SU1615716A1 - Device for servicing requests - Google Patents

Abstract

The invention relates to computing and can be used in computing systems. The purpose of the invention is to expand the field of application of the device by providing an opportunity in the new polling cycle to begin polling from a source whose number is one more than the source number served in the previous cycle, if there is a request from this source to the beginning of the current service. The device contains a trigger, elements AND, OR, a counter, a decoder, a register, a group of elements AND, a pulse shaper, delay elements and an element NOT. After the service of the next source is completed, the device cyclically polls the other sources, starting with the number, for a unit of the larger number of the source served. 1 il.

Description

Image grid refers to the evaluator. NOI technology and can be used in computing systems.

The purpose of the invention is to expand the field of application of the device by providing an opportunity in the new polling cycle to begin polling from a source whose number is one more than the source number served in the previous cycle, if there is a request from this source to the beginning of the current service.

The drawing shows the layout of the device.

The device contains a trigger 1, elements And 2-5, elements OR 6-9, counter 10

   2- And 13 elements, shaper 14 pulses, delay elements 15 and 16, NOT element 17 request inputs 18, response inputs 19 device reset input 20, clock input 21. enabling input 22, signal v.-stroke j and information outputs 24.

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The device works as follows.

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When the power is turned on with a pulse from input 20, trigger 1 and register 12 are zeroed. On inputs 18, service requests are written to register 12. The input 21 receives clock pulses. .

Let the device be in the waiting state (at the beginning of the operation or while servicing the request), at which the trigger 1 is in the zero state. The resolution impulse received at input 22 passes through the element OR 9 and is fed to the control input of a group of elements AND 13. If one of the elements of group 13 is triggered, then a signal appears at the output of the element IL AND 7 that passes to output 23 devices signaling the service device to start service. The binary code of the number of the detected request is removed from the addressed outputs 24. The signal from the output of the IL-7 element is fed to the input of the element

Both 5 and the NOT element 17. After the NE 17 is triggered, a signal must appear at the output of the delay element 16, which is fed to the inputs of the AND 3 and 5 elements. And the 5 element is triggered, which leads to confirmation of the zero state of the trigger 1. Positive the front of the pulse from the output of the element OR 7 passes through the shaper 14 and with the delay necessary for confirming (the day of the locked state of the element AND 2 passes through the element OR 6 to the counting input of the counter 10, increasing its contents by one. The device is transferred to the state waiting, EU and none of the elements of group 13 when a pulse is applied to inputs 22, then after an appropriate time a signal appears at the output of the delay element 16, which triggers the element 3 and triggered installation 1 in the unit state. This clock pulses begin to pass through the elements AND 2 and OR 6 to the counting input of the counter 10. Signals from the output of the decoder 11 sequentially, polled the sources, requests from which are stored in the register 12. When a request is found, the corresponding element And 13 opens P is the signal at the output of the element ML AND 7, which first passes to the output 23 and goes to one of the input elements of the AND 4 element, the other input of which has a high level taken from the output of the trigger 1. The element 4 is activated and the trigger 1 is set to zero state the As a result, the clock cycle is stopped (; zyh impulses to the start of counter 10 and the group of elements AND 13 is closed, which leads to a signal from output 23. The positive front of the pulse from output,; 10 elements OR 7, the analogue described above passes through the driver 14, and the operation, p, and u increase of the counter of the counter of the unit is 10. The device is put into the idle state, etc.

The serviced request is removed by pulse at the corresponding input of the 19th group. The next cycle of operation of the device starts with a pulse at the input 22. The formula W 3 is about 5 r and 8 l; and a request service device comprising a trigger, a first AND element, a first and a second OR element, a counter, a decoder, a register, a group of AND elements, a pulse shaper and a first delay element, the trigger output being connected to the first input of the first AND element, the second the input of which is connected to the clock input of the device, the output of the first element I is connected to the first input of the first element OR, the output of which is connected to the counting input of the meter, the outputs of which are connected to the information outputs of the device and to the inputs ifator, each output of which is connected to the first input of the element of the same name and group, the second input of each element and of which is connected to the output of the register of the same name, the unit and zero inputs of the discharge of which are soy, tsenen respectively with the inputs of the same name of the group of request and response inputs of the device the reset of which is connected to the register reset reset and the trigger input, the outputs of the AND group elements are connected to the inputs of the second OR element, the output of which is. connected to the signal output of the device and to the input of the pulse generator, the output of which is connected to the input of the first delay element, the output of which is connected to the second input of the first OR element, characterized in that, in order to expand the field of application; polling cycle, start polling from a source whose number is one more than the number of the source served in n: the adicush cycle, directing the request from this source to the beginning of the current service, in third time, the third and fourth elements

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; ment delay, the second.

trs21 and the fourth element AND and the element are NOT, and the device enabling inputs are connected to the first input of the third element 1 / 1Л1 / 1 and the output of the second delay element, the output of which is connected to the first input .1 of the second elec / st / 1, output which is connected to a single trigger trigger, the output of which is connected to the second input of the third element I and to the first: fourth input of the fourth element I, rigo is connected to the first input of the fourth malicious signal vlflVt, the output of the second element OR is connected to the input of the second element NOT whose output is connected to the second input of the second the OR element, the output of which is connected to the zero input of the trigger, the output of the second delay element is connected to the second house of the fourth element I.

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Claims (1)

Claim A request servicing device comprising a trigger, a first AND element, a first and second OR element, a counter, a decoder, a register, a group of AND elements, a pulse generator and a first delay element, the trigger output being connected to the first input of the first AND element, the second input of which • connected to the clock input of the device, the output of the first element 5 AND is connected to the first input of the first • OR element, the output of which is connected to the counter input of the counter, the outputs of which are connected to the information outputs of the device and to the inputs a fractor, each output of which is connected to the first input of the same element AND of the group, the second input of each element And which is connected to the output of the same category register, the single and zero inputs of the bits of which are connected respectively with the same inputs of the group of request and response inputs of the device, the reset input of which is connected with the input of the reset register and the installation input of the trigger, the outputs of the elements AND groups are connected to the inputs of the second OR element, the output of which is connected to the signal output of the device and to the input a pulse shaper whose output is connected to the input of the first delay element, the output of which is connected to the second input of the first OR element, characterized in that, in order to expand the scope by providing the possibility in the new polling cycle to start polling from a source whose number is one greater than the number of the source served in the previous cycle, if there is a request from this source to the beginning of the current service, the third and fourth OR elements are entered into it. second 1 delay element, second, third and fourth AND element and NOT element, moreover, the enabling inputs of the device are connected to the first input of the third OR element and the output of the second delay element, the output of which is connected to the first input of the second AND element, the output of which is connected to the trigger input whose output is connected to the second input of the third AND element and to the first input of the fourth AND element, the output of which is connected to the canine input of the fourth OR element, the output of the second OR element is connected to the input of the NOT element, output 50 to torogo coupled to a second input of the second OR gate whose output is connected to the zero input of the flip-flop, the output of the second delay element coupled to a second input of the fourth element I.