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Instruction tracing in data processing systems

  • US 20040024995A1
  • Filed: 01/28/2003
  • Published: 02/05/2004
  • Est. Priority Date: 06/07/2002
  • Status: Active Grant
First Claim
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1. Apparatus for processing data, said apparatus comprising:

  • (i) a data processing circuit operable over a sequence of processing cycles to perform data processing operations in response to program instructions; and

    (ii) a tracing circuit operable to generate instruction trace data indicative of operation of said data processing circuit in response to said program instructions;

    (iii) wherein said instruction trace data includes at least one instruction trace word of a predetermined length encoding a sequence of trace events resulting from processing performed on consecutive processing cycles by said data processing circuit, said sequence of trace events including;

    (iv) at least one trace event corresponding to execution of a program instruction by said data processing circuit; and

    (v) at least one trace event corresponding to other than execution of a program instruction by said data processing circuit.

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