SU1444798A1 - Arrangement for data exchange between subscribers - Google Patents

Abstract

The invention relates to computing and can be used for organizing the exchange of information between subscribers of the writing system. The aim of the invention is to increase the reliability by providing the hardware control of the receiving and transmitting parts. The device contains a generator of clock pulses, a counter, a register, a reference element, four triggers, three AND elements, an OR element, a single vibrator, two main transmitters, and two main receivers. 1 il.

Description

   h

00

The invention relates to computing and can be used to organize the exchange of information between subscribers of a computing system.

The aim of the invention is to increase the reliability by providing hardware control of the receiving and transmitting parts.

The drawing shows a block diagram of the device.

The device for data exchange contains a counter 1, an element OR 2, a register 3, a one-shot 4, triggers 5-8, a comparison element 9, elements 10-12, main transmitters 13, 14, main receivers 15, 16, subscriber backbone 17, a common data bus 18, common bus 19 synchronization, input 20 Read, input 21 Write, generator 22 clock pulses, input 23 Reset, input 24 Read flag.

The operation of the device is as follows.

Before the operation begins, the initial setup of the triggers 5, 6 to the zero state is carried out by the signal at input 23 Reset. The input signal 21 records the installation of the counter 1 in the initial state, the triggers 6, 7 into a single state and the recording of information with the master. 17 to register 3. Clock pulses from generator 22 are sent to the synchronous input of trigger 5, from the output of which through the trunk transmitter 14 are sent to the common synchronization bus 19 and to the synchronous input of the trigger 8. From the common synchronization pin 19, clock pulses through the trunk reception - Nick 16 is received, on the synchronous input of the counter 1, the synchronization input of the register 3 and on the one-shot 4, produced by the strobe on the falling edge of the pulse. With the serial output of the register 3 data is fed to the input of the trigger 8 and through the main

transmitter 13 is for common data bus 18. From the common data bus 18, through the trunk receiver 15, data is fed to the serial input of register 3 and the reference element 9. The second input of the comparison element receives data from the output of the trigger 8. In case of inequalities in the pulse at the output of the one-shot 4 through the element

And 10, the trigger 7 is set to the zero state.

Upon completion of the word transfer, the counters 1 of the receiver device and the transmitter device produce an overflow signal which sets the trigger 6 to the zero state. The reading of the received word by the receiver and the writing of a new word intended for transmission are made after the process reads the zero state of trigger 6. The state of trigger 6 is read through element 11.

The signal at input 20 (Read) sets the count 1 through the element OR 2 to the initial state and from the register 3 transmits the received information to the line 17.

Thus, the transmitted data in the serial code on the common data bus 18 and received from it are compared bit by bit and the result of the comparison, synchronized with the clock pulse, is written to the trigger 7.

With the right reception of the word, trigger 7 remains in a single state, and in the case of at least one error, trigger 7 is reset to O.

Information about the correctness of word transmission is determined by the processor according to the state of the trigger 7, the state of which is read out via the element 12 and the highway 17 according to the signal at the input 24.

Claims (1)

Invention Formula A device for exchanging data between subscribers, comprising a clock generator, counter, reg. three AND elements, two main transmitters, two microgast receivers, the information output of the first main transmitter and information input, the first main receiver being the output and input of the device for connecting to the common data bus, the information source of the second main receiver the output and input of the device to connect to a common sync bus, while the information output of the first trunk receiver n with the first information input of the register, the synchronous input of which is connected to the counting input of the counter and with the information output of the second main receiver, characterized in that, in order to increase the reliability by providing hardware control of the receiving and transmitting parts, four triggers are entered into it, comparison, the one-oscillator, the OR element, the second information input and the first information output of the register being the input and output of the device for connecting respectively to the information output and the subscriber's information input, the outputs of the first and second elements AND are the device outputs for connecting to the ready input and the subscriber error input, the register reading input is connected to the first input of the OR element and is the input of the device dp connecting to the subscriber reading output, the register record input with single inputs of the first, second triggers, with the second input of the OR element, with the first installation input of the counter, and is the device input for connecting to the subscriber's recording output, zero input ne Vågå trigger is an input device for podklk) Cheney to the mounting subscriber output, a first input of the first AND element is connected to a first input The second element And is the input of the device for connecting the subscriber's flag to the output, while the output of the OR element is connected to the second installation input of the counter, the overflow output of which is connected to the synchronous input of the first trigger, the output of which is connected to the second input of the first element And with zero input of the third trigger, the output of which is connected to the information input of the second main transmitter and with (synchronous input of the fourth trigger, 5 whose output is connected to the information input of the first trunk transmitter and to the first input of the comparison element, the second input and output of which are connected respectively to the information output of the trunk receiver and to the first input of the third element And, the second input of which is connected to the output of the one-vibrator, the trigger input of which connected to the information output of the second trunk receiver, the output of the third element I is connected to the zero input of the second trigger, the output of which is connected to the second input of the second el ement and 0 the second information output of the register is connected to the information input of the fourth trigger, the synchronous input of the third trigger is connected to the synchronous clock of the clock generator.