SU1332385A1 - Device for checking the fixed storage - Google Patents

Abstract

The invention relates to computing and can be used to improve the reliability of semiconductor LSIs of permanent memory devices with multi-bit organization. The aim of the invention is to simplify the device. The device comprises a coding block 1, a selector 4, a switch 7, particular drivers 9, 11, and a block 13 of majority elements. The device uses a modified Reed-Muller code check matrix. 3 nl V

Description

one

The invention relates to computing and can be used to increase the reliability of semiconductor LSIs of permanent storage devices with multi-bit organization.

The purpose of the invention is to simplify the device.

Figure 1 shows a diagram of a device for monitoring a fixed memory; Figures 2 and 3 show the check matrix of the code (23; 16) and the specific implementation of the coding block, the switch, the first and second parity drivers dn of this code.

The device (Fig. 1) contains a block: 1 coding, control 2 inputs and 3 information bits, selector 4 with control input 5, input 6 of the byte sample, switch 7 with information inputs 8, first parity generator 9, inputs 10 of the first group second parity generator 11, inputs 12 of the first group, block

13 major elements, its inputs

14 and 15, respectively, of the second and third groups and exits 16.

The device uses a modified Reed-Muller code check matrix (Fig. 2). In the example of the specific implementation (), a device dp is considered to work with 16-bit information words read from the ROM accumulator and output 8-bit words to the BIS ROM output. In Fig. 3, there are two addition elements 17, 23, AND-OR elements 24 and 25 and EXCLUSIVE OR elements 26 - 41.

The device works as follows.

When reading, the signals of the information 3 and check 2 bits from the block of permanent memory (not shown) are sent to the selector 4 and the coding block 1, at outputs 8 of which control ratios C, are formed. applied code (phi g, 2).

Along with this, depending on the signal at the input 5, the selector 4 allocates to its outputs 12 the readable n & the first byte (bit

 one-"

) or second byte (bit

3 .. ,,) which is fed to the inputs of the first group of the block of 13 majority elements and the inputs of the second group of the first 9 and second 1I drivers and metrics. On inputs 8 of the first group

block 9 receives signals from the outputs of block 1 (Cj.-, code of figure 2), and inputs 10 of the first group of block 11 receive signals from the outputs of switch 7 (C., Cj or Cj, C for code of figure 2) in depending on the signal from input 6, i.e. the output 16 of the device asks for the first or second byte of information. Thus, the inputs of the first 12, second 14 and third 15 groups of the block of the majority of the elements receive signals that implement a system of separated control ratios in the majority decoding. For example, the value of the characters in the first digit de

In this case, since any signal a, enters no more than once into each system, any single error violates no more than one equation and the error-free value of the read signal is determined in block 3 by means of the majority element on three inputs. Formula invented rf

6

0

five

0

five

A device for monitoring a fixed memory, comprising a coding unit, the inputs of the first group of which are the control inputs of the device, the inputs of the second group are. information inputs of the device and connected to the corresponding inputs of the selector, the control inputs of which are the inputs of the device byte sampling, and the outputs are connected to the inputs of the first group of the block of the majority elements, the outputs of which are information outputs of the device simplify the device, a switch, the first and second parity generators are entered into it, and the outputs of the coding block are connected to the inputs of the first group of the first parity generator and to the information inputs s switch control inputs are connected to inputs of the sampling device byte, and outputs connected to inputs of the first group of the second formi31332385

The parity encoder, the inputs of the second corpses of the second and third groups of the block of which are connected to the inputs of the second elements, are connected by the corresponding group of the first generator with the outputs of the first and secondary and to the outputs of the selector, the parity formers.

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Editor S. Pekar

Fi.5

Compiled by O. Isaev Tehred L. Serdyukova

Order 3839/48

Circulation 589 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Proofreader S. Cherni

Claims (2)

Formula invented A device for monitoring read-only memory containing an encoding unit, the inputs of the first group of which are the control inputs of the device, the inputs of the second group are information inputs of the device and are connected to the corresponding inputs of the selector, the control inputs of which are inputs of the sample byte of the device, and the outputs are connected to the inputs of the first group of the unit majority elements, the outputs of which are information outputs of the device, characterized in that, in order to simplify the device, commu the ator, the first and second parity drivers, the outputs of the coding unit being connected to the inputs of the first group of the first parity driver and to the information inputs of the switch, the control inputs of which are connected to the sampling inputs of the device byte, and the outputs are connected to the inputs of the first group of the second parity generator 1332385, the inputs the second group of which is connected to the inputs of the second group of the first parity generator and to the outputs of the selector, the inputs of the second and third groups of the block of majority elements are connected respectively with the outputs of the first and second parity formers. a 1 a! aS aS aS a3 aS aza tt απαβαΐίαΗαΰανα POIADAaIaLagZ y / y II / ~ ⁷⁷⁷ | UU U / U I / / U U / U At y U u At UU At U / U / At U u At Nuit 2! Oyt Fig-2 Figure 1