SU792253A2 - Apparatus for successive interrogation of data source - Google Patents

Description

The invention relates to the field of computer technology, can be used in information exchange systems and is an improvement of the known device described in ed. St. 570048. In the main invention auth.St. I 570048 describes a device for sequential polling of information sources containing a chain of channel selection nodes, the first inputs and outputs of which are relevant, channel inputs and outputs of the device, and a NOT element, an input connected to the second output of the last channel selection node of the chain, and an input with the second input of the first node of the channel selection chain, and kak5kdy1. the channel selector node includes a trigger, the first input and output of which are the first input and the second output of the node, the NOT element and the OR-NOT element, the output of which serves as the first output of the node, the first input connected to the second output of the trigger, and the second input to the second input of the node n through the element NOT to the second input of the trigger C The disadvantage of this device is the limited scope of WH. Because of the impossibility of its 2: use in systems where the group of sources with equal access must exchange information on e with one, and with a group of receivers. The purpose of the invention is to expand the field of application of the device. The goal is achieved by the fact that the device according to ed. St. No. 570048 entered AND elements, the output of each of which is connected to the first input of the corresponding channel selection node, and the first and second inputs are respectively the readiness inputs of the corresponding source and receiver of the device, and the group of OR elements whose inputs are connected to the first outputs of the corresponding nodes channel selection, and the outputs are corresponding to the “1 address output device. The drawing shows a block diagram of the device and an example of an exchange system between groups of sources and receivers. . Device 1 contains channel selection nodes 2, including trigger 3, element 4 and element 4, and element 5, element 6, elements OR 7–11 of the group, element 12, inputs 13, 14 and 15 readiness of sources 16, inputs 17

and 18 readiness of transmitters 19, outputs 20, 21 and 22 of the source addresses and outputs -23 and 24 addresses of receivers.

The drawing shows a group of elements AND 25 and OR 26 of the switch 27 sources and groups of elements AND 28 and OR 29 of the switch 30 receivers.

The device works as follows.

In the absence of ready signals at inputs 13-15 and 17.18, elements are NOT 12, elements are NOT 4 and the first (single) elements 2 AND IS NOT triggers 3 form a ring of an odd number of inverters, since there are no signals at one or both of the inputs of elements And b availability and zero potentials from the inputs of these elements support the triggers 3 in the zero state.

At the same time, high potentials from the inputs of the zero elements .2 AND-NOT triggers 3 are fed to one of the inputs of single elements 2 AND-NOT triggers 3 and the actuation (non-operation) of the indicated elements 2 AND-NOT depends only on the presence (absence) of high potentials on the second the inputs connected respectively to the outputs of the elements NO 12 and 4. In this ring, high potential (single signal) and low potential (zero signal) alternately propagate.

If at least one of the inputs 13-15, for example, at input 13, as well as at least one of the inputs 17, 18, for example, at input 17, signals arrive, then at both inputs of the element and 6 of one of the channels (in this in the case of the second from the left), a high potential will be present, as a result of which a high potential is formed from the output of the indicated element B to the zero input of the corresponding trigger 3, after which the latter is established in a single state. In this case, from the output of the zero element 2 AND-NOT that of the trigger one of the inputs of the single element 2 AND-NOT of the same trigger produces a zero potential preventing the formation of a low potential at the output of this element when a high potential appears at the second input of this element.

As a result, signals from the output of the OR-NOT 5 element of the second node to the inputs of the elements OR 7 and 10 receive the elements AND 25 and 28 for switching among themselves the respective sources and the receiver.

After the exchange is completed, the source removes the ready signal, as a result of which the exchange path is broken, the signal at the output of element B and the trigger 3 of the second node goes into the zero state, allowing the zero signal to flow through the circuit to the next node 2, which has the ready signal falling from the output of the element And b to the input of the trigger 3.

If in a chain of nodes. 2 there are 5 set of sources and receivers that set their ready signals, a path will be formed for the exchange of that node, the first of which will receive a zero polling signal.

Thus, the device ensures the sequential polling of sources and receivers and the connection of any of a group of sources to any 5 specified receiver; from a group of receivers.

Claims (1)

1. USSR author's certificate No. 570048, cl. G About F 9/18, 1975 (prototype),