TECHNOLOGIES FOR FAULTS DIAGNOSIS OF FPGA LOGIC BLOCKS
Journal: ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT (Vol.8, No. 1)Publication Date: 2012-08-01
Authors : C U Ngene; V I Hahanov;
Page : 37-45
Keywords : Diagnosis of faults; FPGA; Boundary scan; Fault table; Sum of Products; Product of Sums;
Abstract
The critical issues of testing field programmable gate arrays (FPGA) with a view to diagnosing faults are an important step that ensures the reliability of FPGA designs. Correct diagnosis of faulty logic blocks of FPGAs guarantees restoration of functionality through replacement of faulty block with replacement units. This process can be done autonomously or without the intervention of an engineer depending on application area. This paper considers two methods for analysing test results of FPGA logic blocks with the purpose of localising and distinguishing faults. The algebraic logic and vector-logical methods are proposed for diagnosing faulty logic blocks in FPGA fabric. It is found that the algebraic logic method is more useful for processing of sparse faults tables when the number of coordinates with 1s values with respect to zero values is not more than 20%, whereas the vector-logical method facilitates the analysis of faults table with predominance of 1s values.
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