RU1797120C - Device for checking decoders - Google Patents

Abstract

The invention relates to computer technology, namely to diagnostic devices and can be used for .. i -t- 7.; - SHWkVIUii-SV-2-I 1 .- H control the correct operation of the decoders. The device contains the first element OR 1, the first - fourth elements MAJORITY 2-5, the second - fourth elements OR 6-8, the display unit 9, containing the code converter 10 and indicator 12, the AND-NOT 13 element, mode setting unit 14. The device for monitoring the decoders has an increased accuracy of monitoring by expanding the class of detected faults and localizing the fault location to within a group. 2 ill.

Description

The invention relates to computer technology, in particular to diagnostic devices, and can be used to control the correct functioning of the decoders.

The aim of the invention is to expand the class of faults detected and to increase the accuracy of fault localization.

Figure 1 presents the functional diagram of the device; figure 2 - diagram of the display unit.

The device for controlling the decoders contains the first element OR 1, the first - fourth elements MAJORITY 2-5, the second - fourth elements OR 6-8, the display unit 9, which contains the code converter 10, resistors Hi- 117, indicator 12: element And- NOT 13. mode setting node 14. containing a key 15 and a resistor 16, information inputs of the device 17- | -17z.

The device operates as follows.

MAJORITY 3-5 elements provide control over the appearance of the log. G at more than one of its inputs. The occurrence of log.1 at the inputs of more than one of the elements MAJORITY 3-5 is controlled using the element MAJORITY 2. The output of the element OR 1 generates an error signal (log.1), which is fed to the second input of the element 13 AND-NOT, at the first input of which there is a log.T.

At the output of the AND-NOT element 13, a log O is generated, which is fed to the control input of the code converter 10 of the display unit 9 and extinguishes the indicator 12. The extinction of the indicator 12 indicates the occurrence of log 1 on more than one of the inputs 17.

To localize the malfunction, press key 15. As a result, the log.O goes to the first input of the AND-NOT 13 element, from the output of which the log goes to the control input of display unit 9. 1, as a result of which the indicator lights up and displays one of the following digits

1 - malfunction in group 17t,

2 - malfunction in group 172.

3 - malfunction in groups 17i and 172.

4 - malfunction in group 17z.

7 - malfunction in groups 17 ..

the code of which comes from the outputs of the second or fourth elements OR 5-8 to the inputs of the converter 10.

Thus, there is a localization of the fault location accurate to the group.

Consider the correct operation of a controlled decoder when the log. 1 appears only at one input of one of the elements MAJORITY 3-5. At

this at their inputs and outputs of the first element OR 1 there is no error signal. The first input of the AND-NOT 13 element receives log.1, because key 15 is not pressed. To the second input of the AND-NOT 13 element from the output

the first element OR 1 receives the log.O. As a result, the output is received from the output of the AND-NOT 13 element to the control input of the display unit 9. D, the indicator 12 lights up and displays a sequential alternation of numbers 1-2-4, the code of which comes with the output of the second or fourth elements OR 6-8 to the inputs code converter 10 during cyclic movement of only one log.1 at the outputs of the controlled decoder - inputs of the control device in groups 171-17z.

Consider the following malfunctions of a controlled decoder:

At one of the outputs controlled

- there is a decoder log. 1, which does not move, although the input code changes from 000 to 111, i.e. fault stopped with one.

One log. 1 in one of the input groups 1 1-17 of the control device characterizes its correct operation. Therefore, at the output of the first element OR 1, there is no error signal (log. 1),

The signal log, O comes from its output to the second input of the AND-NOT 13 element, from the output of which log. 1, to the control input of the display unit 9, indicator 12 lights up, on which one will be displayed

numeral:

1 - malfunction in group 17i, 2 - malfunction in group 172, 4 - malfunction in group 17z. The digit code comes from the outputs of the fourth-fourth element OR 6-8 to the inputs of the code converter 10 of the display unit 9.

Thus, the malfunction of the controlled decoder stopped with one is characterized by a stopped digit on the indicator 12 of the display unit 9.

At all outputs of the controlled decoder there is a log.O, i.e. Log.1 is absent, although the input code 000 to 111 changes at the inputs of the controlled decoder. malfunctioning disappeared unit.

V-3

As in the first case, there is no error signal (log. 1) at the output of the first element OR 1, which leads to the illumination of indicator 12, which will display the digit O, the code of which comes from the outputs of the second or fourth elements OR 6-8 to the inputs Converter 10 code block display 9.

Thus, a malfunction of the controlled decoder of the disappeared unit is characterized by the display of the digit O on the indicator 12 of the display unit 9.

Formula of the invention

Decoder control device containing four MAJOR elements, four OR elements. moreover, the first, second and third inputs of the first MAJORITY element and the first OR element are paired and connected to the first group of information inputs of the device, the first, second and third inputs of the second MAJORITY element and the second OR element are paired and connected to the second

and

group of information inputs of the device, the first, second and third inputs of the third element MAJORITY and the third element OR are paired and connected to the third group of information inputs of the device, the outputs of the elements MAJORITY from the first to the fourth are connected to the inputs of the fourth element OR, the outputs of the first, second and third

10 elements OR connected to the inputs of the fourth element MAJORITY. about t-different topics. that, in order to expand the class of detectable faults to increase the accuracy of localization

15 malfunctions, an AND-NOT element, a mode setting node, an indication unit are inserted into it, and the input of the mode setting of the indication unit is connected to the output of the AND-NOT element, the first input of which is connected to the output

20 of the mode setting unit, the second input of the AND element is NOT connected to the output of the first OR element. the first, second, third information inputs of the display unit are connected to the outputs of the second, third, 25 fourth elements OR, respectively.