SU1661780A2 - Multichannel prioritiezer - Google Patents

Abstract

The invention relates to computing, in particular, to priority devices, and can be used to organize access from several subscribers to a common resource, in particular, to a common highway. The purpose of the invention is to expand the field of application of the device due to the possibility of the device operating simultaneously with two computing systems. The device contains before the first channel: two NOT elements, in each of the M channels: two triggers, nine AND elements, three OR elements, a NOT element, a decoder, after the last channel: two delay elements. The device works as follows. Subscribers to both systems can exchange on the backbone of both systems, resulting in improved performance of both systems. Moreover, the subscribers of the first system have an absolute priority relative to the subscribers of the second system regardless of the trunk (both for the trunk of the first system and for the trunk of the second system). The device uses a decentralized arbitration principle, where the polling signal is generated by the element NOT before the first channel, i.e., a potential polling signal is used. 1 il.

Description

The invention relates to computing, in particular, to priority devices, can be used to organize the circulation from several subscribers to a common resource, in particular to a common highway, and is an improvement of the device according to aut. St. No. 1568044.

The purpose of the invention is to expand the field of application of the device due to the possibility of the device operating simultaneously with two computing systems.

The drawing shows a diagram of the proposed device.

 The device contains M channels 1. Before the first channel, the elements are HE 2 and 3 and in each of the M channels 1 there are triggers 4 and 5, elements AND 6-14. elements OR 15-17, element NOT 18, decoder 19, system request inputs 20 and 21, response outputs for subscriber exchange of the first system over the first system 22. the subscriber of the second system over the second system 23, subscriber of the first system over the second the system 24, the subscriber of the second system — via the trunk of the first system 25; the subscriber of the first system — via the trunk of the first system; and the subscriber of the second system — via the highway of the second system 26, device inputs 27-32, device outputs 33-38, delay elements 39 and 40 after last channel.

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The device works as follows.

In the initial state, the triggers 4 and 5 of all channels are at zero. When the device is switched on, a high potential appears at the outputs of the HE elements 2 and 3, the leading edge of which sequentially polls the channels. In the absence of a request signal in the channel, a high potential arrives at the inputs of the HE elements 2 and 3, respectively - a quenching cycle occurs, etc. With the appearance of a low potential at the input 20 of the request from the subscriber of the first system (request signal) and the absence of requests from subscribers, the second system on the leading edge of the poll from the input 27 of the device trigger 4 is set to one, a high potential appears at the output of the OR 16 - trigger 5 cannot be set to one by the considered request signal. When a high potential appears at the input 28 of the device, at the output of element 6, a high potential appears at the output of the response to exchange the first system through the trunk of the first system 22, the interrogation of the channels along the first polling line stops, since the high potential is not passed by the element i 7, When a request is cleared, trigger 4 is set to zero, the polling of channels on the first polling line is resumed.

With the considered request signal and no polling on the first polling line, the leading polling edge from the device input 31 is set to one trigger 5, and when a high potential appears at the device input 32, a high potential appears at the output of the element 11, at the response output for subscriber exchange of the first system through the backbone of the second system 24. If the request signal is removed before the interrogation signal arrives at the device input 27, the subscriber of the first system ends the exchange over the backbone of the second system, removes the request signal, When this flip-flop 5 is set to zero, it is resumed on the second channel a poll survey line.

If the interrogation signal arrives at the first interrogation line before the interrogation signal is removed, then the first trigger 4 is set to one, through the OR 16 element, the trigger 5 is set to zero, the interrogation of channels along the second interrogation line is resumed, a low potential appears at the response output for the exchange of the subscriber of the first system via the trunk of the second system and the high potential appearing at the device input 28, the channel is selected as described. If there are requests only from subscribers of the second system, the device works in the same way. If there are requests from the subscriber first and from the subscriber in the channel

the second system and the availability of polls on both polling lines; the subscriber of the first system selects the trunk of the first system; the subscriber of the second system selects the trunk of the second

system, there is a high potential at the output 26 of the response. If at that time, when the subscriber of the second system exchanges either the trunk of the first or the second system, there is a high potential for

0 output 36 of the device (one of the highways is occupied by one of the subscribers of the first system) and output 35 of the device (at least one more request from the subscriber of the first system), a high potential appears at the output

5 elements AND 14 channels, the subscriber of the second system of which makes the exchange, high potential at the output of the element OR 17, which sets the trigger 4 or the trigger 5 to zero (depending on which

0 from the trunk exchanges the subscriber of the second system), this trunk is released and captured by the subscriber of the first system who interrupted the exchange of the subscriber of the second system with the next interrogation signal.

5 The subscriber of the second system, the exchange of which is interrupted, can again seize the trunk on the next interrogation signal if a low potential is detected at least at one of the outputs 35 and 36 of the device

Claims (1)

0 claims Multichannel priority device on aut. St. No. 1568044, characterized in that, in order to expand the field of application of the device due to the possibility of the device operating simultaneously with two computing systems, each channel of the device additionally contains an element NOT, the first to the third additional elements AND, an additional element OR, and the first input of the device channel request is connected to the input of the element NOT, the output of which is connected to the first inputs of the first and second additional elements AND, the second inputs 5 of which are connected respectively with the direct and inverse outputs of the first trigger, the output of the third additional element AND is connected to the first input of the additional element OR, the second input 0 which is connected to the second input of the device channel request, and the outputs of the first additional elements AND of all channels are combined through the MOUNTING IL AND and connected to the first inputs of the third 5 additional elements AND all channels of the device, the outputs of the second additional elements AND of all channels of the device are combined through MOUNTING OR and connected to the second inputs of the third additional elements AND all channels of the device. , i 28 22 2lt 26 23 25 20222426 212325