SU1105894A1 - Priority scanning device - Google Patents

Abstract

DEVICE FOR PRIORITY POLL, containing two commutators, OR element, register, and decryption. a torus, the group of request inputs of the device is connected to the group of information inputs of the first switch, the group of outputs of which is the first group of information outputs of the device, the control inputs of the first and second switches are connected to the output of the decoder, the input of which is connected to the output of the register / group of information inputs of the device connected to the group of information inputs of the second switch, the group of outputs of which is the second group of information outputs of the device, the output of the OR element Signal output of the device, characterized in that, in order to increase the speed of the device, it contains a group of (n -1) NOT elements, a group of (n-2) OR elements, a group of (.n-1) OR-NOT elements (n is the number of request inputs of the device), an encoder, a block of AND elements and a block of OR elements, with the output of each element OR corpse. a pair is connected to the first input of the element of the same name OR-NOT group, the output of each i-ro (, ..., n) of the element OR group, except the first, is connected to the first input li-l) -ro of the element OR group, except 1, п -2) -th, first, second inputs In-2) -th element OR groups are connected to (n-11th and h-th device request inputs, each i-th and device request input, starting from the second to (n -1) -th. Is connected to the second input (il) -ro of the OR element of the group and to the input of the i-ro element of the NOT group, the outputs of the NOT elements of the group, except the first and (n-ll-ro, are connected to the second inputs of the same element in the OR-NOT group, the output (rt-l) -ro of the NOT element of the group is connected (L to the first input of the same name OR-NOT group, the second input of which is connected to the device’s second input input, the first request input. Device ff is connected through the first element of the NOT group with the second input of the first element OR the NOT group, the outputs of the OR element NOT the group and the fifth request input of the device are connected to the groups of inputs of the OR element and the encoder whose output is the code end of the device and is connected to the first 00 input of the block of elements and, the second entrance cat cerned connected to the input CJSIC starter, the output block elements 4 and expansion valve connected to the first input of the OR block elements, the second input of which is the code input device, the output unit elements or soy .dinen with register input.

Description

The invention relates to computing and can be used in automated control systems used to exchange information between computers and telemechanics systems. A device for priority polling is known, comprising a sensor for polling cycles and a clock generator connected to the binary counter input with the decoder and output circuits, coincidence triggers, differentiation chains, coincidence circuits associated with the corresponding inputs of the decoder, and the OR circuit, with one input three The gera is connected via a differentiating chain to the readiness bus of the corresponding telemechanical information transmission system, and the second input is connected to the decoder output, the trigger output is connected to one input of the corresponding telemechanical system coincidence circuit, the second input of which is connected to the decoder output, and the output is connected to the polling bus telemechanical system and with one of the inputs of the OR circuit, the output of which is connected to the output matching circuits 1.. This device allows only a part of information to be entered into a digital computer, shortens its processing time, but does not allow to receive and transmit it to an arbitrary address, to organize priority service. The main disadvantage of this device is a large amount of equipment, since it requires the introduction of additional equipment priority service, control circuits for switching to work with a counter or with a priority scheme. The closest to the proposed technical entity is a device for priority polling, containing an input switch, the information inputs of which are connected to the corresponding buses of subscribers of the device, and the control input - with the output of the decoder, the input of which. connected to the output of the counter and output information buses of the device, two AND elements, a clock generator connected to the first input of the first AND element, the first OR element, search, request and priority triggers, the output switch the second OR element, and the marker analysis node the first input of the marker analysis node is connected to the output of the input switch and the corresponding output information buses of the device; the first output is connected to the first input of the unit to the request trigger trigger; the second input is to the single output t igger request and output bus query device, and the second output to the first input of the second element OR, the first input setting the query trigger to zero, and zero 1 to the query trigger input and the zero input of the search trigger, a single input of which is connected to the output of the first OR element, the inputs of the connected with the corresponding inputs of the input switch, the single output of the search trigger and the zero output of the request trigger are connected respectively to the second and third inputs of the first And element, the outputs connected to the first input. the counter, the second input of which is connected to the input bus for setting the device’s subscriber address and the second input for setting the request trigger unit, and the third input for the output of the second element AND, the first input connected via the priority trigger to the input bus for setting the device priority, and the second input for the output of the second OR element, the second input of which is connected to the device’s input start bus and the second input of setting the request trigger to zero, the output of the decoder is connected to the control input of the output switch; The third outputs are connected to the corresponding output tires of the device subscribers, and the information input is connected to the input information buses of device 2. The main disadvantage of this device is that it takes a relatively long time to determine the highest priority request from subscribers due to the presence of a clock generator. , a counter and a decoder with which all subscribers are sequentially polled for the request from them. The purpose of the invention is to increase speed by organizing the simultaneous determination of the highest priority request from subscribers. The goal is achieved by having a device for priority polling containing two switches, an OR element, a register and a decoder, the group of request inputs of the device being connected to a group of information inputs of the first cat-gutator, the group of outputs of which is the first group of information outputs of the device the control inputs of the first and second switches are connected to the output of the decoder, the input of which is connected to the output of the register, the second group of information inputs of the device is connected to the group of inputs V cerned switch, the group of outputs which is a second group of information outputs of the device, the output of the OR gate is a signal output device introduced grup-

aa of (p-1) NOT elements, a group of In-2 elements OR, a group of (, p-1) elements OR NOT (where n is the number of device request inputs), an encoder, a block of AND elements and a block of OR elements , moreover, the output of each element OR group is connected to the first input of the same name element OR NOT group, the output of each i-ro ... p. an element of the OR group other than the first is connected to the first input (.il) -ro of the element or Li of the group other than h-2) -rb, the first, second inputs of the (, p-2) -th element of the OR group are connected to (p-1) th and nth device request inputs, each 1st device request input starting from the second to (n-1) -th, is connected to the second input Ul) -ro of the OR element of the group and to the input of the i-ro element of the NOT group, the outputs of the elements of the NOT group, except the first and (p-1) -To, are connected to the second inputs of the same-named elements OR NOT the group, the output of the (p-1) -th element of the NOT group is connected to the first input of the same-name element nta OR-NOT groups, the second input of which is connected to the n-th device request input, the first request input of the device is connected through the first element of the NOT group to the second input of the first element OR-NOT group, the outputs of the elements OR-NOT group and and-and the request input devices are connected to groups of inputs of the OR element and the encoder, the output of which is the code output of the device and connected to the first input of the block of elements AND, the second input of which is connected to the start input of the device, the output of the block of elements AND connected to the first input of the block in the OR, the second input of which is a code-input devices, output elements coupled to OR block register input.

The drawing shows a block diagram of the device.

The device contains switches 2, a group of elements NOT 3, ..., a group of elements OR 42, .-. 4., A group of elements OR-NOT 5, ... S. an element OR 6, an encoder 7, a block of elements OR 8, a register 9, a TO decoder, an AND block 11, information output device 12, device signal output 13, device code output 14, device code input 15, device information inputs 16, 17, device start input 18, device information outputs 19.

The device works as follows.

In the mode of receiving information, signals from subscribers arrive at inputs 16. Further, these signals arrive at the same inputs of the elements HE 3 and OR 4 (except the last subscriber. ElementNE 3, -OR 4 and OR-NOT 5 provide the selection of the highest priority request from subscribers The subscriber with the highest serial number is selected. For example, when a request from an n-th subscriber is received, the signal from n-th input 16 is fed to the input of the encoder 7, as well as to the inputs of the OR element 4 and the OR OR NOT p- element l providing the appearance on all other outputs of the elements OR NOT 5. (i 1 ... h-1) zero signals, thus in this case all zero signals will be at the inputs of the encoder 7, except for the lth input, where there will be a single signal. The code of the priority number appears at the output of the encoder 7 request from subscribers, which through the open group of elements AND 11 (in the initial state on: device input 18 is high potential) and through the group of elements OR 8 goes to register 9. The code from register 9 goes to decoder 10, which provides communication with subscriber making a service request, through the output com Mutator 2. Earlier, a single signal corresponding to the highest priority request goes to the input of the same name of the element OR 6 (in our example, to the nth input), and then, at output 13, to the digital computer, the latter informs about the presence of a request from the subscriber. After receiving a signal about the presence of a request, the digital computer removes a high potential from input 18 and then information from the subscriber goes to the digital computer via output switch 2 on output 12.

In the mode of transmitting information to the subscriber of the digital computer, the subscriber number code is sent to input 15, and the code is: measure through the group of elements OR 8 by; steps into register 9, and then to the decoder 10) at one of the outputs of which a single signal appears which provides the connection of the selected subscriber with a digital computer via input 17 through the input switch 1.1 switch 1.

Thus, the proposed device provides a significant increase in speed, and the speed of the proposed device does not depend on the sequence number of the subscriber with which the connection is established.

Claims (1)

DEVICE FOR PRIORITY POLL, containing two commutators. pa, OR element, register and decryption. a torus, and the group of request inputs of the device is connected to the group of information inputs of the first switch, the group of outputs of which is the first group of information outputs of the device, the control inputs of the first and second switches are connected to the output of the decoder, the input of which is connected to the output of the register, the group of information inputs of the device is connected to the group information inputs of the second switch, the group of outputs of which is the second group of information outputs of the device, the output of the OR element is device output, characterized in that, in order to improve the performance of the device, it contains a group of (η -1) NOT elements, a group of (l-2) OR elements, a group of (π-1) OR-HE elements (p - the number of request inputs of the device), the encoder, the block of AND elements and the block of OR elements, with the output of each element OR corpse. py is connected to the first input of the same element OR-HE group, the output of each i-ro ('= 1, ..., n) element OR groups, except the first, connected to the first input (il) -ro element OR groups, except ( p-2) -th, first, second inputs of the (p-2) -th element of the OR group are connected to the (n-11th and -th request inputs of the device, each i-th request input of the device, starting from the second to ( η-l) -th ^ is connected to the second input of the (i-Ι) -th element of the OR group and to the input of the ϊ -th element of the NOT group, the outputs of the elements of the NOT group, except the first and (nl) -ro, are connected to the second inputs of the same name elements and AND-HE group, the output of the § (n-1) -th element of NOT group is connected to the first input of the same element OR-HE group, the second input of which is connected to the ηth request input of the device, the first request input of the device is connected through the first element of the NOT group with the second input of the first element of the OR-HE group, the outputs of the elements of the OR-HE group and the n-th request input of the device are connected to the groups of inputs of the OR element and the encoder, the output of which is the code output of the device and connected to the first input of the block of elements and, the second input of which connected to the entrance behind start-up of the device, the output of the block of AND elements is connected to the first input of the block of OR elements, the second input of which is the code input of the device, the output of the block of OR elements is connected to the register input.