SU1716572A1 - Redundant memory - Google Patents

Abstract

The invention relates to computing and can be used to build memory systems of increased reliability. The aim of the invention is to increase the reliability of diagnosing a backup storage device by providing independent testing of all elements of the system. The device contains a decoder 1. the first 2 and second 3 memory modules, the control unit 4 by the switch, the switch 5, the first b and the second 7 control units. The purpose of the invention is achieved in that a descrambler and a switch control unit are inserted into the redundant storage device circuit, with the help of which it becomes possible to test each of the memory modules separately, as well as to check the embedded control units. 2 Il., 1 tabl,

Description

The invention relates to computing and can be used to build memory systems of increased reliability.

A device is known comprising two memory modules, a decoder and two elements. 2 and 1. Information is recorded simultaneously in both memory modules, which ensures that the information stored in them is identical. Information from only one memory module is read. If it fails, it reads from the second memory module. The drawback of the device is the lack of built-in monitoring tools, which requires additional time to check the truth of the read information and switch to another memory module in case of an error.

The closest to the proposed device is a device comprising two memory modules, control units, a switch, input buses, output buses, an error signal output bus, and the outputs of the memory modules are connected to the output bus through a switch controlled by control units 2.

In this device, the input information is recorded in both memory modules in parallel. The readout is performed from the output of one of the memory modules through the switch. If the control unit detects an error in the memory module, the switch switches the output bus to the second drive, and a corresponding signal appears on the error signal output bus.

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A disadvantage of this device is that in the event of a failure, localization of a malfunction in it is difficult due to the impossibility of separate verification of the memory modules, as well as the impossibility of verifying the means of control.

The aim of the invention is to increase the reliability of diagnosing a backup storage device by providing independent testing of all elements of the system.

This goal is achieved by the fact that the device containing the first and second memory modules, the inputs of the address, data and write control are read which are connected respectively to the common input address and data buses and write-read control, information outputs of the first and The second memory modules are the inputs of the first and second control units, respectively, and the first and second information inputs of the switch, the output of which is the output information bus, respectively, the decoder and the control unit are entered switching, the first and second inputs of the decoder are connected respectively to the first and second outputs of the device control mode bus; the first, second and third outputs of the decoder are respectively the first, second and third inputs of the control unit of the switch, the fourth output of the decoder is connected to the control inputs of the control units The outputs of which are connected to the fourth and fifth inputs of the switching control unit, the first and second outputs of which are the control inputs of the switch, the third output of the unit switch control is the output of a device error signal,

A comparative analysis with the prototype shows that this device is distinguished by the presence of new units: a decoder and a switch control unit and their connections with the rest of the circuit elements. Thus, this device meets the criterion of novelty.

A comparison of the proposed solution with other technical solutions shows that the proposed device has a new technical property, which consists in increasing the reliability of diagnosing a backup storage device by checking the drives and self-monitoring tools separately. Therefore, this technical solution meets the criterion of significant differences.

Figure 1 shows a diagram of a backup storage device; 2 shows an example of implementation of a switch control unit.

The device (Fig. 1) contains the decoder 1, the first and second memory modules 2,3, the control unit of the switch, the switch 5, the first and second control units 6,7, the input information, address and control write bus - read 8 , the first 9 and second 10 inputs of operating mode control, the first to fourth 11-14 outputs of the decoder, output buses 15.16 of the first and second memory modules, outputs 17.18

5 of the first and second control units, the first and second outputs 19, 20 of the control unit of the switch, the output bus 21 of the device, the output 22 of the error signal.

The control unit 4 switch (figure 2) (

0 contains element 2 OR 23, two elements EXCLUSIVE OR 24.25, element 2 OR 26, two elements ZI 27.28, element 2 and 29. The control unit of the switch is connected to the first, second and second inputs 11, 12, 13

5 to the third outputs of the decoder 1, to the inputs 17, 18 to the outputs of the first and second blocks 6,7, to the outputs 19,20 to the control inputs of the switch 5, to the output 22 to the output of the device error signal.

0

The device operates in four modes, depending on the signals at the control inputs 9.10 modes of operation of the device. Writing information to the memory modules during

5 of all four modes is as follows. On the bus 8 in the device post; the address and control information, as well as the data that is written in parallel to both memory modules, are stored. Procedure

0 reading depends on the mode in which the device operates. Writing off modes of operation is given in the table.

In the first mode, the output 11 of the decoder 1 establishes a log.O and the control unit 4 of the control 4 passes the control signals from the control units 6.7 to the switch inputs 19.20 through the elements 23.27 and 26.28. If an error occurs in one of the modules, the output of the corresponding control unit is an error signal (lot level H). If the error signal came from the control unit of the module that is connected to the output 21 of the device, the switch will connect to the output

5, the device is another memory module. In the event of an error, the switch module that is not connected does not occur. If there is a simultaneous error in both memory modules at the output 22 of the element 2I 29, the error signal is given (log level 1).

In the second and third modes log. O appears, respectively, at outputs 12 and 13 of the decoder, switch 5 through the switch control unit. Tightly connects to the output, respectively, the first 2 or second 3 memory modules, regardless of the control signals at the outputs 17.18 of the control units 6.7. Thus, in the second mode, the information is always output from the first memory module, and in the third mode - from the second memory module. Separate testing consists in software testing of memory modules and generating and recognizing the error distributions of each of these modules.

The fourth mode is necessary to check the means of detecting errors in the memory modules, i.e. control blocks 6 and 7, and the fact of an error is detected by an error signal at the output 22. In this mode, the output 14 of the decoder 1 is set to a log. O, which simulates an error in the control blocks 6 and 7, thus, when the control blocks 6 and 7 are faulty output 22 should have an error signal.

Compared with a device of similar purpose (prototype), the device claimed has a more reliably diagnosed structure, which makes it possible to accurately determine the failed element of the device, reduces the time and cost of eliminating failures of system elements.

Claims (1)

Claims of the invention A redundant memory device containing the first and second memory modules, the address, information and control inputs of which are respectively the address, information and control inputs of the device, the information outputs of the first and second memory modules are connected respectively to the information inputs of the first and second control units and with the first and second information inputs of the switch, the outputs of which are the information outputs of the device, so that In order to increase the reliability of device diagnostics, a decoder and a control unit are entered into it, the first and second outputs of which are connected to the first and second control inputs of the switch, the first and second inputs of the decoder are inputs of controlling the operating mode of the device, the first, second and third outputs of the decoder are connected respectively with the first, second and third control inputs of the control unit, the fourth and fifth control inputs of which are connected respectively with the outputs of the first and second control units , the control inputs of which are combined and connected to the fourth output of the decoder, the third output of the control unit is the control output of the device. I 1 1 it fl 15 -V G7,   5 L #v 12 13 It / rhJ sixteen 18 22 w. ABOUT & figure 1