SU1381508A1 - Multichannel device for priority connection of subscriber to common trunk line - Google Patents

Abstract

The invention relates to computing technology and may find application in multi-version computing systems and local area networks for connecting several subscribers to a trunk. The purpose of the invention is to expand the functionality of the device by using a common backbone for both arbitrating requests and transmitting information. The cor device holds channels, each of which includes two counters I, 2, two triggers 5, 6, and two elements AND 7, 8. The idleness of the trunk is determined by exceeding the length of the pause for a given time limit. After identifying the absence of a common highway, an arbitration procedure is implemented, based on the fact that the rights of subscribers to seize the highway are divided by time. The device allows to reduce the number of lines of the common highway, increase aggregation and increase system reliability. 1 il. fO (/ s

Description

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The invention relates to computing and can be used in multi-machine systems and local computer networks connecting several subscribers to a common backbone.

The purpose of the invention is to extend the functionality by using a common backbone for both arbitrating requests and transmitting information.

The channel structure of the device is shown in the drawing.

The device channel contains counters 1 and 2, signal output 3 channels, channel code input, triggers 5 and 6, elements 7, 8, channel request input 9, channel clock input 10, channel information input 11. All channels of the device are connected by a common highway 12.

The device works as follows.

The device is designed dp decentralized arbitration of subscriber requests (computers) to capture the common highway.

The subscriber exposes the request to the inlet 9 of his channel for capturing the common highway. After servicing each request, the subscriber removes the active signal from input 9.

When one of the subscribers is connected to the common line, information is transmitted through it. For each transmitted pulse, counter 2 is reset. During a pause in the transmission of pulses, the contents of the counters of 2 all channels are incremented by sync pulses received at the inputs of 10 channels. The pause between the transmission of information from the subscriber capturing the trunk should not exceed the time it takes for counters 2 to go to the state at which the transfer signal is generated. If the subscriber who seized the common trunk stops transmitting information, then a pause on the trunk 12 npe. the time specified by the conversion factors of counters 2 goes back, as a result of which a transfer signal is generated on counters 2 of all channels (during

the pause time on trunk 12 is proceeding. Units are triggered by 5; the counter content of the counters is output by 2 clock pulses from input 10, the counter is not reset by 2 signals from trunk 12 does not occur).

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The transfer signal from counter 2 to trigger 6 is entered by 1 (previously, each signal transmitted along line 12 causes trigger 6 to zero). In the zero state of the flip-flop 6, the counters I are installed on the content present at the inputs 4, and the numbers recorded in the counters 1 of the different channels are different from each other. For example, the number A-1 can be recorded in counter 1 of the first channel, in counter I of the second channel - A-2, etc., where A is the counting factor of counters 1. When the triggers 6 are in zero, the counters 1 are blocked in counting mode . When writing a unit to trigger 6 (as a result of the transfer signal of counters 2), the installation signal of counters 1 is removed and counters 1 are transferred to the counting mode, in which the accumulation of the contents of counters 1 occurs for each sync pulse from inputs 10. Transfer signals for counters 1 of different channels are generated in different points in time, as when installing from inputs 4, different numbers were written in them.

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If the Kth channel does not contain a request to capture the trunk, then when forming the transfer from counter 1, the unit is not triggered by the trigger 5 of this channel, since the R input of trigger 5 is supplied with a level blocking "recording on the D input during arrival the transfer signal from counter 1 to the C input of the trigger 5. If the Kth subscriber made a request to capture the trunk, then the zero reset signal of the trigger 5 at its R input is absent and the transfer signal of the counter 1 arriving at the C input of the trigger 5, a unit is written to it (at the D input of the trigger 5, a constant ton unit level). When a single signal at the input Y and the formation of the transfer signal of the counter 1 to the line 12 from the element And 7 transmits a pulse, the zeroing of the counter 2 and the trigger 6 is performed. When writing zero to the trigger 6, the initial setting occurs. counters 1 all channels and blocking the counting mode counters 1. When

records of flip-flop 5 at output 3, a confirmation signal is generated, by which the subscriber can start transmitting information from input 11. As a result of the procedure described

of a decentralized arbitration, a common trunk is provided to only one of the subscribers making requests to seize it.

To release the common trunk, the subscriber who captured it removes the signal from the input 9 of its channel. At the same time, at an interval determined by the conversion factors of the counters 2, at the outputs of the transfer of the counters 2 of all the channels, a signal is generated, according to which the triggers 6 are set to one state.

After the idleness of the trunk is identified by all channels, the described procedure of its decentralized acquisition is implemented.

Claims (1)

Invention Formula A multichannel device for priority connection of subscribers to a common highway containing channels, each of which contains a first counter and a first AND element, a channel code input connected to the information input of the first counter, the overflow output of which is connected 0 five 0 five with the first input of the first element I, the channel's request input is connected to the second input of the first element I, o t - in that, in order to extend the functionality by using a common backbone for both arbitrating requests and transmitting information , the second counter, two triggers and the second element I, the first input of which is connected to the information input of the channel, the clock input of the channel connected to the counting inputs of the first and second counters, are entered into each channel of the device, the request input of the channel is connected to the inverse the second reset input of the first trigger, the output of which is the signal output of the channel and connected to the second input of the second element I, the outputs of the first and second elements AND of all channels through the mounting pin connected to the reset inputs of the second trigger and the second counter, the output of which is connected to the single input of the second a trigger, the output of which is connected to the recording input of the first counter, the output of which overflow is connected to the clock input of the first trigger.