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Non-BS cluster testing by PRPG / SA

Non-BS cluster testing by PRPG / SA. J. M. Martins Ferreira FEUP / DEEC - Rua Dr. Roberto Frias 4200-537 Porto - PORTUGAL Tel. 351 225 081 748 / Fax: 351 225 081 443 (jmf@fe.up.pt / http://www.fe.up.pt/~jmf). Objectives.

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Non-BS cluster testing by PRPG / SA

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  1. Non-BS cluster testing by PRPG / SA J. M. Martins Ferreira FEUP / DEEC - Rua Dr. Roberto Frias 4200-537 Porto - PORTUGAL Tel. 351 225 081 748 / Fax: 351 225 081 443 (jmf@fe.up.pt / http://www.fe.up.pt/~jmf)

  2. Objectives • To introduce the concepts of pseudo-random pattern generation (PRPG) and signature analysis (SA) • To perform an exhaustive test of a cluster of non-BS components using a PRPG / SA approach

  3. Outline • The cluster to be tested • Information required • Alternative routes to the solution • Test program generation • Experiment

  4. The demonstration board

  5. The IC1+IC2 non-BS cluster To be used in SA mode To be used in PRPG mode

  6. What do we have to know? • How many test vectors are required to guarantee that all 16 combinations are applied to the cluster inputs? (assuming that the BST octal on the left works in 16-bit PRPG mode) • What is the correct signature at the end? (assuming that the BST octal on the right works in 16-bit SA mode)

  7. Pseudo-random pattern generation • How to determine the required number of TCK cycles? • Using a general logic simulation tool: develop a simulation model for the PRPG structure • Using Scan Educator: set up the required PRPG mode and apply TCK cycles until all 16 combinations are identified • In practice: carry out a real test run and analyse the PRPG outputs involved

  8. Signature analysis • How to determine the correct signature at the end? • Using a general logic simulation tool: develop simulation models for the three blocks (PRPG, non-BS cluster, SA) • In practice: carry out a real test run using a fault-free circuit and read the resulting signature

  9. The number of TCK cycles required for PRPG • Select “scan control mode testing – single device – on your own” • Set up the required PRPG mode • Apply TCK cycles until all sixteen combinations are identified

  10. Determining the correct signature • Using the Bitstream Shifter application, set up the required operating mode for the two octals (16-bit PRPG / SA) • Bring the octals to Run Test / Idle and apply the required number of TCK cyles • Read the correct signature in the RX field

  11. Test procedure • BOUNDARY READ opcode  IR • Shift in the initial seed values  DR (BS) • TEST DATA REGISTER SCAN opcode  IR • Set up the required operating mode (TDR: 01 for 16-bit PRPG and 10 for 16-bit SA) • BOUNDARY RUN opcode  IR • Apply the required number of TCK cycles in Run Test / Idle and check the signature

  12. Conclusion • Difference between PRPG / SA and deterministic test vector generation procedures • Difference between the required number of TCK cycles (test speed) • Exhaustive testing via PRPG / SA • Shifting in / out each test vector and response individually

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