SU1462309A1 - Multichannel priority device - Google Patents

Abstract

The invention relates to computing and can be used in organizing the access of several subscribers to a common resource. The purpose of the invention is to expand the scope of application due to the possibility of functioning in a random priority mode and in a mode defining the preferential servicing of subscribers depending on their location in the device. priority element contains NOT and M channels, each of which contains a trigger, decoder, two delay elements, two elements NOT, four And element re and three elements OR. I il.

Description

. ..I

The invention relates to computing and can be used in organizing the access of several subscribers to a common resource.

The purpose of the invention is to expand the scope of application due to the possibility of functioning in the random priority mode and in the mode defining the preferential service of subscribers depending on their location in the device,

The drawing shows the fztsktsional scheme of the proposed device

The device contains M channels 1, each of which contains elements 1 and 2 delays, trigger 3, decoder 4, elements OR 5-7, elements AND 8-11, elements NOT 12 and 13, before the first channel the device contains element NOT 14, in each channel input 15.

mode, the channel request input 16, output 17 is confirmed, the values of the channel request, the first and second inputs 18 and 19 of the device polling, the first and second outputs 20 and 21 of the device polling

The device works as follows

In the initial state, the trigger 3 is in When the device is turned on, the output element HE 14 before the first channel appears high potential, which in the absence of high potential at the input 16 of the channel request of all channels through the element 8 goes to the first input 18 of the next device interrogation channel and so passes through all the channels From the first exit 20 of the last device polling device, this t is the polling signal is sent to the second input 19 of the last channel device polling and

about

N5

WITH

about with

Both inputs of the decoder 4 receive a high potential, a high potential appears at the fourth output of the decoder 4, which passes a high potential through AND 9 to input 19 of the previous channel, which passes successively through all the channels and enters the input of the element NOT before the first channel 14, which is inverted and the input I 18 of the first channel receives a low I potential, which goes to the input of the Decoder 4, There appears to be a high I potential on the third output of the decoder 4 (the first one involved), to I then The second one maintains a high potential at the second output 21 of the device polling through element I 9, at the fourth I output of the decoder 4 there is a low potential that, through the OR element, allows the low potential to pass to I, the first output 20 of the device polling and j next to the first input 18 of the device polling of the following o From the first: exit 20 polling the device of the last I channel, the low potential arrives at the second input 19 polling the device: the last channel, which passes sequentially through all the channels input element NOT 14 before; the first channel, remove the high potential from the third output of the decoded-to. 4 of all channels and t "Do So. In the device polling signals are generated, I

In the first mode, at the input 15 of the mode, a low potential that maintains a low potential at the output of the element I 10. In this case, the leading edge of the interrogation signal over which the channel can be selected can appear on the synchronous input of the trigger 3 only from the first interrogation input of the 18o device. This front passes through the element AND 11, since the output of the element And in - low potential, element OR 6, on the synchronous input of the trigger 3, and if at this time there is a high potential at the input 16 of the channel request, the trigger 3 is set to 1, high sweat appears ntsial output request acknowledgment channel 17, the poll is stopped channels. Moreover, the trigger 3 can be set to 1 in the presence of the leading edge of the polling signal only at the first input of the device polling, 8. With a high potential for control

When the channel 16 input request is input, trigger 3 is set to O, a low potential appears at the output of the channel 17 acknowledgment output, a high potential passes through the AND 8 element to the first polling input of the device 18 of the next channel, starting polling channels from the channel following the channel who have completed their exchange about

In the second mode, there is a high potential at the input of mode 15. On the leading edge of the polling signal, which appears at the first polling input of the device 18, the device operates in the same way as described. On the leading edge of the polling signal, which appears at the second polling input of the device 19,

A channel, at the input of request 16 of which is high potential, can be selected if there are high potential at the inputs of the decoder 4. In this case, the leading edge of the interrogation signal from the input of device 19 through the element AND 10, the element OR 6 (the output of the element 11 is low potential) enters the synchronous input of the trigger 3 The trigger 3 is set to 1 and a high potential appears at the output of the request confirmation channel 17. the first potential of the survey device 20 of the selected channel is maintained high potential

through the element OR 7 from the fourth output of the decoder 4 "Low potential from the inverse output of the trigger 3 through the element 9 does not allow the polling signal from the output of the element 2 to the other channels. When the request signal is removed, the interrogation signal through the AND 9 element passes into the channel, which is before the selected 5 beginning with the interrogation “

Formula inventions

A multichannel priority device containing an element of NOT and K channels (K is the number of sources of the request), each of which contains a trigger, the first element AND, the first delay element whose input is connected to the first input of the device channel polling,

the output of the first delay element is connected to the first input of the first element I, the first polling input of the first channel is connected to the output of the element NO, the first output of the poll M-20 (M 5

 I CK-l) of the device channel is connected to the first polling input of the (M + 1) th channel of the device, the output of the first element AND of each channel of the device is connected to the first polling output of the channel of the device, characterized in that the account of the possibility of functioning in the random priority mode and in the mode that sets the preferential service of subscribers depending on their location in the device, it additionally contains in each channel from the first to the third elements OR, the second delay element, from the second the fourth elements are AND, the first and second elements are NOT and the decoder, the first output of which is connected to the first input of the first OR element, the output of which is connected to the first input of the second AND element, the second input of which is connected to the output of the second delay element, whose input is connected to the first information the input of the decoder, with the first input of the third element I and the second input of the device channel polling, the second polling output of which is connected to the output of the second element I, the third input of which is connected to the inverse output of the trigger and the first input of the second element OR, the second input of which is connected to the second input of the first ele623096

1 and the second output of the decoder, the second information input of which is connected to the first input of the device channel polling and the first input of the fourth element I, the output of which is connected to the first input of the third, its element SH, the output and second input of which are connected respectively - 10 but with sync trigger and. the output of the third element And, the second input of which is connected to the input of the channel mode setting of the device, the request input of which is connected to the input of the first element NOT and the information input of the trigger, the installation input to and the direct output of which are connected respectively to the output of the first element NOT and the output of the request confirmation the device, the output of the first element AND is connected to the input of the second element NOT, the output of which is connected to the second input-v of the fourth element AND, the output of the second element OR is connected to the second input of the first ele I, the first polling output of the K-th channel is connected to the second polling input of the K-th channel of the device, the second polling output of the P-th (P 2-K) channel of the device is connected to the second polling input (Pl) –ro of the device channel, the second output polling the first channel of the device is connected to the output of the item NOT.

20

25

thirty

Claims (2)

Claim A multi-channel priority device containing an element of NOT and K channels (K is the number of request sources), each of which contains a trigger, the first element And, the first delay element, the input of which is connected to the first input of the channel polling device, the output of the first delay element is connected to the first input of the first element And, the first polling input of the first channel is connected to the output of the element NOT, the first polling output M-20 (M * = l- (Kl) of the device channel is connected to the first polling input (M + 1) of the device’s channel, the output of the first element And every channel > θ is connected to the first output of the channel scan of the device, characterized in that, in order to expand the scope due to the possibility of functioning in a random priority mode and in a mode that sets preferential service to subscribers depending on their location in the device, it is additionally contains in each channel from the first 15 to the third OR element, the second delay element, from the second to the fourth AND element, the first and second elements NOT, and a decoder, the first output of which is connected to the first input of the first OR element, the output of which is connected to the first input of the second AND element, whose second input is connected to the output of the second delay element, whose input is connected to the first information input of the decoder, with the first input of the third AND element and the second polling input of the device channel, the second polling output of which is connected with the output of the second AND element, the third input of which is connected. with the inverse output of the trigger and the first input of the second OR element, the second input of which is connected to the second input of the first OR element and the second output a fractor, the second information input of which is connected to the first input of the channel polling of the device and the first input of the fourth AND element, whose output is connected to the first input of the third, its OR element, the output and second input of which are connected respectively to the trigger sync input and the output of the third And element, the second the input of which is connected to the input of the channel mode setting of the device, the request input of which is connected to the input of the first element NOT and the trigger information input, the setting input is 0 and the direct output of which are connected respectively about with the output of the first element NOT and the output of the confirmation request rocked the device, the output of the first element AND is connected to the input of the second element NOT, the output of which is connected to the second input '/' j of the fourth element And the output of the second element OR is connected to the second input of the first element And, the first polling output of the K-th channel is connected to the second polling input of the K-channel of the device, the second polling output of the P-th (P = = 2-K) of the device channel is connected to the second polling input of the (P-1) channel of the device, the second polling output of the first channel of the device is connected to the output of the element NOT.