SU1104497A1 - Multichannel device for linking subcribers with bus - Google Patents

Abstract

MULTI-CHANNEL DEVICE FOR CONNECTING SUBSCRIBERS TO THE MAIN, each channel has three AND elements, an amplifier-receiver, an output connected to the first input of the first element OR whose output is connected to the first input of the first element AND, the output connected to the information input of the amplifier-transmitter, and the second the input to the first input of the second element AND, the output of the second element OR is connected to the third input of the first element AND and the second input of the second element AND, characterized in that, in order to increase speed devices, a switch, a trigger, a third OR element and three AND elements are entered into each of its channels, the first input and output of the switch of the th channel (i 2, M) are connected respectively to the second output and input of the switch of the i -1th channel, the first the input and output of the first channel switch are respectively the input of the sampling signal and the output of the device sampling signal, the second output of the M-th channel switch is connected to the second switch input of the same channel, on the i-th channel the third output and switch input are connected The output of the first element AND is connected to the second input of the first element OR, the first inputs of the second-fifth elements And are connected to the i-th input of the device enable signal and the zero input of the trigger, the outputs of the third, fourth, and fifth elements of AND are connected respectively to the first, second, and third inputs (L will give the third element OR, and the second. inputs - respectively to the output of the amplifier-receiver, the output of the third element OR and the i -th input of the device address identification signal, a single trigger input is connected to the output of the third element OR, and the output - with the h-output signal of time 4; from the device connection decision and the nepBbiM input of the sixth And element, the second and third inputs of which are the 1st inputs of the subscriber non-operation signal and the no subscriber demand signal or comparison of the device address, and the output is connected to the first input of the second OR element, the second input of which is It is the 1st input of the autonomous operation signal of the device, and the third input is connected to the output of the second And element and the t-th output signal of the device sample distribution.

Description

The invention relates to computing and can be used to interface the equipment of computer systems with a data communication line. A device for connecting subscribers to a trunk is known, comprising a matching unit, amplifiers, AND and OR elements, a sampling node. The sample line passes through the entire device in series, forming a closed loop, the beginning and end of which is connected to the computer. Using a switching node, the device is connected to the forward or backward branches of this loop, which determines its priority in trunk l. The closest to the invention in its technical essence is a multichannel device for connecting subscribers to a common trunk, which contains a matching level block a for each channel, a comparison circuit, three AND elements, an NOT element, an address register, two OR elements, five receiver amplifiers and three transmitter amplifiers, in each channel the first input of the comparison circuit through the first amplifier-receiver is connected to the address output of the level matching unit, the second inputs to the output of the address register, and the output to the first input of the first el And through the element NOT with the first inputs of the second and third elements AND, the second inputs of the first and second elements AND are connected to the output of the first element OR, the output of the second element OR is connected to the second input of the third and third input of the first elements AND, the first input of the first element OR through the first amplifier, the receiver is connected to the output of the sampling block of the level matching unit; the first input of the first element OR of each link is connected via the second amplifier-receiver of the same channel to the output of the first amplifier-transmitter before About the channel input of the first element I of the previous channel connected to the extrude, the output of the first element And the last channel through the first amplifier-transmitter is connected to the sample return input of the level matching unit, the output of the second element And each channel is connected through the amplifier-transducer with the signal input the logical connection of the level matching unit, the output of the third element AND of each channel through the amplifier-transmitter to the input of the third amplifier receiver of the previous channel connected to the first the input of the second element And the previous channel connected to the first input of the second element And the previous channel, the second inputs of the first and second elements OR through the fourth and fifth amplifier-receivers are connected respectively to the first and second inputs of the sampling control unit matching the level 2. The disadvantage of the known device is in the low speed of the device and limited functionality, excluding the possibility of switching off individual channels without disrupting the operation of the device. The aim of the invention is to increase the speed of the device. The goal is achieved by the fact that in a device containing in each channel three elements AND, an amplifier-receiver, an output connected to the first input of the first element OR, the output of which is connected to the first input of the first element AND, the output connected to the information input of the amplifier-transmitter, and the second input is to the first input of the second element AND, the output of the second element IL is connected to the third input of the first element AND and the second input of the second element AND, a switch, a trigger, a third element OR and three elements are entered into the channel nA And, the first input and output of the 1st channel switch (, M) are connected respectively to the second output and input of the switch of the i -th channel, the first input and output of the first channel switch are the input signal of the sample signal and the output signal of the device sample, the second the switch output of the M-th channel is connected to the second input of the switch of the same channel, on the 1st channel the third output and input of the switch are connected respectively to the input of the receiver amplifier and the output of the transmitter amplifier that controls the connected input to the fourth output of the switch, the output of the first element I is connected to the second output of the first IZH element, the first inputs of the second to fifth elements I are connected to the i-th input of the device enable signal and the zero input of the trigger, the outputs of the third, fourth and fifth elements And are connected respectively to the first, second and third inputs of the third element OR, and the second inputs respectively to the output of the amplifier receiver, the output of the third element OR to the input signal of the device address identification identification signal, the single input of the trigger connected to the output of the third element OR, and the output to the t-th output of the device connection enable signal and the first input of the sixth And element, the second and third inputs of which are the 1st inputs of the subscriber’s non-operation signal and the subscriber’s no-demand signal or comparison device address, and the output is connected to the first input of the second OR element, the second input of which is the i-th input of the autonomous operation signal of the device, and the third input is connected to the output of the second And element and the -th output of the sample distribution signal y troystva.

Figure 1 shows the structural diagram of a multi-channel device and a functional diagram of one of the channels; FIG. 2 is a switch diagram.

The multichannel device contains (Fig. 1) channels 1-4, and in each channel a switch 5, a node 6 for matching amplifier-receiver 7, amplifier-transmitter 8, elements AND 9-J4, first, third and second elements OR; 15-17 and a trigger 18. Figure 1 also shows the connection of channels 1-4 in the system and denotes the first inputs 19, the second outputs 20 and the inputs 21 and the first outputs 22 of the channels, as well as the communication lines to the subscriber of one channel: input 23 address identification signal, sample enable signal input 24, connection enable signal output 25, subscriber absent signal input 26, no subscriber demand signal input 27 or address comparison, autonomous operation input 28, sample distribution signal output 29.

Switch 5 (figure 2) contains the switching element 30, group

P1-RZ relay contacts (relay windings not shown).

The device operates in the following 5 ways.

In the initial state, at inputs 19, 21, 23, and 24, there are logical zero levels. At the input 28, in the operation mode, the system contains a zero-level logical zero, and in the autonomous mode, the level of the Logical unit. At inputs 26 and 27, in the initial state and in the autonomous mode, there are levels of logic unit. The trigger 18 is reset to zero by the logic zero level at input 24, therefore, at output 25, as well as at logic outputs zero, at outputs 20, 22, 29. In switch-5 -5 (FIG. 2), the position of the P1-RZ contacts of the relay is shown for the case when the power is off and the position is re-. key element 30 - for the case when the device is connected to

5 straight branch of the sample loop. In this case (when the power is turned off), the priority signal of the sample, inputted at input 19 of the device, passes through the upper contact group of the switching element -30, the closed contacts P1, the middle contact group of the switching element 30 and further to the output 20. The back sampling signal arriving

 to the input 21, passes through the lower group of contacts of the switching element 30 to the output 22. Thus, the switch 5 with the channel power off provides

Q is a detour to the priority sample signal, i.e. A disabled channel does not affect the operation of other channels. When the power is on, the RGi RZ contacts are open, and the P2 contacts are closed, you. In this case, the sampling signal from input 19 through the upper contact group of the switching element 30 and the closed contacts P2 enter the input of the amplifier receiver 7, and the sampling signal from the output of the transmitter amplifier 8 through the middle contact group of the switching element 30 to the output 20. Signal path back sampling is not iamens. RZ contacts serve dp

connections to the control input of the amplifier-transmitter 8 of the level of logical zero when switching the power supply of the channel to eliminate the interference signals and the sample line. Changing the position of the switching element 30 from the top to the bottom will change the channel priority, since in this case it will be connected to the reverse branch of the loop of the sample line. In this case, a return signal is sent to the input of the amplifier-receiver 7 of the channel, and from the output of the transmitter-amplifier 8 of the channel, the signal is output to output 22. In the future, the channels (for example, channel 2) are considered in the system operation mode (output 28 zero) when connected to the forward branch of the loop of the sample line (switching element 30 is in the upper position). Connecting the subscriber to the trunk through channel 2 can be realized both on the initiative of the computer and at the request of the subscriber. In the first case, the computer brings the subscriber’s address to the information buses of the trunk, accompanied by an address identification signal. This information is available to all abonents. The subscriber, having received the address identification signal, transmits it to the input 23 of his channel 2, where he arrives at the input of the element I 13 and compares the address given by the computer to his address. In the case of a comparison of addresses, the subscriber blocks AND 14, giving a logic zero level to input 27. If the address is not recognized, then at output 27 the level of the logical unit remains. After a period of time sufficient for the subscriber to recognize his / her address, the computer generates the sampling signals and the sampling resolution. The sample enable signal is available to all subscribers simultaneously. The subscriber, this signal, transmits it to the input 24. Here it goes to the inputs of trigger 18 and to the outputs of the And 9-13 elements. The sampling signal passes through all the channels 1-4 sequentially depending on their priority. It goes to the input 19 of the channel and then through the switch 5 to the input of the amplifier-receiver 7, from the output of which this signal goes to the input of the And 11 element, and through the OR element 15 to the input element And 9. Thus, if channel 2 has the highest priority, then the signals of the sample and the resolution of the sample arrive at it simultaneously with 7 but. In this case, elements 11 and 13 are triggered, and from their outputs, signals in the form of levels of a logical unit are passed through an element OR 16 to an input of an element 12, which also triggers and outputs the level of a logical unit to the input of an element OR 16, thereby ensuring self-blocking These signals identify or short-term disappearance of the sampling signal when connecting, disconnecting or changing the priority at this time in other channels 1,3,4. If channel 2 does not have the highest priority, then the sampling resolution resolution will come earlier than the sampling signal. In this case, channel 2 will only trigger an AND 13 element, the signal from the output of which through the OR 16 element arrive at the input of the AND 12 element. From the output of the AND 12 element, the signal in the form of a logic level will arrive at the input of the OR 16 element, as before. In both cases, the signal from the output of the element OR 16 also goes to the single input of the trigger 18, thus transferring it to the single state. From the output of the trigger 18, the connection permission signal goes to output 23 and further to the subscriber, as well as to the input of the element 14. Thus, when subscribers are connected at the initiative of the computer, the connection permission signal is transmitted to all subscribers at the same time. If the subscriber has identified his address, the AND 14 element is closed and blocks the signal from the trigger output 18. After receiving the connection enable signal from output 25, the subscriber enters the subscriber's work signal into the trunk and simultaneously inverts this signal to input 26 and further to the input of AND 14, block this item at another entrance. In response to the work signal of the subscriber, the computer removes the address identification signal, as a result of which the subscriber removes the signal from input 23 and sets the level of the logical unit at input 27. However, the state of channel 2 will not change, since AND 14 is blocked by the logic zero level at input 26 And the closure of the element And 13 does not affect the input signal of the element OR 16, since its input will be the level of the logical unit from the output of the element 12. Next, the subscriber exchanges data with a computer through a common line in accordance with the specified algorithm. the address is not recognized by the customer, then the logical unit level remains at the input 27 and the signal from the output of the trigger 18 passes through the AND 14 element and then goes through the OR 17 element to the inputs of the AND 9 and 10 elements. The AND 10 element will also trigger at its output logical unit, coming through the element OR 17 back to the input element And 10, which prevents its closure when removing signals from other inputs of the element OR 7, the signal from the output of the element And 10 also goes to output 29 and further to the subscriber, thereby signaling the subscriber that the enable signal is connected tim output 25 subscriber rejected and can no longer be re-used until they obtain this signa la even when the internal state of the subscriber. In the presence of a sampling signal (this signal, depending on the priority of channel 2, the sampling resolution signal may arrive much later) at the output of the element 9, the propagation signal appears. There is no sampling, which is fed to the input of the amplifier-transmitter 8 and then through switch 5 to the input 20. In addition, this signal from the output of the And 9 element duplicates the sampling signal in the event of its short-term disappearances when other devices are turned on, turned off or changed. If no subscriber recognizes his address, then the sampling signal, having passed through all the devices, will be returned to the computer by a reverse sampling signal, which signals the absence of the subscriber with this address. Thus, in the process of connecting the subscriber at the initiative of the computer, the identification signals and the sampling resolution are analyzed on each channel in each channel. If they are simultaneously present, the subscriber will enable the connection signal, not waiting for the sample to enter the channel. As a result, the connection time of any subscriber to the common highway on the initiative of a computer will be the same for all subscribers and equal to the subscriber connection time with the highest priority. In addition, the time interval between the back sampling signal returning to the computer in the absence of a subscriber with a given address, and the sampling signal, b (by the computer, due to the fact that in channels 2,3 and 4 this signal from the amplifier-receiver 7 through the element OR 15 arrives at the element AND 8, the other inputs of which by this time will already have the level of logical unit. As a result, the distribution signal of the sample arrives at the input of the element AND 9 through the amplifier-transmitter 8 and the switch 5 to the output 20 and further to the input 19 next channel (or to input 21 in channel 4, connected last to the forward branch of the loop of the sample line). This path is shorter than the full path of the sample signal through the channel (when the address is not compared): from amplifier - receiver 7 through AND 11, OR 16 elements trigger input 18 and further from its output through the elements AND 14, OR 17, and 9 to the input of the amplifier of the transmitter 8. Thus, in all subsequent channels (except the first, where the sample signal passes through the full path), the delay of the sample signal is less. Let us now consider the operation of the device when the subscriber is connected to the common trunk at the request of the subscriber. In this case, the subscriber exposes the subscriber's demand signal in the common highway and simultaneously sets the logical zero level at the input 27, blocking the AND element, which prohibits the issuance of a sample distribution signal. In response to the demand of the subscriber, the computer picks up the sampling and resolution signals that are fed into the device as described. Since in this case the address identification signal at input 23 is absent, the And 13 element will be closed and the trigger 18 can be brought into one state if there are only both sample and resolution signals at the inputs of the And 11 element, which are output from the And 11 element through the element OR 16 is fed to the input of the trigger 18 and to the input of the element AND 12 and then again to the input of the element OR 16 to eliminate the momentary disappearance of the sampling signal. From the single output of the trigger 18, the connection resolution signal is distributed in the same way as when connected by a computer: if there is a subscriber's demand for connection, the AND 14 element is closed, and at the connection permission signal, the subscriber activates the subscriber's signal mu in it algorithm. If there is no subscriber demand, then the connection enable signal through the AND 14 element, the OR 17 element, the AND 9 element, the amplifier-transmitter 8, the switch 5, the output 20 is output by the distribution signal of the sample to the input of the next priority channel. In addition, from the output of the element I.PI 17, through the element 10 to the output 29, a signal is sent to the subscriber that the subscriber has refused to connect to the trunk and the next link | A thinnest connection is possible only when the connection permission signal is received again. Consequently, the reduction of the subscriber connection time by ini-. the computer initiative does not introduce any additional delays in connecting on-demand subscribers. Thus, the multichannel device provides a speed increase by reducing the subscriber connection time initiated by the computer and the time of returning the sample signal to the computer in the absence of the subscriber with the specified address without changing the algorithm of the subscriber with a common highway. Since, for example, in the EC system of a computer in a subscriber connection operation, a processor is occupied by a computer, both time gains can not only increase the total bandwidth, but also reduce the CPU time required for initializing I / O operations, which leads to an increase in its performance.

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Claims (2)

MULTI-CHANNEL DEVICE FOR CONNECTING SUBSCRIBERS TO THE MASTERLINE, containing three AND elements in each channel, an amplifier-receiver connected to the first input of the first OR element, the output of which is connected to the first input of the first AND element, the output connected to the information input of the amplifier-transmitter, and the second input - to the first input of the second AND element, the output of the second OR element is connected to the third input of the first AND element and the second input of the second AND element, characterized in that, in order to improve the performance of the device two, a switch, a trigger, a third OR element, and three AND elements are introduced into each of its channels, and the first input and output of the ί-th channel switch (i = 2, M) are connected respectively with the SECOND IN1 input and the input of the switch ί of the 1st channel, the first input and output of the switch of the first channel are respectively the input of the sample signal and the output of the sample signal of the device, the second output of the switch of the Mth channel is connected to the second input of the switch of the same channel, in the t-th channel, the third output and input of the switch are connected respectively to the input of the receiver amplifier and the output of the amplifier-transmitter, controlling the input of the switch connected to the fourth output, the output of the first element And connected to the second input of the first element OR, the first inputs of the second to fifth elements AND are connected to the <-th input of the device enable signal and the zero trigger input, the outputs of the third, fourth and fifth elements AND are connected respectively, § but to the first, second and third the inputs of the third element OR, and the second. inputs - respectively, to the output of the amplifier-receiver, the output of the third OR element and the 1st input of the device address identification signal, the trigger single input is connected to the output of the third OR element, and the output is the ci-output of the device connection enable signal and the first input of the sixth AND element , the second and third inputs of which are the 1st inputs of the signal of the subscriber’s absence of work and the signal of the absence of the subscriber’s demand or comparison of the device address, and the output is connected to the first input of the second OR element, the second input of which is It is the first input of the autonomous operation signal of the device, and the third input is connected to the output of the second AND element and the t-th output of the distribution signal of the device sample. SU_., - 1104497