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ModelSim SE User's Manual - Electrical and Computer Engineering

ModelSim SE User's Manual - Electrical and Computer Engineering

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UM-308 11 - Tracing signals with the Dataflow window<br />

<strong>ModelSim</strong> <strong>SE</strong> User’s <strong>Manual</strong><br />

These comm<strong>and</strong>s behave as follows:<br />

TraceX / TraceX Delay— Step back to the last driver of an X value. TraceX Delay works<br />

similarly but it steps back in time to the last driver of an X value. TraceX should be used<br />

for RTL designs; TraceX Delay should be used for gate-level netlists with back annotated<br />

delays.<br />

ChaseX / ChaseX Delay — "Jumps" through a design from output to input, following X<br />

values. ChaseX Delay acts the same as ChaseX but also moves backwards in time to the<br />

point where the output value transitions to X. ChaseX should be used for RTL designs;<br />

ChaseX Delay should be used for gate-level netlists with back annotated delays.

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