SU1476478A1 - Unit for connecting subscribers to common bus - Google Patents

Abstract

The invention relates to computing and can be used to build reliable computing systems based on the principle of a common highway. The device is connected between the common trunk of the computing system and each of its functional blocks that interact through the common trunk, and allows for the correction of single failures of the transmit and receive paths of the common highway, including the transmission and reception equipment, to increase the reliability of information exchange. The device contains a control unit and a group of transmitting / receiving blocks according to the number of information digits of the main line plus a check bit, with the control unit containing two delay elements, a pulse shaper, a trigger, two modulo-two adders, three amplifiers-transmitters and three amplifiers-receiver, and each the receiving and transmitting unit is two elements EXCLUSIVE OR, the amplifier-transmitter and the amplifier-receiver. An increase in the reliability of information exchange is achieved by using modulo-two adders that control the transmitted code directly at the inputs of the information bits of the transmitting device and at the outputs of the information bits of the receiving devices. In this case, all single failures of transceiver information paths are corrected, including failures of EXCLUSIVE OR elements, amplifiers, transmitters, and amplifiers / receivers of transceiver units, and failures due to line breaks. 1 il.

Description

one

The invention relates to computing and can be used to build reliable uniprocessor and multiprocessor computing systems based on the principle of a common backbone.

The purpose of the invention is to increase the credibility of information exchange,

The drawing shows a functional diagram of the proposed device.

The device contains a control unit 1, a group of transceiver units 2.1 and an additional transceiver unit 2 "2 o. The control unit 1 contains delay elements 3 and 4, a pulse shaper 5, a trigger 6, a second and first modulators 7 and 8 modulo two, a first amplifier 9 and the first, second amplifier-transmitters 10 and And, the second and third amplifiers receivers 12 and 13, the third amplifier transmitter 14, Transmit-receiving units 2 contain the elements EXCLUSIVE OR 15 and 16, the amplifier-receiver 17 and the amplifier-transmitter 18 "

In addition, the device contains lines 19-30 of communication with the trunk and external devices,

The device is connected between the common backbone of the computing system and each of the main functional blocks of the system (blocks interacting via the backbone). Thus, the number of devices in the system is equal to the number of system units

The device works as follows.

At any time, all the devices included in the system’s trunk are in the state of receiving information and only one of them, namely the device connected

with the main message source block - in the state of receiving and transmitting information

The main source information block supplies to the line 25 of the device associated with it the code of the word being transmitted, including, as a rule, bits of commands or data and the address of the recipient of information, and sets up to the line

ko21 signal Transmission resolution, which opens transmitter-amplifier P, amplifier-transmitters 18 and, through its front through shaper 5, flushes trigger 6 "O from trigger output 6 to the inputs of the EXCLUSIVE OR 16 elements in the transient state its amplifier-transmitter 11, line 27 The sign of the trunk code and the receiver-amplifiers 12 to the inputs of the elements of the LEARNING OR 16 of all devices connected to the trunk causes the word to be transmitted through the trunk in the forward code. In this case, the device OV from the output of the adder 7 through the corresponding block 2 to the line 29 Monitoring of the line, the control word of the transmitted word is generated parity

five

0

five

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five

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OR 15 enters the adders 8 all devices. At the same time, 1 from the output of the adder 8 indicates the presence of a single error in its input code, and O indicates its absence. Amplifier-transmitters 14, which are NOT open collector elements connected to the outputs by line 28 Failure of the line, realize a logical function therefore, the presence of 1 at the output of at least one adder 8 leads to the establishment in line 28 Failure O, which through the inverting amplifiers-receivers 13 sets 1 to the D-inputs of the 6 trigger all troystv. Otherwise, when all input codes of adders 8 are even, there is no single error in any of them, in line 28 Failure occurs, which through inverting amplifiers-receivers 13 sets on D-inputs of triggers O.

After issuing the transmitted word code, the source source block generates a transmission strobe signal on line 20 of the associated device indicating the true value of the transmitted word code on the device line 25. The transmission strobe signal from the device line 20 through the delay element 3, the delay time of which is determined by the entry time of all devices in the steady state, by the front, writes a signal with its input to trigger 6 if its trigger O was recorded to trigger 6, indicating that there are no faults This state of all devices does not change. In case of detecting a single error, trigger 6 will be recorded 1, which is fed to the inputs of the EXCLUSIVE OR 16 elements of the transmitting device, causing the latter to invert the code transmitted to the trunk, and through the amplifier transmitter 11, line 27 The sign of the code and receiver amplifiers 12 - the inputs of the elements- EXCLUSIVE OR 15 of all devices

In the steady-state mode, the inverting of the code received in the line 30 of the highway and the control bit transmitted to the line 29 control through the amplifiers-receivers 17 and the elements EXCLUSIVE

There are 24 data bits on the line and the inputs of the adders of the 8 most recent code from lines 30 and from line 29 Trunk control. Thus, there are 24 data bits on the line and on the inputs of the adders of the 8 last code from lines 30 and from line 29 Control of the trunk. Thus, if during the transmission in the direct code on one of the inputs of one or some of the adders 8 there was a logical signal that differs from the code value transmitted in the corresponding discharge, then in the transmission in the inverted code this discrepancy will be eliminated

Signal The transmission strobe from the output of the delay element 3 enters the input of the delay element 4, the delay time of which, like the delay time of element 3, is determined by the time all devices enter the set mode. This delay is necessary only when the transmitted and received code is inverted due to the detection of a single failure. Next, the signal Strobe transmission through the amplifier-transmitter 10 of the transmitting device, the line 26 Strobe and amplifiers receivers 9 enters the line 19 Strobe receiving

for all devices, testifying to the trunk blocks-recipients of information about its truth, At that, 1 on line 22 The transmission device’s correction indicates to the trunk block-source about the presence of a corrected failure, and 1 on the line 23 Error - about the presence of an uncorrectable failure

Since the control of transmitted codes is performed on the one hand on line 25 of the information bits of the transmitting device, and on the other on line 24 of the information bits of all receiving devices, the correction path includes faults of EXCLUSIVE OR 16 elements (except for errors inputs) and amplifier-transmitters 18 in the transmitting device, breaks in the lines of the data bits of the trunk, elements EXCLUSIVE OR 15 and amplifier-receivers 17 in the receiving devices

Claims (1)

Invention Formula A device for connecting a subscriber to a common trunk, containing a group of transceiver units, thirty 35 40 45 50 The sensors are the corresponding inputs / outputs of the device for connecting the Strobe and Common code lines to the line, the output of the third amplifier-transmitter is connected to the input of the third amplifier receiver, the output of the first amplifier receiver is the output of the device for connecting to the subscriber receiving gate , the output of the first delay element is connected to the trigger input of the trigger and through the second delay element to the input of the first amplifier transmitter, the information input of the second amplifier transmitter is connected to the output of trigger The control input is connected to the control inputs of the amplifiers-transmitters of the group's transceiver blocks and is the input of the device for connecting to the output of the subscriber's transmission resolution, the input of the first delay element is the input of the device for connecting to the output of the subscriber's receiving gate, characterized in that , in order to increase the reliability of information exchange, an additional transceiver unit, consisting of an amplifier-receiver, an amplifier-transmitter and two elements EXCLUSIVE OR, was introduced into the device, and line - pulse shaper and two adders each of which includes an amplifier module two, and in addition an receiver, an amplifier transmitter and the first element EXCLUSIVE OR, and a control unit consisting of three ten 764786 amplifiers, transmitters, three amplifiers-receivers, a trigger and two delay elements; in each transceiver unit of the group, the output of the amplifier-receiver is connected to the first input of the first element EXCLUSIVE OR, the inputs of the amplifier-receivers connected to the outputs of the amplifier-receivers of the transceiver units of a group of input-output devices for connecting to information buses of a common highway, the outputs of the first elements EXCLUSIVE OR, the transceiver units of the group form a group of outputs of the device d l connected to the information bit inputs of the subscriber, in the control unit, the inputs of the first and second amplifier-receivers connected respectively to the outputs of the first and second amplifier-15 20 five 0 five 0 five 0 The sensors are the corresponding inputs / outputs of the device for connecting the Strobe and Common code lines to the line, the output of the third amplifier-transmitter is connected to the input of the third amplifier receiver, the output of the first amplifier receiver is the output of the device for connecting to the subscriber receiving gate the output of the first delay element is connected to the trigger input of the trigger and through the second delay element to the input of the first amplifier transmitter, the information input of the second amplifier transmitter is connected to the output of trigger The control input is connected to the control inputs of the amplifiers-transmitters of the group's transceiver blocks and is the input of the device for connecting to the output of the subscriber's transmission resolution, the input of the first delay element is the input of the device for connecting to the output of the subscriber's receiving gate, characterized in that , in order to increase the reliability of information exchange, an additional transceiver unit, consisting of an amplifier-receiver, an amplifier-transmitter and two elements EXCLUSIVE OR, was introduced into the device, and line - pulse shaper and two adders There are two modules in the module, and in the additional transceiver unit the input of the amplifier-receiver is connected to the output of the amplifier-transmitter and the host thirty ъ + 30