RU1797117C - Multichannel device for connection of subscribers to common trunk - Google Patents

Abstract

The invention relates to the field of computing and can be used in multi-machine computing systems and local area networks to control decentralized access to a common trunk. The purpose of the invention is to increase productivity by allocating time-varying intervals for transmitting information and for arbitration. The device contains K (K is the number of subscribers) channels, each of which contains three counters, five triggers, a counting trigger, eight AND elements, an OR element, and a 2-OR element. 1 ill.

Description

The invention relates to computing and can be used in multi-machine computing systems and local area networks to control decentralized access to a common trunk.

A device is known for connecting an information source to a common trunk, comprising two counters, two triggers, AND, OR, NOT elements, however, it is characterized by a low throughput of the common trunk.

The closest in technical essence to the claimed invention is a device for connecting subscribers to a common trunk, however, it is characterized by low productivity.

The purpose of the invention is to increase productivity by allocating time-varying intervals for transmitting information and for arbitration.

The essence of the invention is that in order to increase the throughput of the trunk during the preparation of the next word by the subscriber who has captured the trunk, an additional interval is allocated, which is used to transmit words from another subscriber who has captured the additional interval as a result of arbitration. The interval count is set asynchronously with respect to the moment of completion of the decentralized arbitration procedure, the duration of which is not constant.

Structural channel diagram of the device shown in the drawing.

The channel of the device contains counters 1-3, triggers 5-9, counting trigger 10, elements 11-17. OR 18, 2I-IPI 19, common line 20, permission output for transmitting information of channel 21. Request input 22. Request withdrawal input 23, code input 24, clock input 25,

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The device operates as follows.

The subscriber enters the request to capture the trunk into trigger 4 by the signal from input 22. As a result of the periodic installation of counters 1, their transfer signals for different channels are generated at different times, the installation of counters 1 is carried out according to the transfer signals of counters 2, 3. When the counter transfer signal is generated 1, if the subscriber of the corresponding channel requires the capture of the trunk (1 in trigger 4), if this subscriber has not previously captured the trunk (O in trigger 5, 6) and if at 1 (O in trigger 10 in trigger 7 (8) O) t. e. the interval specified by the trigger 10 is not taken - then, according to the signal at the output of the element And 11, (12) 1 is recorded in the trigger 5 (6). In this case, the subscriber receives an information transmission enable signal. The first start bit of the first word records 1 in triggers 9.

In addition, at 1 (O) in trigger 10, a signal from the output of element And 14 (15) is written to trigger 7 (8) 1, thereby fixing the occupancy of the corresponding interval. When writing 1 to trigger 9, the signal is taken from the counter 3 setting output and it starts counting down the interval necessary for transmitting a word (frame), this ensures asynchronous counting of the transmission interval, regardless of the duration of the arbitration procedure. After completion of the transmission interval by the transfer signal of counter 3, trigger 9 is reset and the state of trigger 10 changes. When writing to trigger 10, if the corresponding interval is busy, i.e. in trigger. 7 (8) 1, the arbitration procedure is blocked, because the transfer signal of the counter 3 is blocked by the element And 11 (12). At the same time, in the channel that has captured the corresponding interval and contains 1 in the trigger 5 (6) at the output 21, a transmission enable signal is generated for the next prepared word (frame). If the interval determined by the TO trigger is free, then the arbitration procedure described above is implemented. If data is not transmitted during the maintenance time, after the transfer of the maintenance trigger by the counter 2, a transfer signal is generated, because its counting mode is unlocked at 0, in trigger 9, set by the transfer signal of counter 3. If transmission starts before the countdown by counter 2 of the TO interval, then trigger 9 is set to 1 by the start pulse of the transmitted word, and a lock signal is received at the input of counter 2 billing and resetting. The signal transfer counter 2 is a record of O in

trigger 7 (8) at the 1st () state of trigger 10. On the trailing edge of the transfer signal of counter 2, the state of trigger 10 changes. After the front packet, by applying a signal

O is written to input 23 in trigger 4, as a result of which O is recorded in triggers 5, b of the channel. in the corresponding transmission interval does not occur according to the transfer signal of the counters 2 to the trigger 7 (8),

Claims (1)

depending on the state of the trigger 10, O is recorded, which means that the state is free in all channels. SUMMARY OF THE INVENTION A multi-channel device for connecting subscribers to a common trunk, comprising K (K is the number of subscribers) channels, each of which contains first to third counters, first to fourth triggers, first and second AND elements, and 0 OR element, characterized in that, in order to increase productivity by highlighting intervals of different durations for transmitting information and for arbitration, each channel 5 further comprises a fifth and sixth flip-flop, a counting flip-flop, third to seventh AND elements, and an II-OR element, the output of which is connected to an output of a channel information transmission permission 0 device, the sync input of which is connected to the counting inputs from the first to the third counters, the input of the request, the input for removing the request and the code input of the channel of the device are connected respectively to the inputs of the installation in 5 1 and in O of the first trigger and with the information input of the first counter, the overflow output of which is connected to the first inputs of the first and second elements And, the outputs of which are connected respectively 0 with the sync inputs of the second and third triggers, the receiving outputs of which are connected respectively to the first and second inputs of the 2-OR element, the output of the first trigger is connected to the inputs of the installation in O of the second 5. and the third trigger, the inverse outputs of which are connected respectively to the first and second inputs of the third element And, the output of which is connected to the second inputs of the first and second elements And, the outputs of the fourth and fifth elements AND are connected respectively to the sync inputs of the fourth and fifth triggers the inverse outputs of which are connected to the third inputs of the first and second elements AND, respectively, the transfer output of the second counter is connected to the first input of the OR element and to the first inputs of the sixth and seventh elements AND, the outputs otorrhea connected to inputs of a setting On the fourth and fifth flip-flops, respectively, the forward output the counting trigger is connected to the second inputs of the fifth and seventh elements. And, with the third input of the 2I-OR element and with the fourth input of the second AND element, the inverse output of the counting trigger is connected to the fourth inputs of the 2I-OR element and the first AND element and with the second inputs of the fourth and the sixth element AND, the overflow output of the third counter is connected to the installation input in O of the sixth trigger and to the second input of the OR element, the output of which is connected to the clock input of the counting trigger a gera with both the input of the input of the first counter and the input of the installation in O of the second counter, the input of which is connected to the direct output of the sixth trigger, the inverse output of which is connected to the input of the input of the third counter, the inputs of the signals of information tracking channels of the device are combined and connected to the second inputs of the fourth and the n of the And elements and with the sync inputs of the sixth triggers of all channels of the device.