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Test data compression and decompression based on internal scan chains and Golomb coding

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2 Author(s)
Chandra, A. ; Dept. of Electr. & Comput. Eng., Duke Univ., Durham, NC, USA ; Chakrabarty, K.

We present a data compression method and decompression architecture for testing embedded cores in a system-on-a-chip (SOC). The proposed approach makes effective use of Golomb coding and the internal scan chain(s) of the core under test and provides significantly better results than a recent compression method that uses Golomb coding and a separate cyclical scan register (CSR). The major advantages of Golomb coding of test data include very high compression, analytically predictable compression results, and a low-cost and scalable on-chip decoder. The use of the internal scan chain for decompression obviates the need for a CSR, thereby reducing hardware overhead considerably. In addition, the novel interleaving decompression architecture allows multiple cores in an SOC to be tested concurrently using a single ATE I/O channel. We demonstrate the effectiveness of the proposed approach by. applying it to the ISCAS 89 benchmark circuits

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:21 ,  Issue: 6 )