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An Approximate Calculation Circuit Reliability Evaluation Method Based on Signal Probability

A signal probability, approximate calculation technology, applied in CAD circuit design, electrical digital data processing, instruments, etc., can solve the problems of small scope, reduced result accuracy, time-consuming and other problems, to achieve a wide range of applications, short time-consuming, Accurate effect

Active Publication Date: 2022-05-17
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For MC, it reproduces the system behavior through a random number generator, and obtains meaningful results through a large number of calculations. Since the MC method is time-consuming, the scope of application is not large, but the reliability results obtained can be used For reference, PTM is divided into traditional PTM-based and iterative PTM-based methods for evaluating the reliability of approximate circuits. The PTM method can obtain more accurate reliability prediction results and reduce the time overhead compared to the MC method, but it does not take into account In the case of fanout reconvergence, the accuracy of the results may decrease on circuits with strong signals

Method used

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  • An Approximate Calculation Circuit Reliability Evaluation Method Based on Signal Probability
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  • An Approximate Calculation Circuit Reliability Evaluation Method Based on Signal Probability

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Embodiment 1

[0037] refer to figure 1, which is an embodiment of the present invention, provides a method for evaluating circuit reliability based on approximate calculation of signal probability, including:

[0038] S1: Input the circuit netlist file, analyze the circuit netlist file, and extract the circuit connection structure information according to the content of the netlist file;

[0039] Specifically, a circuit netlist is input, the netlist file is parsed and a circuit diagram is constructed.

[0040] S2: Use standard CAD tools to obtain the signal probability of all input terminals in the circuit and the probability of different input combinations of each gate;

[0041] Specifically, given the signal probability of the original input terminal, the signal probability of the non-original input terminal under the condition of no fault in the circuit is obtained through a simulation method, that is, using a standard CAD tool.

[0042] S3: The probability and reliability of the origi...

Embodiment 2

[0077] In order to verify and explain the technical effect adopted in this method, this embodiment adopts the traditional technical scheme and the method of the present invention to conduct a comparative test, and compares the test results by means of scientific demonstration to verify the real effect of this method.

[0078] Traditional technical solutions: time-consuming and low accuracy. In order to verify that this method has higher evaluation accuracy and less time-consuming compared with traditional methods, in this embodiment, the traditional Monte Carlo method and this method will be used for approximate calculation The time and accuracy of circuit reliability evaluation are measured and compared in real time.

[0079] This embodiment has been implemented using the java language. The application example is a partial approximate adder in the EvoApprox8b library. The experimental environment is DELL XPS13 (Intel(R) Core(TM) i5-8265U CPU@1.60GHz 1.80GHz) and 8GB memory . ...

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Abstract

The invention discloses an approximate calculation circuit reliability evaluation method based on signal probability, comprising: inputting a circuit netlist file, analyzing the circuit netlist file, extracting circuit connection structure information according to the content of the netlist file; A CAD tool that obtains the signal probabilities of all input terminals in the circuit and the probability of different input combinations of each gate; initializes the probability and reliability of the original input signal of the circuit; calculates each gate based on the probability of the original input signal The reliability of the original output terminal; calculating the corresponding circuit reliability of each input combination and adding the circuit reliability obtained by each input combination to obtain the average value to obtain the reliability of the entire circuit. The method of the invention has the advantages of short time consumption, wide application range and high evaluation result accuracy when evaluating the reliability of the approximate circuit.

Description

technical field [0001] The invention relates to the technical field of reliability analysis and evaluation of ultra-large-scale integrated circuits, in particular to an approximate calculation circuit reliability evaluation method based on signal probability. Background technique [0002] With the development of integrated circuit technology, the size of devices has been shrinking and has approached the physical limit. Subsequently, the noise margin has been continuously reduced, and the susceptibility to faults (especially soft faults) has been continuously increased. more difficult. The reliability requirement of traditional circuits is that the output is error-free. In fact, many application fields can tolerate certain errors, such as image, audio, video processing, digital signal processing, wireless communication, pattern recognition and data mining. These fields include Partially wrong devices do not affect the effect, so an approximate calculation circuit suitable fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/33G06F119/02
CPCG06F30/33G06F2119/02
Inventor 章国发王真叶靖
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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