SU1282132A1 - Unit for checking integrated circuits - Google Patents

Abstract

The invention relates to the field of computing technology and can be used in the development of integrated circuits as. built-in control element. The aim of the invention is to increase the reliability of the control node. In the node for controlling integrated circuits by the equilibrium of signals at the information inputs, a single signal is generated at the output of the health of the node, and the code at the control outputs of the node repeats the input code. When the signals at the information inputs of the node are unequal, a zero signal is generated at the output of the node health, and the code at the control outputs of the node is inverse with respect to the input code. Inversion of the input code with the inequality of the input signals makes it possible to increase the reliability of the control. 2 ill., 1 tab. I (L

Description

The invention relates to sophisticated technology and can be used in the design of integrated circuits as an embedded control element.

The aim of the invention is to increase the reliability of the control node.

FIG. 1 shows a functional block diagram for controlling integrated circuits; in fig. 2 - a variant of the construction of a node on MOS transistors.

The node for controlling integrated circuits (Fig. 1) contains informational inputs 1-3 of the node, elements 4-7 of equivalence, output 8 of the health of the node and control outputs 9-11 of the node.

FIG. 2 denotes a voltage divider 12, a supply voltage bus 13, a zero potential bus 14, MOS transistors 15-44.

The node for controlling integrated circuits works as follows.

When applying to the first 1, second 2 and third 3 information inputs of a node of three one-digit numbers at the outputs | 8-11 of the node, signals are compared to the input numbers in accordance with the table.

As can be seen from the table, when the input signals are equal, the output B of the health of the node produces a single signal, and the control signals. Outputs 9-11 of the node. The input signals pass unchanged.

If the input signals are not equal, a zero signal is generated at the node health output 8, and the inverted input signals are present at the control outputs 9-11 of the node.

Such a construction of a node for controlling integrated circuits makes it possible to increase the reliability of the control. The control of equality of input signals not only by the signal at the output of 8 is-. the equality of the node, but also by comparing the signals, for example, at the information input 1 of the node and at the control output 9 of the node, allows detecting a malfunction even if the connection between the output of the first equivalence element 4 and the output 8 of the node is faulty. So you can increase the reliability of control.

The need to use such a node to control integrated microns

This is due to the fact that inside the integrated circuits there are often single-type nodes, for testing of which the same tests are used.

The node for controlling integrated circuits, built on MOS transistors (Fig. 2), works as follows.

Let the information inputs 1 and 3 of the node receive single signals, and the information input 2 of the node - a zero signal. In this case, transistors 16, 18, and 20 of the first equivalent element 4 are open, and transistors 17, 19, and 21 are closed, and a high potential (logical zero) is formed at the output 8 of the health of the node. The same signal arrives at the first input of the second equivalence element 5 and opens the transistor 26 (the transistor 23 is closed in this case). At the same time, the second and third inputs of the second element of equivalence receive a single signal from the information input 1 of the node, which opens transistors 24 and 25. Transistors 27 and 28 in this case are closed. No current flows through the circuit and, therefore, a high level potential (logical zero) is formed at the output 9 of the node. The zero signal from the output of the first equivalence element 4 arrives at the first input of the third equivalence element 6, the remaining inputs of which receive a zero signal from information input 2 of the node. In this case, current flows through the transistors 33-35, and a low signal level is formed at the output 10 of the node, corresponding to a logical unit.

In addition, the zero signal from the output of the first equivalence element 4 arrives at the first input of the fourth equivalence element 7, the remaining inputs of which receive a single signal from the input 3 of the node. In this case, transistors 38-40 are open, and transistors 37, 41, and 42 are closed, and a signal corresponding to a logic zero is output from the node output 11.

Thus, with the inequality of the input signals, the input signals at the outputs of the 9-11 node were inverted.

Claims (1)

Invention Formula A node for controlling integrated circuits containing the first element of equivalence, wherein the inputs of the first element of equivalence are information inputs of the node, the output of the first element of equivalence is the output of the health of the node, a role, three elements of equivalence are entered into it, and the output of the first element of equivalence is connected to the first inputs of the second, third and fourth elements of equivalence, the first, second, and third information inputs of the node are combined with the second and third inputs of the second, third and fourth elements of equivalence, respectively, the outputs of which are controlled by the control outputs of the node. . / N1  §