Fixed-high and fixed-low fault injecting circuit and method for online test of digital circuit board

Abstract

The invention discloses a fixed-high and fixed-low fault injecting circuit and method for an online test of a digital circuit board. The circuit comprises variable resistors R1 and R2, a cable assembly M, a lead wire group L, a switch K, a selection switch K1 and probes T, T1 and T2, wherein the selection switch K1 selects the variable resistor R1 or R2 to be electrically connected with a power supply pin or a grounded pin of a digital circuit chip, is communicated with the probe T through the controlling of the switch K and then is connected with an input signal pin of the digital circuit chip, so that the variable resistor R1 or R2 is electrically connected with a line between the input signal pin of the digital circuit chip and the power supply pin or the grounded pin of the digital circuit chip; the resistance value of the variable resistor R1 or R2 is adjusted from big to small until the input signal pin has the fixed-high or fixed-low fault; and then, the adjustment of the resistors is stopped and the fault injection is successful. The fixed-high and fixed-low fault injecting circuit and method for the online test of the digital circuit board can realize single-path or multi-path continuous or discontinuous fixed-high or fixed-low fault injection of the input signal pin of the digital circuit chip and meet the technical requirements of testability experiments.

Description

technical field [0001] The invention relates to the technical field of testing experiments, in particular to a solid high solid low fault injection circuit and method for on-line testing of digital circuit boards. Background technique [0002] Fault injection is the key link of electronic system testing technology. It is to artificially inject faults into the target electronics with built-in test (BIT) function by using a certain strategy according to the pre-selected fault model under the premise of ensuring the safety of the electronic system. In the system, by observing and analyzing the response of the built-in test of the target electronic system in the case of fault injection, the required qualitative or quantitative evaluation results can be provided for the test. [0003] At present, the fault injection technologies for electronic systems are mainly classified into: fault injection of the external bus of the electronic system, fault injection of the connection betwee...

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Problems solved by technology

[0004] Therefore, how to provide a safe and effective fault injection method for online testing of digital circuit boards and solve the problem that the existing technology is difficult to verify the testability of electronic systems is a very valuable research

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