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13.1.3
TPIU inputs and outputs
Name
TRACECLKIN
TRESETn
ARM DDI 0337B
Formatter
The formatter inserts source ID signals into the data packet stream so that trace data can
be re-associated with its trace source. The formatter is only present in the version of the
TPIU for use with the ETM.
Trace out
The trace out block serializes formatted data before it goes off-chip.
ATB interface
The TPIU accepts trace data from a trace source, either direct from a trace source (ETM
or ITM) or using a Trace Funnel. For more information, see ATB interface.
APB interface
The APB interface is the programming interface for the TPIU. For more information,
see APB interface.
This section describes the TPIU inputs and outputs. It contains the following:
•
Trace out port
•
ATB interface
•
Miscellaneous configuration inputs on page 13-6.
Trace out port
Table 13-1 describes the Trace Out Port signals.
Type
Description
Input
Decoupled clock from ATB to enable easy control of the trace port speed. Typically this
is derived from a controllable clock source on chip but could be driven by an external
clock generator if a high speed pin is used. Data changes on the rising edge only.
Input
This is a reset signal for the TRACECLKIN domain. This signal is typically driven
from Power on Reset, and should be synchronized to TRACECLKIN.
Copyright © 2005, 2006 ARM Limited. All rights reserved.
Trace Port Interface Unit
Table 13-1 Trace Out Port signals
13-5
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