D.1.1. Avoid stubs

Stubs are short pieces of track that tee off from the main track carrying the signal to, for example, a test point or a connection to an intermediate device. Stubs cause impedance discontinuities that affect signal quality and must be avoided.

Special care must therefore be taken when ETM signals are multiplexed with other pin functions and where the PCB is designed to support both functions with differing tracking requirements.

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