and each of the outputs 21 represent, respectively, the sampling bus from the subscriber of the additional chain of external devices and the bus from the channel of the additional chain of external devices.

The line connected to the input 20 is the signal bus from the subscriber of the main chain of external devices.

The lines connected to the inputs 65, the priority settings, are a set of buses, the signals on which define the number of the chain (block) of external devices with the highest priority.

The line connected to the mode setting input 66 is the busJC signal on which determines the mode of operation of the device: with or without priority.

Amplifier-transmitters 22, 24, 26 and 28, amplifiers-transmitters 50, 51, 52 and 53 groups, output amplifiers 30 and 33 are a driver

signals for i, issuing them to cable lines, the number of which is determined by the number of lines connected to each of the outputs of the device.

Receiver amplifiers 23, 25, -27 and 29, receiver amplifiers 34, 54, 56 and 57, input amplifiers 31 and 32 are signal conditioners for receiving them from cable lines, the number of which is determined by the number of lines connected with each of the device inputs. The pins 61 and 58, 62 and 59, 63 and 60 of the switching elements (relay contacts) are used to disconnect the additional units 86 without disturbing the operation of channel 84 with a chain of 85 main external devices.

The device works as follows.

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All connections to channel 84 are made via common buses, so that any signal coming from the channel is available to any external device control unit in each of the main 85 and an additional 86 chains of external devices. The same signals coming from the control units of 10 external devices and additional chains of external devices, after amplifiers-receivers, are combined into the installation OR at the input of the corresponding amplifiers-transmitters or lines of the Delay. The only exception is the sample signals from the subscriber of additional chains of external devices, which through the corresponding amplifier-receivers arrive at the corresponding 20 inputs of the element 35. The sample signal from the channel passes through all the external device control blocks in the main and each additional chain of 25 external devices However, the signal of the sample is fed to the corresponding buses of these chains in parallel. In this case, it is taken into account that there can be no external devices with the same addresses in the main circuit as well as in the additional 30 chains. If it is necessary to connect an external device at its request, the sampling signal from the channel propagates to the external device chain from which the subscriber demand signal came. When a signal is simultaneously received, the demand from the subscriber is based on the foundation and one of several additional chains of external devices, and if the device operates without priority, the channel sampling signal will first be output to the main chain of external devices. If device operation mode is set to priority35

volume, then in this case, the sampling signal from the channel will be output to that external device chain, the number of which is given at the inputs. Depending on the incoming signals, the device can operate in several modes.

The first mode is the operation of the device initiated by channel 84 from the main 85 or from one of the additional 86 chains of external devices, and the operation of the device in this mode does not depend on the state of the signal at input 66. In this mode, to inputs 5 and 9

signals of the channel address and the sample from the channel respectively arrive, and according to the I / O interface requirement, the address signal from the channel precedes the sample signal from the channel. The signal from the input 5 through the amplifier-receiver 29 is fed to the first input of the element And 42, thereby allowing further passage of the sample signal from the channel, and through the element NOT 39 prohibits the passage of this signal through the element 43. Thus, the sample signal from the channel through the amplifier-receiver 31 and the element I 42 sets the trigger 44 to one state, and through the element NOT 40 removes the signal for setting this trigger to the zero state. The signal from the single output of the trigger 44 through the element OR 41, the first inputs of the elements OR 46 and the amplifiers, transmitters 30 and 50, respectively, enters the main 85 and an additional 86 chains of external devices as a sampling signal from the channel.

The sampling signal from the channel in each chain sequentially bypasses external devices until one of the external devices recognizes its address. At the same time, the propagation of the sampling signal from the channel in the chain where this device is located (for example, in one of the additional ones) stops and a work signal from the subscriber is outputted to one of the inputs 18, which through the corresponding amplifier-receiver 56 and amplifier-transmitter 28 comes from output 6 into the channel. In order to block the passage from the sampling channel from the channel through the AND 43 element after the address signal is removed by the channel, the subscriber’s operation signal through the NOT 38 element enters the third input of the AND 43 element

At the same time, from the main and other additional chains of external devices, where the address is not recognized by I / O devices, input 10 receives a sample signal from the subscriber of the main chain of external devices, and inputs 12, except for one, receive a sample signal from the subscriber additional chains of external devices, which, respectively, through the amplifier-receivers 32 and 34 are fed to the corresponding inputs of the element 35. However,

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The sampling signal from the subscriber will not be sent to the channel, because one of the inputs of element 35 does not receive a sample signal from the subscriber from one of the additional chains due to the output from the subscriber by one of the input / output devices of this chain.

With the end of the exchange, channel 84 removes the sampling signal, which leads to the appearance through the NOT 40 element of the reset signal of the trigger 44, and consequently, to the removal of the sampling in the main and in additional chains of external devices. In the case when none of the I / O devices in the main and additional chains recognize their address, a sample signal from the subscriber will be present at all inputs of the And 35 element, which will result in the output of the And 35 element, which through the OR element 36 and the transmitter amplifier 33 enters the channel as a sampling signal from the subscriber.

The second mode is the work on initiating a subscriber of the main 85 or one of the additional 86 chains of external devices. In this mode, each input 19 receives a demand signal from a subscriber from the corresponding additional chain of external devices, and input 20 receives a demand signal from the subscriber of the main chain, which from the output of the corresponding amplifier receiver 57 and 27 through element 74 of the corresponding block 73 enters setting the trigger 79 in a single state, as well as combining the inputs of the element OR 37 into the mounting OR, is fed through the amplifier / transmitter 26 into the channel as an integrated demand signal from the subscriber. In response, the channel outputs a sampling signal to input 9, which, through the closed contact 61 of the relay, receiver amplifier 31 goes to the corresponding inputs of And 42 and 43 elements and NOT 40 element, the output of which removes the trigger signal 44 and 45 to the zero state. Since the first and third inputs of the And 43 element are high (the absence of additional work signal from the subscriber and the address signal from the channel from the additional chains), the sample signal from the channel passes through the And 43 element and sets to

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state trigger request 45, from the zero output of which, through the OR 78 element of the corresponding block 73, the signal is set to zero state of the trigger 79. At the same time, due to the high level delay, the zero output of the trigger 45 on the delay element 72 requires from the subscriber from the main and additional-Q chains of external devices, through the element 74 of the corresponding block 73, goes to the installation of the trigger 79 in the single state. Further, the demand signal from the subscriber from any point on the external devices (the main or additional will not pass due to the presence of a low level at the output of the delay element 72.JQ

Thus, after the trigger 45 is set to one, channel 84 will serve one of the subscriber demand signals stored on the trigger 79 of the corresponding block 73. However, the order of servicing the stored demand signals from the subscriber depends on the state of the signal on the mode setting bus 66. If the bus 66 is low, then all outputs of the decoder 64 will be low, thereby blocking the signals on the tires 65. Therefore, a low level will be at the outputs

the external device chains specified on the tires 65 are set to high levels, and if the trigger 79 of the corresponding block 73 is in the single state, then the output of one of the elements And 67 appears to be a high level, therefore, a high level will be at the output of the element OR 69, and a low level - on one of the elements is NOT 68. A high level delayed by a delay element 70 causes an OR 69 to form an AND 75 element at the output of the element.

15 in the corresponding block 73 of the reset signal to the zero state of the trigger 79, except for one of the blocks 73, since at the other input of the AND element 75 of this block 73 there will be a low level. Thus, in the 1 st state, the trigger 79 of the demand signal block 73 from the subscriber of that chain of external devices, the number of which is specified on buses 65, remains

25 provides for the issuance of a signal from a single trigger output 45 into a given chain of external devices as a sampling signal from a channel. In any case, if the connection of the external device with the channel for any reason did not occur, then the signal from the output of the AND 77 element of the last block 73 via the OR 36 element and the amplifier-transmitter 33 is fed to

of all elements And 67 and at the output 35 of the OD 1 the sampling signal from the subscriber OR 69. Due to the low level of the signal at the output of the element 70 of the delay, the formation of the reset signal is three, r 79 in each of the blocks 73 through the element 75 does not . Then, the first block 73 interrogated by the single output signal of the flip-flop 45 is delayed by the delay element 71. If the flip-flop 79 of the zero block 73 is in the one state, then from the output of the AND 76 element the triggered request 45 via the OR element 41 and the amplifier transmitter 30 enters the external device chain as a sampling signal from the channel. If the trigger 79 of the zero block 73 is in the zero state, then the signal from the output of the And 77 element polls the next block 73, and so on.

If the bus 66 is high, then on one of the outputs of the decoder 64 in accordance with the code number

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the external device chains specified on the tires 65 are set to high levels, and if the trigger 79 of the corresponding block 73 is in the single state, then the output of one of the elements And 67 is high, therefore the high level will be at the output of the element OR 69 and a low level - on one of the elements NOT 68. A high level delayed by a delay element 70 delays the output of the element OR 69 allows the formation of an output element AND 75

5 in the corresponding block 73 of the reset signal to the zero state of the trigger 79, except for one of the blocks 73, since at the other input of the AND element 75 of this block 73 there will be a low level. Thus, in the 1 st state, the trigger 79 of the demand signal block 73 from the subscriber of that chain of external devices, the number of which is specified on buses 65, remains

5 provides for the issuance of a signal from a single output of a trigger 45 into a given chain of external devices as a sampling signal from a channel. In any case, if the connection of the external device with the channel for any reason did not occur, then the signal from the output of the AND 77 element of the last block 73 through the OR 36 element and the amplifier-transmitter 33 is fed to

that

Claims (3)

1. A device for interfacing an I / O channel with external devices, comprising a channel amplifier unit, the input group of which is a group of device inputs for connecting to the group of information and control outputs of an I / O channel and a group of information and control inputs of an external device , subscriber unit amplifiers, the first group of outputs of which is a group of device outputs for connecting to a group of information and control inputs of an I / O channel and a group of information and control outputs of an external device block, a session resolution resolver, first inputs and outputs, second inputs and the output of which are the corresponding inputs and outputs of the device for connecting the output and input of the sample signal of the I / O channel and the output and input of the sample signal of the block of external devices; combo, a group of OR elements, the first inputs of which are connected to the third output of the session resolution block, and the second outputs, respectively, to the outputs from the first by N subscriber demand signal storage units, a group of transmitters, whose inputs are connected to the outputs of the corresponding OR elements of the group, and the outputs are corresponding to the group of outputs of the device for connecting the input to the signals of the block selection of additional external devices of the group, the group of amplifier-receivers, the outputs of which are connected to the group of inputs of the block p Session assignments, and the inputs are a group of device inputs for connecting to the signal outputs of a sample block of additional external devices of the group, the group of outputs of the channel amplifier unit and the group of inputs of the trunk amplifier unit are the corresponding groups of inputs and inputs for connecting to the information management the input inputs and outputs of the additional external device blocks; the output of the channel amplifier unit is connected to the third input of the session resolution resolver; the fourth input and output which are connected respectively to the output of the subscriber amplifiers block and the read enable input of the zero block of the group subscriber demand signal, the read enable input of the i-ro block of the subscriber group's demand signal (i 1, N) is connected to the first output (il) of the block storing the group's subscriber demand signal, the first output of the N-ro group storing the signal of the group subscriber demand signal is connected to the fifth part of the session resolution block, the fifth output connected to the reset inputs of the third signal storing unit Hovhan subscriber groups, the first information input of i-ro block storage requirements local signal group is coupled to a second group of subscriber unit output amplifiers, characterized in that, in order to expand the class solvable tasks by providing the possibility of operatively changing the order of servicing the block of external devices and blocks of additional external devices, a priority block is entered in it consisting of a decoder, a group of inputs and an input which are respectively a group of inputs for specifying priority and an input for setting a device mode, a group of elements And, a group of elements NOT, an element OR, and a delay element, and the group of outputs of the decoder is connected to the first inputs of elements AND groups, the outputs of which are connected to the inputs of elements H E groups and groups of inputs of the OR element, the output connected via the delay element with the first inputs of the recording enablement of the signal storage units of the subscriber's demand signal group, the second information inputs and the third outputs of which are connected respectively to the outputs of the NOT elements of the group and the second inputs of the AND elements of the group, the second recording resolution inputs The signal storage units of the subscriber's demand group are connected to the net output of the session resolution resolver, the seventh output and the sixth input of which are connected respectively to the group in outputs of the subscriber amplifiers block and the second output of the zero block of signal storage of the subscriber's demand signal, the first information input connected to the input of the subscriber amplifiers block and the eighth output of the session resolution resolver whose ninth output is connected to the third inputs of the And group, and the seventh input is the device input for connecting the I / O channel subscriber demand signal to the input. 2. The device according to claim 1, wherein the session resolution resolving unit contains three input amplifiers, two output amplifiers, two triggers, three AND elements, two OR elements, three elements NOT, two delay elements and three switching elements, the inputs of the first and second input amplifiers are connected respectively through normally closed contacts of the first and second switching elements to the first and second inputs of the unit, the outputs of the first and second output amplifiers are connected respectively to the second and first outputs of the unit and through the normally closed contacts of the first and second switching elements with the first and second inputs of the block, the seventh input of the block through the normally closed contact of the third switching element is connected to the seventh output of the block, the seventh input of the block through the normally open contact of the third switching input amplifier, the output of which is the eighth output block, the outputs of the first and second elements OR are connected respectively to the inputs of the second and first output amplifiers, and the first inputs to the fifth and third To the fourth block inputs, the output of the second output amplifier is connected to the input of the first element AND, whose input group is the group of inputs of the block, and the output is connected to the second input of the first OR element, the third input of which is connected to the output of the first delay element and the fourth output of the block, the installation inputs The first and second triggers are connected respectively to the outputs of the second and third elements AND, the inputs of the first and second elements are NOT connected respectively to the fourth and third inputs of the unit, the first inputs of the second and third el ments and connected to the output of the first input amplifier and through a third NOT elment to reset inputs of the first and second flip-flops, a direct output of the first flip-flop coupled to a second input of the second OR gate and the third output block, the forward output vtorog 0 the trigger is connected to the input of the first delay element and the ninth output of the block, the inverse output of the second trigger is connected to the fifth output of the block and through the second delay element to the sixth output of the block, the second and third inputs of the third element AND are connected respectively to the outputs of the first and second elements NOT, the second input of the second element And is connected to the third input of the block. 3. The device according to claim 1, of which is each such that each block of storing the signal of the demand of the subscriber of the group contains a trigger, four AND elements and an OR element, with the first inputs of the first and second elements AND The first and second inputs of the write resolution of the block, respectively, and the second inputs of the first and second information inputs of the block, the outputs of the third and fourth And elements, respectively, are the first and second outputs of the block, and the first inputs are connected to the read enable input of the block, the output of the first element And and the reset input of the block are connected respectively to the first and second inputs of the OR element, the output connected to the reset input of the trigger, the installation input of which is connected to the output of the second element And, the second inputs of the third and fourth elements And are connected respectively to the inverse and direct outputs of the trigger, direct my output of which is the third output of the block. 0 five 0 five