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8.1. About trace port signal quality

Guaranteed operation of the TPA or logic analyzer depends on correct design of the ASIC and of the target PCB.

When integrating an ETM into an ASIC, the quality and timing of the trace port signals to the TPA are critical for reliable operation. Some of the issues to consider are:

  • output pad selection

  • PCB track lengths

  • PCB track termination

  • setup and hold times for the trace data signals with respect to TRACECLK.

The importance of these issues is directly proportional to the operating frequency. At frequencies greater than 100MHz, careful SPICE analysis of the system including the characteristics of the package and the chosen TPA is recommended.

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