Dual-mode redundant fault-tolerant method based on programmable device

Abstract

The invention provides a programmable device-based dual-mode redundant fault-tolerant method. The method comprises the following steps: mapping a circuit to a lookup table, extracting redundant circuit information from the lookup table, and establishing a circuit topological structure according to the redundant circuit information; calculating the fixed fault propagation probability of the output end of the lookup table according to the circuit topological structure, and saving the fixed fault propagation probability in a database of the circuit topological structure; calculating a preset number of lookup tables according to the fixed fault propagation probability; reinforcing the programmable device according to the preset number of lookup tables. According to the programmable device-based dual-mode redundant fault-tolerant method, the reliability of a circuit can be improved.

Description

technical field [0001] The invention relates to the technical field of digital system fault tolerance, in particular to a dual-mode redundant fault tolerance method based on programmable devices. Background technique [0002] Programmable devices have the characteristics of short development cycle, low cost, and high flexibility, and are widely used in electronic system design. FPGA chips based on SRAM configuration, the realization of its functions depends entirely on internal configuration data. FPGA devices based on SRAM type are in The space radiation environment is susceptible to single event upset (Single Event Upset, SEU), so SRAM-based FPGA system design should focus on single event upset. [0003] At present, the more mature fault-tolerant technology of programmable devices is redundancy with timing refresh, and the more common redundancy technology is triple-mode redundancy, which is to copy the original circuit three times. The correct result is output by compari...

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Problems solved by technology

[0003] At present, the more mature fault-tolerant technology of programmable devices is redundancy with timing refresh, and the more common redundancy technology is triple-mode redundancy, which is to copy the original circuit three times. The correct result is output by comparison, but the triple-mode redundancy technology has the problem of excessive circuit overhead

[0004] In order to save the circuit overhead in the triple-mode redundancy technology, the output of the protected circuit part is connected to the voter, and the rest of the circuit keeps the original connection structure. This method can reduce the overhead appropriately, but it will reduce the reliability of the circuit. sex

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