SU1166127A1 - Device for interrogating users - Google Patents

Abstract

A DEVICE FOR SURVEY OF USERS, containing a switch, groups of information inputs and outputs of which are respectively groups of information inputs and outputs of the device, pulse generator, ring counter, output connected to the address input of the switch, the first and second information outputs of which are connected respectively to the first and second inputs the first element OR and form the information output of the device, the third and fourth inputs of the first element OR are connected respectively to the first information input of the switch and the first input of the second OR element and form the information input of the device, the output of the second OR element is connected to the second information input of the switch, and the second input is connected to the clock input of the ring meter through the delay element, in order to simplify the device, . A frequency divider is entered into it, with the reset input of the frequency divider SL connected to the output of the first OR element, and the information input and output corresponding to the output of the pulse generator and the clock input of the ring counter, respectively.

Description

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The invention relates to computing and can be used, for example, in computing systems for cyclically connecting subscribers to a digital computer.

A device is known dL. communication of subscribers with a digital computer containing a memory unit, a feature generation unit, a comparison unit, a local control device and a switch P.

The disadvantages of this device are the complexity and high cost of equipment for its implementation.

The closest to the invention in its technical nature is a device for polling subscribers, comprising a pulse generator, a switch, groups of information inputs, and outputs of which are corresponding groups of information inputs and outputs of the device and subscriber buses, one information input of the device connected to the input of the switch through the first element 1-SHI, whose second input is connected to the output of the delay element, the information inputs and outputs of the device are connected to the inputs of the second RSHI element, you the ring counter moves are the control inputs of the switch, as well as the trigger, the AND element, the first and second key elements, the threshold delay element 2. .

The disadvantages of the known device are the complexity and instability of the polling time associated with the non-synchronization of the pulse generator and the threshold delay element.

The purpose of the invention is to simplify the device and increase the stability of the polling time.

The goal is achieved by the fact that, in a device containing a switch, the groups of information inputs and outputs are respectively Groups of information inputs and outputs of the device, a pulse generator, a ring counter, a code connected to the address input of the switch, the first and second information outputs of which are connected respectively to the first and second inputs of the primary: element OR. and form the information output of the device, the third and fourth inputs of the first element 1-SHI are connected respectively272

Respectively, the first information input of the switch and the first input of the second OR element form the information input of the device, the output of the second OR element is connected to the second information input of the switch, and the second input is connected to the clock input of the ring counter via the delay element 7, and the reset input of the frequency divider is connected to the output of the first element OR, and the information input and output respectively with the output of the pulse generator

and a clock input ring counter.

Figure 1 presents the block diagram of the proposed device; figure 2 is a functional diagram of the switch.

The device contains (figure 1) bus 1 and 2 information output and bus 3 and 4 information input device, the switch 5, the ring

counter 6, frequency divider 7, element OR 8, delay element 9, element OR 10, pulse generator 11, frequency output bus 12, bus 13-16 groups of information outputs

and inputs of the first subscriber, bus 1720 of the group of information outputs and inputs of the last subscriber, bus 21 of the control input of the switch 5.

The number of subscribers polled depends on the specific application of the device and is determined by the difference in the ring counter 6 and the switch 5, which contains the elements OR 22 and 23, the elements AND 2431.

The device works as follows.

In the process of information exchange, the paraphase signals O and 1, arriving at the buses 3 and 4, are transmitted through the switch 5 to the subscriber or from the subscriber through the switch 5 arrive at the buses 1 and 2 of the device. The ring counter 6 is in

when the signal of the logical unity is present at the output of the discharge, the number of which corresponds to the number of the subscriber being polled. Let, for example, signal 1 be present on

the output of the first discharge of the ring

counter, and, in the remaining bits of O. In this case, the enabling signal arrives at AND 24-27 elements and enables exchange of information with the first subscriber. The signals from buses 3 and 4 through the element OR 10 are fed to the inputs of open elements AND 24 and 25 and from the outlets of these elements to buses 13 and 14 of the first subscriber. The signal from the first subscriber on tires 15 and. 16 through open elements OR 22 and 23 arrive at tires 1 and 2 of the device. In the process of information exchange with the subscriber, signals 1 present on buses 1-4 are fed to the inputs of the OR element and from its output go to the reset input of the divider 7. When signal 1 is present at the reset input, the divider 7 is set and held in the zero state. The division of the input frequency of the signals from the generator 11 is ate to 7 times when there is a zero signal at the reset input. After the end of the information exchange with the subscriber, buses 1–4 lack signals 1, the output of the VIII unit element is 0, the divider 7 starts dividing the frequency of the signals coming from the generator 11 output. After a time determined by the frequency of the generator 11 signals and the divider division factor 7, a signal 1 is generated on the bus 12, which is fed to the inputs of the ring counter 6 and the delay element 9. The ring counter 6 on the leading edge of the signal 1 on the bus 12 switches and the signal 1 goes on the output of its next bit. This signal will be sent to the address input of switch 5 and will allow polling of the next subscriber. The signal from bus 12 is delayed by delay element 9 for a time sufficient to cause ring counter 6 to switch to the next state, and through element III 10 and switch 5 as a signal to the next subscriber bus. If the subscriber is ready to exchange information, then signals 1 will appear on buses 1-4, which, through SHSh 8, set divider 7 to zero. After the exchange of information with the subscriber is completed, signals 1 through 1 are missing. After a certain time, a signal appears on bus 12 that takes the ring counter 6 to the next state and allows information exchange with the next subscriber. In this way, an alternate exchange process with subscribers is carried out. After the exchange with the last subscriber, the device polls the first subscriber, etc. If the subscriber is not ready to exchange information, there is no signal 1 on bus 1-4 for more than a certain time, on bus 12 divider 7 produces signal 1, which is ne | The unit will enter the state to poll the next subscriber. If none of the subscribers is ready to exchange information, on bus 12, dividend 7 generates signals 1, ensuring that all subscribers are polled in turn until the subscriber is ready to exchange information. Thus, the proposed device allows a sequential polling of a subscriber, providing each subscriber with an arbitrary time for the exchange of information. At the same time, compared with a well-known device, the operation of the proposed device is simplified; the number of inter-element links decreases, the reliability and stability of switching to work with another subscriber increases after the exchange with the previous subscriber is completed.

figure 1

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Claims (1)

SUBSCRIBER CONTROL DEVICE, comprising a switch, the groups of information inputs and outputs of which are respectively groups of information inputs and outputs of the device, a pulse generator, a ring counter connected to the address input of the switch by the output, the first and second information outputs of which are connected respectively to the first and second the inputs of the first OR element and form the information output of the device, the third and fourth inputs of the first OR element are connected respectively to the first information input ohm of the switch and the first input of the second OR element and form the information input of the device, the output of the second OR element is connected to the second information input of the switch, and the second input through the delay element is connected to the clock input of the ring counter, which differs in that, in order to simplify devices. a frequency divider is introduced into it, and the reset input of the frequency divider is connected to the output of the first OR element, and the information input and output, respectively, with the output of the pulse generator and the clock input of the ring counter. SU, 1166127 66127 2