SU1622857A1 - Device for checking electronic circuits - Google Patents

Abstract

The invention relates to automatic control and can be used to monitor and diagnose digital electronic circuits. The purpose of the invention is to increase the reliability of the control. The device contains M groups of drivers of the control code 6, n groups of elements AND 5, control unit 7, element OR 8 and counter 9. The purpose of the invention is achieved by ensuring that the obtained control codes depend on all characters of the output sequences of the control object. 2 Il. 9% l

Description

The invention relates to automatic control and can be used to monitor and diagnose digital electronic circuits.

The purpose of the invention is to increase the credibility of the control.

Figure 1 shows the block diagram of the device for the case where M is the number of groups of drivers of the control code (signature drivers); 2 is a control block diagram.

The device is designed to compress diagnostic information and form control codes that characterize the technical state of individual components of the checked electronic circuit, as well as the control code of the circuit as a whole. In the case of, for example, the M 3 shapers of the first group characterize the state of individual blocks, the shapers of the second group — the individual devices of the circuit; the shaper of the last group characterizes the technical state of the entire circuit as a whole.

The device contains n groups of information inputs 1 .1, ..., 1. w., input 2 of the control signal determining the processing interval of the monitored sequences, i.e. measurement window, reset input 3, clock input 4, n And 5.1, ... element groups, .... , M groups of drivers of control code 6.1, ..., 6.M, control block 7, element OR 8, counter 9. The outputs of the device are the outputs of all drivers 6 of the control code.

Yes.

Control block 7 (FIG. 2) contains the first element AND-NOT 10, the first ment AND 11, the second element AND-NO 12, the third element AND-NO 13, the second element AND 14, the element OR 15, the first 16 and the second 17 triggers .

Information inputs 1.1, ..., 1. connected to the first inputs of the elements

And 5.1, ..., 5 ..

the outputs of which are connected to the inputs of the formers 6.1 of the first group. The second inputs of the elements And 5.1, ..., 5. connected to the first output of the control unit 7, the second output of which is connected to the first input of the counter 9, the third output connected to the clock inputs of the drivers 6.1, ..., 6.3, the fourth output connected to the installation inputs of the generator 6.1, ..., 6.3 . Input 2 control5

ten

15

0

five

thirty

35

40

45

50

55

It is connected to the third input of the control unit 7, the clock input 4 is connected to the fourth input of the control unit 7. The reset input 3 is connected to the second input of the control unit 7 and the first input of the element OR 8.

The output of the element OR 8 is connected to the first input of the control unit 7 and the second input of the counter 9, the output of which is connected to the second input of the element OR 8,

Before the start of operation, the signal at input 3 is set to the zero state of trigger 16 and 17 and the counter 9. The outputs of elements 14 and 15 are high, therefore the arrival at input 2 of the control signal defining the measurement window of controlled sequences switches the triggers 16 and 17 in the unit states that determine, respectively, the processing interval of the monitored sequences and the generation interval of the control code.

A single state of the trigger 16 opens the elements And 5.1, ..., 5.p. The arrival of the next signal at input 2 switches the trigger 16 to O, since the output of element 15 at this moment is high. The trigger 17 remains in a single state, since the output potential of the element 14 is low potential, the blocking element 12. The zero potential from the output of the trigger 16 blocks AND5 elements, closing the measurement window, however, the control code generation process does not end there. The zero potential at the output of the trigger 16 in the single state of the trigger 17 causes the appearance at the output of the element 13 of the sequence of pulses arriving at the clock input of the counter 9.

The overflow signal from the output of the counter 9, having passed through the element 8, resets the trigger 17 to the zero state, thereby terminating the process of forming the control code. Comparing the obtained control codes with the reference ones, they determine the technical state of the object of control.

In order to ensure the unambiguity of the control codes received, at the beginning of each interval of the formation of the control code, the signal from the output of the element 12 is set to the zero initial state of the registers of all drivers 6 of the control

five

code. The conversion factor of counter 9 is selected so that all the distortions of the bits of the registers of drivers 6.1 (if there are distortions in controlled sequences) that are not connected with the inputs of drivers of the next group are turned on at those outputs that are connected to the inputs of drivers 6.2 next group.

By ensuring the dependence of the control code formed in the 6.M shaper (characterizing the technical state of the control object as a whole) from all characters of the monitored sequences received at the inputs 1.1, ..., 1, the control reliability is improved.

So, if the length of the monitored sequences is 64, M 5, p 32, and the control code width is 16, then the proportion of distortions of the input sequences detected in the 6.M shaper is equal to

() 0.999,

When using the known device this dol will be only

Claims (1)

(1 - ()) ° 937 The formula of the invention A device for controlling electronic circuits containing M groups of I 0 five eight 0 five five 57 control code drivers and a control unit, with the outputs of the i-group control code formers of the i-th group connected to the information inputs of the control code formers of the (1 + 1) -th group, where i is 1, ..., M-1, the outputs of the control code formers of the control code with the outputs of the device, characterized in that, in order to increase the reliability of the control, the groups of elements i are entered into the device according to the number of drivers of the first group control code, the element OR, and the counter, and the information inputs of the device are connected to the first inputs of elements AND, the second inputs of which are combined and connected to the first output of the control unit, the second output of which is connected to the first input of the counter, the second input of which is connected to the first input of the control unit and the output of the OR element, the first input of which is connected to the second input of the control unit and the reset input of the control unit The main and clock inputs of the device are connected respectively to the third and fourth inputs of the control unit, the third and fourth outputs of which are connected respectively to the clock and installation inputs of the driver control code, the output of the counter is connected to the second input of the OR element, the outputs of the AND elements are connected to the inputs of the corresponding drivers of the control code of the first group. Fie.2