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Embedded Trace Macrocell
14.3.3
FIFO functionality
14-10
You can also individually configure the four DWT comparators to compare with the
execute PC to permit the ETM access to a PC compare resource. These inputs are
presented to the ETM as Embedded ICE comparator inputs.
Note
Using a DWT comparator as a PC comparator reduces the number of available data
address comparisons.
See DWT on page 11-13 for more information about the DWT unit.
External inputs
Two external inputs, ETMEXTIN[1:0], enable additional on-chip IP to generate
trigger/enable signals for the ETM.
Start/stop block
The start/stop block controls start/stop behavior by using the embedded ICE inputs to
the ETM. The DWT controls these inputs.
The FIFO size is 24 bytes.
A FIFOFULL output is provided to enable the core to be stalled when the FIFO reaches
a specific depth. Although stalling the core in a typical application is unlikely to be
acceptable, it provides a mechanism for enabling 100% trace that could be compared
with the partial trace obtained for a non-stalled run.
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