SU1437862A1 - Multichannel priority device - Google Patents

Description

NU

with

00 O)

The invention relates to computer technology, in particular, to priority devices, and can be used to organize a call to a common resource from several subscribers.

The purpose of the invention is to expand the field of application of the device due to the redistribution of priorities of channels depending on the number of resource captures corresponding to subscribers of these channels.

The drawing shows the functional diagram of the device.

The device in each of the M channels

1SOD er / whale elements 2 and 3 delays, triggers 4 and 5, elements AND 6–9, shift register 10, counter P, single-oscillators 12 and 13, elements NOT 14 and 15, elements OR 16 and 17, elements 1 ShI-NOT 18, multiplexer 19, element NOT 20, one-shot. 21, element 1, 22, in the call from the M channels there is an input 23 of the request to capture the resource, output 24 confirming the capture of the resource, the first input 25 of the device in all channels, the second input 26 of the device, to the gate from the M channels 1 the first output

27 devices in all channels except the last, second output 28 of the device.

The device works as follows.

In the initial state, the triggers 4 and 5 of all the channels are in O, the contents of the shift register 10 and the counter II of all channels are equal to 0. When the device is turned on at the leading edge of the high potential, which appears at the output of the element HE 20, one EAB 21 produces impulse of demand, which through the element OR 22 goes to the first input 25 of the device of the first channel. In the absence of a high potential at the input 23, the polling pulse passes from the first input 25 of the device through the elements 3 and

2delays, element AND 6, element OR 17 to the first output of the device 27 and so sequentially through all channels and from the output of the device 27 of the last channel to the input of the element OR 22, to the first input of the device 25 of the first channel, etc. In this case, the channels are polled, since with the contents of counter 11, all is O, the output of multiplexer 19 is connected with the output of the lower bit of register 10, and very

five

0

five

0

five

0

five

0

five

The interrogation signal shifts its contents by one and after passing the 1 -th interrogation signal through the channel sets the register 10 to O along the circuit: multiplexer 19, trigger 5, element AND 7. Thus, the channel is interrogated by each interrogation signal. If a high potential appears on the control input 23 of the channel resource pickup request, then the trigger 4 of this channel is set to the next interrogation pulse, a high potential appears at the output 24 of the resource capture confirmation, the interrogation signal is not passed further element 6, the polling of the channels is terminated. When the request signal is removed, a trigger 4 is set, at 0, a low potential appears at the output 24 of the resource pickup confirmation, a pulse appears at the output of the one-shot 12 that passes through the OR element 17 to the first device output 27, starting polling the channels , following the selected one, and increases the content of the counter 11 by one. After that, the previously selected channel is polled with every second polling pulse, since the output of multiplexer 19 is connected to the second output of register 10, and so on. If the content of counter II of at least one channel is O, then the output of the liTJl-HE IB element of this channel is a high potential that maintains a high potential at the second input 26 of the device, the second output 28 of the channel device. As soon as the contents of the counter 11 of all channels are not equal to O, a low potential appears at the second input 26 of the device, the second output 28 of the channel device. On the leading edge of the high potential, appearing at the output of the element NOT 15, a pulse appears at the output of the one-shot 13 of all channels, which reduces the contents of the counter 11 of all the channels by one. Thus, at least one device channel is always polled with each polling pulse. If the content of the counter 11 of any channel is all 1, then a high potential appears at the output of the element And 9 of this channel and along the circuit: element 11PI 16, one-shot 13, the contents of the counter 11 of this channel decreases by one, which allows support 1437862

device channel priority frequency which is at present

Tg

The time produced is not information.

less than 2 exchanges

Claims (1)

Invention Formula A multichannel priority device containing a NOT element and K (K is the number of device subscribers) channels, each of which contains a first trigger, a first delay element and a first I element, the first and second inputs of which are connected respectively to the output of the first delay element and to the inverse trigger output The direct output of which is connected to the output of acknowledgment of the seizure of the resource of the channel of the device, characterized in that, in order to expand the scope of application due to the redistribution of the priorities of the channels depending on the number tva produced resource captures by the subscribers corresponding to these channels, it additionally contains a single oddator and an OR element, and a second delay element, the first and second single vibrators, the shift register, the counter, the second trigger, the multiplexer, and the second to fourth elements are added to each channel And, the first and second elements OR, the element 1SHI-NOT, and the input and output of the element are NOT connected respectively to the bus of the logical zero of the device and to the input of the one-vibrator, the output of which 0 five 0 25 the output of which is connected to the input of the addition of the counter unit and to the first input of the first OR element, the second input of which is connected to the output of the first element AND, the output of the first element OR M th (, K-O channel of the device is connected to the first input of the second element AND M th the channel of the device, with the input of the shift register shift and the input of the second delay element (M + 1) -th channel of the device, the output of the first element OR of the K-th channel is connected to the first input of the second element AND of the K-th channel and to the second input of the OR element, each channel output of the second, ale This AND is connected to the inputs of the installation in О of the shift register and the second trigger, the output of which is connected to the second input of the second element AND, the outputs of the shift register are connected to the information inputs of the multiplexer, the output of which is connected to the installation input of 1 of the second Trigger and the first input of the third element And, the second input of which is connected to the input of the request for capturing the device channel resource, on each channel the output of the third element AND connects to the information input of the first trigger and the input of the first element NOT, the output of which Connected to the installation input of the first trigger O, the counter outputs are connected to the inputs of the Tg element OR NOT, the fourth AND element and the address inputs of the multiplexer, the output of the fourth AND element is connected to the first input of the second element OR, the second input and output of which are connected It is not connected to the first input of the OR element, which is allocated respectively to the output of the secondary input of which is connected to the input of the shift register and the input of the second .delay element of the first channel, in each channel the output of the second delay element is connected to the synchronous input of the trigger, my trigger output is connected to the input of the first one-shot. 45 This element is NOT and with the input of the third one-shot, the output of which is connected to the input of the subtraction of the counter unit, the outputs of the elements OR NOT of all channels are combined according to the Mounting OR scheme and connected to the inputs of the second elements of NOT each channel of the device. 20H21 2S 2o IJI