SU684536A1 - Multichannel device for connecting data sources to common channel - Google Patents

Description

one

The invention relates to the optimization technology, in particular, to devices for connecting several sources of information to a common trunk. It can be used in data processing systems to control access to a shared resource.

A multichannel device is known for connecting information sources to a common trunk, which contains a priority trigger in each channel, a priority control trigger, an interrogation trigger, a trunk busy trigger, a driver, six transistors, twenty AND elements, and three OR elements.

The disadvantage of this device is a large amount of equipment.

A multi-channel device is known for connecting information sources to the C2 trunk, which contains a request trigger, a resolution trigger, a clock impulse generator, a query memory trigger, one two-input AND element and two multiple-input I. Elements in each channel.

The drawback of the device is low reliability due to the absence of failure detection circuits.

Claims (3)

The closest to the technical essence and the achieved result is the multichannel device for connecting information sources to the trunk trunk (3J, containing in each channel the polling signal generator, three switching elements, the first trigger, two elements OR, the first element AND, the NOT element. The first output of the first switching element of the channel is connected to the first inputs of the channel interrogation signal generator and the first element AND channel, the first output of the second switching element of the channel It is connected to the second input of the polling signal generator JFanal and through the channel NOT element to the second input of the first channel element I. The first input and output of the first OR element of the channel are connected respectively to the output of the first AND element of the channel and the first input of the third switching element of the channel, the first Output of the third the channel switching element is connected to the input of the first channel trigger, the second outputs of the first and third channel switching elements and the output of the first channel trigger via the second OR element of the channel are connected with the first input of the first switching element after the blowing channel. The output of the second element OR of the last channel is connected to the first input of the first switching element of the first channel, the second output of the second switching element of the channel is connected to the first input of the second switching element on the next channel, the second inputs of the first and second switching elements of the channel are connected to the corresponding control input of the device. The / Third Inputs of the channel interrogation signal generators are connected to the generalized request input of the device, the first input of the second switching element of the first channel is: the device starting input. The request sources in this device are serviced sequentially around the ring, and the time of passage of the ring interrogation signal in the channel without a request for service is determined only by the response time of the active elements in the distribution circuit of the signal. However, the presence of transients in the active elements of the circuit and the final speed of propagation of the ring interrogation signal determine the probability of the occurrence of malfunctioning of the channels of the device. Thus, for example, in a ring circuit, more than one ring interrogation signal may occur if the time when an application for connection to the highway arrives coincides with the moment this signal passes through the switch circuits. The conditions that determine the probability of two or more information sources entering the trunk are usually excluded by delay elements, the duration of which overlaps with the switching time of the round-trip signal passing circuits. Contradictions arising from the choice of the delay value are resolved either due to the speed of the line, as an increase in the delay: leads to a decrease in its throughput, or due to the reliability of the information in the line, since a decrease in the delay leads to a decrease in the reliability of the device. In practice, these contradictions are often insoluble, especially with a large number of information sources and a high intensity of information flows. The purpose of the invention is to increase speed and reliability. The goal is achieved by entering into the device. In each channel, the second and third elements are AND, the second and third triggers, the third element OR, and the delay element. At the same time, the output of the second element AND channel and the output of the second channel trigger via the third element OR of the channel are connected to the first input of the third element AND channel and the second input of the second element AND the subsequent channel. The output of the third element And the channel through the third channel trigger is connected to the second input of the third switching element of the channel. The output of the channel polling signal generator is connected to the input of the second channel trigger, the output of the second channel trigger is connected via the delay element of the channel to the second input of the first OR element. The output of the channel element NOT is connected to the second input of the second element AND channel, the output of the third element OR of the last channel is connected to the first input of the second element AND of the first channel, and the second inputs of the third element AND channels are connected to the corresponding request g-strokes of the device. The block diagram of the device is shown in the drawing. A multichannel device for connecting information sources to a common highway contains channels 1-3, each of which is made up of the first 4 and Second 5 switching elements, the first 6, the second 7 and the third 8 triggers, delay element 9, the polling signal generator 1O, and the third the switching element 11, the first element OR 12, the first element AND 13, the element NOT 14, the second element OR 15, the third element OR 16, the Second 17 and the third 18 elements and. The device also contains request inputs 19-21, a generalized request input 22, control inputs 23-25, trigger input 26, inputs 2 28 channels, outputs 29, 31 channels. The device works as follows. The signal at input 26 of channel 1 is with logical unit 1. This signal is fed to the first output of switching element 5 in channel 1 if a signal is present at the input 23 of channel 1. Otherwise, logical 1 passes to the second Output of switching element 5 and via Output 31 enters input 26 of the next channel 2. The presence of a signal at input 23 indicates that this channel is included in the complex of channels organizing the connection of information sources to the common highway. The logical 1 on the first output of the switching element 5 will also be present only in one of the channels, namely, the one in which logical 1 is present at input 26, and the channel enable signal at the input 23 is complex. The presence of a signal at the first output of the switching element 5 is one of the conditions for generating a ring scan signal in the channel. Consequently, only one channel can be generated Ring-polling signal. Input 22 receives signals from the station to the exit to the highway from all sources of information. At input 19, a signal is received for a connection from one source of information. The ring interrogation signal is generated by the 1O generator in the presence of a signal from the wok on Input 22 (the third input of the generator) and a signal on the first output of the switching element 5 (the second input of the generator). The latching signal generated by the trigger 7 via the OR element 16 arrives at the AND 18 element and, at the same time, at output 30 to the input 28 is the second channel 2. From the input 28 through the open element 17 and the OR 16 element, the lock signal of the request arrives at the element 18 and Vrsod 30 channel 2, etc. through all. Channels to channel 28 where the signal; latch fixings attenuate at the closed element AND 17. A channel latch signal passing through the internal circuits (input 6 28 - element AND 17 - element OR 16 - output 30) And 18 opens in each channel, allowing the signal to pass availability of a connection to the common line, if it is currently at input 19, on trigger 8. Trigger 8 controls the switching element 11. The signal of the inner ring interrogation goes to the switching element 11 of the striger 7 through the delay element 9 and the OR element 12. Thus, the moment the switching element 11 and the moment of its passage through the inner annular chains interrogation signal separated in time by a delay amount determined by the delay element 9 and the overlying vread transients in akchchshnyh switching member cells. This eliminates the possibility of signals at both Outputs of the switching element 11, and consequently, the output to the main line of two sources of information. If there are applications for connection to the common highway in trigger 8, the ring interrogation signal enters trigger 6, is delayed by the time determined by the Information Issue Cycle in the trunk, and through the OR 15 element enters. output 29 of channel 1 (the entrance of the next channel in the ring). In the absence of an application in trigger 8, the ring interrogation signal is output to channel 29 via the OR 15 element, and the trigger 6 is mine. The control signal of the same name as the input 23 signal allows the ring interrogation signal from input 27 to pass through the switching element 4 or to the first the input of the generator 1O and the element AND 13, or the third input of the element OR 15. In the first case, the ring interrogation signal or is regenerated (if in the generator Yu there are conditions for generating the ring interrogation signal); or enters output 29 through an AND 13 element, an OR 12 element, a switching element 11 and an OR 15 element (if a logical O is present at the first output of the switching element 5). In the second case, the ring interrogation signal arrives at the output 29 of the channel through the OR 15 element (through the third IN input of the OR 15 element). The invention provides an increase in speed (accelerated exchange of legal information on the trunk line to be expressed by the formula: - coefficient of speed increase; - frequency of information exchange on the highway when using the invention; - frequency of information exchange on the highway when using the known device; t, -t Time of provision of the highway tj is the delay time of the ring interrogation signal, which compensates for the presence of transient processes in the switching elements; n is the number of information sources, Adjusted to a common highway. Substituting the above notation, / 1 h, D ta to formula (1) and entering a parameter characterizing the delay of the ring interrogation signal, we obtain: Usually for stable operation, the circuits are chosen .7ii, p. (- the rise time of the pulse front). From the formula (2) it can be seen that the invention has the greatest effect at frequencies close to the maximum possible (), and with a sufficiently large number of information sources. So with P, 35 (tj 0.7C "and t and with h8, the frequency of information exchange in the trunk can be increased in comparison with the known device by 3 times; In addition, the presence of a third trigger makes it possible to divide the response time of the switching element and pacnp country travel time by its internal loop polling signal. This eliminates the likelihood of simultaneously 1 × output to the 84536 trunk from more than one source, which increases the reliability of information exchange on the trunk. A multichannel device for connecting information sources to a common trunk containing, in each channel, a polling signal generator, three switching elements, a first trigger, two OR elements, a first AND element, a NOT element, the first output of the first switching element of the channel connected to the first generator inputs the channel interrogation signal and the first element AND channel, the first output of the second channel switching element is connected to the second input of the channel interrogation signal generator and through the element NOT canip - with the second input of the first element AND channel, the first input and output of the first element OR channel connected respectively to the output of the first element AND channel and the first input of the third switching element of the channel, the first output of the third switching element i channel connected to the input of the first channel trigger, the second outputs of the first and the third channel switching elements and the output of the first. channel trigger through the second element OR channel connected to the first input of the first switching element of the subsequent channel, the output of the second element OR of the last channel is connected to the first input of the first switching element of the first channel, the second output of the second switching element of the channel is connected to the first Input of the second switching element of the subsequent channel, second the inputs of the first second switching elements of the channel are connected to the corresponding control input of the device, the third inputs of the generator The polling signal selectors of the channels are connected to a generalized device request input, the first input of the second switching element of the first channel is the trigger input of the device, in order to improve the speed and reliability of each second and third elements in each channel, the second to the third triggers, the third OR element and the delay element, with the code of the second element AND channel and the output of the second channel trigger through the third element OR channel connected to the first input of the third element AND channel and the second input BTopotxj of the AND element of the subsequent channel, the output of the third element AND channel via the third channel trigger is connected to the second input of the third switching element of the channel, the output of the signal generator is opro:; and the channel is connected to the input of the second trigger, the output of the second channel trigger is connected to the second input of the first element OR channel, the output of the element NOT channel connected to the second input of the second element AND channel, the output of the third element GO OR the last channel soy. dinene with the first input of the second element And the first channel, and the second inputs of the third elements And channels connected to the corresponding inquiry inputs of the device. Sources of information taken into account during the examination 1. USSR author's certificate No. 317О64, cl. G OBT 9/19 1971. 2. Authors certificate of the USSR. No. 476566, class G 06T 13/00, G 06f9 / 18, 3. USSR Author's Certificate No. 394789, CLR 9/18, GO6f 3/04, 1973.