SU636610A1 - Arrangement for priority servicing of messages - Google Patents

Description

36, the output of the control unit is connected to the second inputs of the first, second and third elements I and to the trigger input of the polling unit. The drawback of the device is the continuation of polling of input drives that failed, until the end of the message appears, releasing output drives that were not addressed by any input drive that failed, which significantly reduces the service time for messages. The purpose of the invention is to increase speed. The goal is achieved by the fact that the device contains triggers, signal elements And the first one) and stopping a group of BANNER elements, the sixth block of elements OR, the first inputs of the elements of the first group of elements of the BLOCK are connected to the corresponding bit outputs of the register, the ZAVRBT are connected with the eighth output of the control unit, the first inputs of the BANNER elements of the second group are connected to the outputs of the corresponding elements ZA11: Ё ЕТ; the first group, into the left inputs of the elements of the second group of elements comrade BAN:-connected with cootr votstvuyuschymi vyhodami- group interrogation unit outputs, outputs 3ANPE elements of the second group are connected to conductive discharge sotvoFStvuyu dnymi input register n cs the gate inputs of the corresponding drive input, single inputs of flip-flops connected to: ootvetstvuzoschimn outputs .deshifratora address. the first inputs and outputs of the signal elements I are connected respectively to the single outputs and the zero inputs of the corresponding triggers, the second inputs to the signal elements of the AND connect with the input and the corresponding output accumulators, and the outputs of the signal elements AND through the sixth block of elements OR are connected to the control input of the control unit. The block diagram of the device shown in the drawing. Device For priority service of messages contains input drives 1, blocks 2-7 of elements OR, register .8, block 9 of control, elements OR 10-12, reversible counters 13-15, elements AND 16-18, decoder 19 addresses, output drives 20, interrogation unit 21, the first group of 22 BANKS 23 elements, the second group 24 BANKS 25 elements, triggers 26, AND 27 signal elements. The positions 28-37 in the drawing designate priority, indication, information outputs 28, 29, 30 respectively and control inputs of 31 input drives, prohibiting and triggering inputs 32, 33 of the polling unit, the control input 34 of the register, the subtracting and summing inputs 35, 36 of the reversible counter, the output 37 of the control unit. The device works as follows. Typically, the message is divided into several blocks, with the first (address block) indicating the priority of the message, the recipient's address, and other service attributes. In this device, four priority messages are served. After the address block has accumulated, one of the signals indicating the priority of the message appears at the outputs of the input accumulators 1. These signals through blocks 3-5 (depending on priority), and the elements OR 10-12 enter the control unit 9. From the onjxJca block 21, the call signals are issued alternately. After interrogating the last input accumulator 1, the interrogation of the first one begins, and so on. Let one of the input drives 1, for example, in the first left, accumulate an address block of a message with the first (highest) priority. When a call arrives at the call, the availability of information appears at the input accumulator output 30. Through block 2, this signal enters polling unit 21 and the interrogation of input accumulators 1 is suspended. From this point on, the Address Call will start from the selected input Auxiliary 1. During the selection process, the priority of the message being served is determined. In control block 9, this priority is compared with the priority: other messages present in all input accumulators 1. If the input accumulators 1 receive messages with a higher priority than the serving message, then this input accumulator 1 is not serviced. If there are no messages with higher priorities, then the information of the selected input accumulator 1 goes to the decoder. 19 addresses where, in response to the address of the message, the call signal of the output accumulator 20 is generated. In response to this signal, a ready signal to receive information is received from a certain output accumulator 20 (if the accumulator 20 is not occupied). In the event that the required accumulator 20 is busy, a signal to receive information is not issued, and a signal is issued which sets the corresponding correspondence to this accumulator 20 trigger 26 into a single state, and a message is given to the Accepted message. Simultaneously with the interrogation of the input drives 1, the state of the corresponding bits of the register 8 is analyzed. Through block 6, the contents of the analyzed bit enter into block 9

control signals, and the presence of high priorities are stored in reversing counters 13-15 (in this case, from control block 9, a signal is output to input 36 of reversing counter 15). This signal is issued only if in register 8 bits corresponding to this input drive 1 is in zero state. After the pulse is pulsed into the reversible counter 15, a unit is recorded at the corresponding register bit 8 by a signal received at the register input 34.

Thus, with subsequent failures of this input drive 1, the contents of the corresponding register bit 8 is one, and the signal to the reversible counter 15 is not BE. If the transmission of information from input accumulator 1 to output accumulator 20 is enabled, control unit 9 outputs a signal to input 35 of reversible counter 15 to subtract one from the contents of counter 15, provided that in register 8 the corresponding bit is in state one.

After the operations have been done, the following input drives 1 are polled to the last, and they are served similarly.

After the completion of the first polling cycle, the contents of the corresponding bits of register 8 through the open INPUT group 22 of the BANNER 23 elements enter the prohibitory inputs of group 24 of the BANE 25. 25. If the contents of the bit of register 8 are equal to one, the corresponding BAN 25 will close and prohibit interrogation of the corresponding input accumulator 1 by the interrogation unit 21. If the contents of register bit 8 is equal to zero, the corresponding entry BAN 25 opens and the corresponding input accumulator 1 is serviced in a way.

When transmitting information from the input drives I to the output drives 20, an analysis of the presence of a signal at the end of the message is carried out. When one of the output accumulators 20 is released, the signal of the end of the message is output to the first input of the corresponding signal element AND 27, the second input of which receives a signal from the single output of the trigger 26. If the single output of the trigger 26 is in the state of one, this means that output drive 20 to it made the appeal one of the input drives 1 and was refused. In this case, the corresponding signal element AND 27 opens, and the signal of the end of the message enters control unit 9, while simultaneously returning the corresponding trigger 26 to the zero state.

When a signal arrives, the end of the message to control block 9 means that from this point on, the priority of messages stored in the reversing counters 13-15 must be taken into account and to interrogate all input accumulators. For this, control block 9 outputs a signal at output 37, opening elements AND 16-18 and at the same time closing all elements of the prohibition 23.

At the same time, in block 21 of the poll, the number of the output accumulator 1 is memorized, during the service of which the signal for the end of the message was received. Upon further polling of the same input accumulator 1, the polling unit 21 generates a signal at the end of the cycle, according to which And 16-19 closes and at the same time all BAN 23 elements open.

After the transfer of the address blocks to the memory of the control block 9, the numbers of the input storage device 1 and the output storage device 20 producing the exchange are recorded, i.e. there is a consolidation of drives.

The invention makes it possible, in comparison with a known device, to significantly increase the speed of servicing messages, and using it in Data Exchange Systems and Message Switching Devices will shorten the switching time and message processing, since a failed message is not polled and processed until one of the requested messages is released. output drives.

The invention, compared with the known devices for the priority servicing of messages, provided a higher technical and economic effect due to the reduction of the service time of the messages. Introducing the trigger elements of the signal elements and the two groups of the BANNER elements eliminates the need for multiple polling of the input drives, if the required output drive is occupied, or when there is a signal about the release of the output drive, which was not addressed by the input drive, which significantly increases the speed of message service.

Claims (1)

Invention Formula A device for priority service of messages containing input drives, the first, second, and third priority outputs of which, through the first, second, third blocks of the OR elements, are respectively connected to the first inputs of the first, second, third OR elements, respectively; the block of elements OR is connected to the indicator outputs of the input drives, register.