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The Embedded Compression Dump

OCI Investigations. The Embedded Compression Dump. Requirement-Definition. What is Compression Dump? During a diagnostic mode – the storage of “bypass patterns” for use “at some later time” is not palatable for many customers The reliance on a vendor’s particular solution is not palatable

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The Embedded Compression Dump

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  1. OCI Investigations The Embedded Compression Dump

  2. Requirement-Definition • What is Compression Dump? • During a diagnostic mode – the storage of “bypass patterns” for use “at some later time” is not palatable for many customers • The reliance on a vendor’s particular solution is not palatable • The use of “simulation” in a Fab or FA environment to determine the logic related to a reported fail is not always possible • There are many tools/vendor-solutions available if the Patter/Chain/Bit of scan chains is available Crouch

  3. TDI DeCompressor Compacto r SDO[0:n] SDO[0:n] Expect TDO The JTAG Shadow Architecture In Diagnostic mode, when a Fail occurs the JTAG Shadow Register Captures the State of the last set of flops that feed the Compactor – this allows Pattern/Chain/Bit to be rebuilt since Pattern & Bit are known; if the compactor has pipelining then the pattern must be re-applied and captured at the cycle when the fail enters the compactor Crouch

  4. Logic Last ScanFlop thatfeedsCompactor SDIfromprevScanCell To Compactor TDIfromprevJTAGCell Scan Clk Shift-DR TDOto nextJTAGCell Capture-DR Fail_Enable JTAG TCK or Scan Clk IJTAG Capture Cell Crouch

  5. DeCompressor Compacto r SDO[0:n] SDO[0:n] Expect The Real-Time Bypass Architecture In Diagnostic mode, when a Fail occurs the Compression Architecture converts to the bypass architecture – the ATE must go into data capture mode. To allow full-data collection, it is best to run the architecture up to before the Sample and to dump the “apply” vector; then run it again and dump the “response” vector; the “golden” state is from dumping a good/golden part Crouch

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