SU855664A1 - Multi-channel priority device - Google Patents

Description

one

The invention relates to computing, in particular, to priority devices and can be used to control the access of several subscribers to a shared resource.

A multichannel priority device is known, which contains the OR element, the NOT element, and in each channel there are three AND elements, two triggers, one OR element, and one NOT element. .

The disadvantage of this device is the need for a large amount of equipment for each channel.

The closest to the proposed technical essence and the achieved result is a multichannel priority device containing two pulse distributors, an encoder, a register, three OR elements, and in each channel a trigger and two AND elements, with the output of the first element And channel connected to the installation input the trigger, the trigger output is connected to the input of the element AND channel, the output of which is connected to the common input of the trigger 2.

The disadvantage of this device is that it has a large amount of equipment.

The purpose of the invention is to reduce equipment.

The goal is achieved by the fact that in a multichannel priority device containing a pulse distributor, an OR element, and in

10 each channel - a trigger and two elements And, and the output of the first element And channel is connected to the installation input of the channel trigger, the extinguishing input of the channel trigger is connected

15 with the output of the second element AND channel, the output of the element OR is connected to the input of the pulse distributor, the output of the channel trigger is connected to the first input of the second element AND channel,

20, the second input of the second element AND the channel is connected to the corresponding output of the output group of the pulse distributor;

25 OR, and the output with the first inputs of the first elements AND channels, the second input of the first element AND channel connected to the corresponding request input device, the outputs of the triggers

The 30 channels are connected to the inputs of the OR element, the output of the pulse distributor is the output of the device.

In addition, the pulse distributor contains the counter, the decoder element And and the pulse generator, and the outputs of the counter through the decoder are connected to the group of outputs of the pulse distributor, the output of the pulse generator and the input of the pulse distributor through the element And are connected to the counting input of the counter and the output of the pulse distributor.

° The drawing shows a block diagram of the device.

The multichannel priority device contains the element NOT 1, the element OR 2, the distributor of 3 pulses, made in the form of the decoder 4, the counter 5, the element AND 6, the generator 7 of pulses, the channels 8-10, each of which contains the first element And 11, the trigger 12, the second element is And 13. The device has a group of request inputs 14 and output 15.

The device works as follows.

In the initial state, the counter 5 of the distributor 3 pulses and the triggers 12 channels 8-10 are in the zero state, and at their outputs there are zero potentials, zero potentials at the inputs of the element OR 2, at the inputs of the elements AND 1 of channels 8-10 and at the input of the element And 6 distributor 3 pulses. High potentials - at the output of the element is NOT 1 and, therefore, at the second inputs of the elements And 11 channels 8-10. When requests are received from any of the inputs of the group of inputs 14, these requests, via the elements 11 of the corresponding channels, arrive at the installation inputs of the flip-flops 12 of these channels and set the triggers 12 to one state. At the same time, a high potential from the outputs of the trigger 12 through the element OR 2 enters the input of the element NOT. 1 and the input element And the transmitter of the 3 pulses. Then, at the output of the element NOT 1, the potential is low, and the elements AND 11 of the channels 8-10 are closed. Element And b of the distributor 3 pulses will open and the pulses from the generator output 7 pulses through the element And b arrive at the counting input of the counter 5 and at the output 15 of the device. Counter 5 operates in scaling mode until it accumulates the number of pulses corresponding to the highest priority request source. Upon reaching the corresponding number of pulses, one of the outputs of the decoder 4 will operate and open element 11 of the most senior of channels 8-10, at the input of which there is a request. Then the output signal of the element And 13 of this channel will return the trigger 12 of this channel in

zero state. .After all the requests memorized by the triggers 12 are serviced, the output of the OR 2 element is low potential, the AND element b is closed, and the element is NOT

Make you reopen the elements AND

II to receive a new series of requests. The number of pulses, removed from the output 15 of the device, indicates the number of the highest received and processed requests.

Thus, a new set of features makes it possible to reduce the equipment of a known device by eliminating the second pulse distributor.

Claims (2)

1. Multi-channel device 0 priority, containing a pulse distributor, an OR element, and in each channel - a trigger and two AND elements, the output of the first AND element of the channel is connected to the installation input of the channel trigger, the damping input of the channel trigger is connected to the output of the second AND element, the output of the OR element connected to the input of the pulse distributor, the output of the channel trigger is connected to the first 0 the input of the second element AND channel, the second input of the second element AND channel connected to the corresponding output of the output group of the pulse distributor, characterized in that, in order to reduce the equipment, it contains the element NOT, the input of which is connected to the output of the element OR, and the output with the first the inputs of the first elements of the channels, the second input of the first element of the channel is connected to the corresponding request input of the device, the outputs of the channel triggers are connected to the inputs of the OR element, the output of the pulse distributor is the output of the mouth oystva. 2. The device according to claim 1, about t l And-. partly by the fact that in it the pulse distributor contains a counter, a decoder, an element And and a pulse generator, and the outputs of the counter through the decoder are connected to a group of outputs of the pulse distributor, the output of the pulse generator and the input of the pulse distributor through the element I is connected to the counting input of the counter and to the output of the pulse distributor. Sources of information taken into account in the examination 1. Author's certificate of the USSR 249770, cl. G 06 F 9/18, 1969. 2. Authors certificate of the USSR 468240, cl. G 06 F 9/18, 1975 .(prototype). dJ ten ay. o “By /  t X 75 Н1м1) |    I. 1 m