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IMPLEMENTATION OF BILBO

Platform : vlsi

IEEE Projects Years : 1990

This paper appears in: Computers and Digital Techniques, IEE Proceedings E Issue Date: Jan 1990 Volume: 137 Issue:1 On page(s): 88 - 102 ISSN: 0143-7062 INSPEC Accession Number: 3582722 Date of Current Version: 02 May 2005 AIM: IMPLEMENTATION OF BILBO TECHNIQUE FOR HIGH TEST COVERAGES ABSTRACT The need for reliable integrated circuits is becoming of paramount importance as they are increasingly used in a range of safety critical applications or domestic products. In the past reliability has been achieved at the IC level by comprehensive testing of the device after manufacture. The use of scan design and BILBO techniques have assisted designers in achieving the necessary high test coverages with little effort. However these methods only address the problem of testing for permanent faults after fabrication or periodically during the lifetime of a system. These 'classical' techniques do not tackle the more serious problem of intermittent faults, which will come to dominate VLSI circuits as device geometries decrease. To deal with intermittent faults and maintain reliable operation concurrent test methods need to be used. The paper presents one possible method of detecting and correcting single intermittent faults that occur during normal operation and also assist the designer in post fabrication testing. The chosen technique uses information redundancy in the form of a SEC/DED Hamming code and is illustrated by the design of a 32-bit CMOS RISC processor. The processor is capable of detecting and correcting errors arising from faults as they occur without the need to halt normal operations or recourse to any specialised software. A detailed appraisal of the costs involved in using this technique is given in terms of the extra silicon area needed and the reduction in throughout of the processor. LEARNING OBJECTIVE: Reduction in throughout of the processor with the help of BILBO technique. INPUT: ASM machine for BILBO technique OUTPUT : Simulated output for the BILBO technique. APPLICATIONS: VLSI Design SOFTWARE TOOL USED: XLINX8.1I

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