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12.5 Trace Port
The PPC405GP implements a trace status interface to support the tracing of code running in real-
time. This interface enables the connection of an external trace tool, such as RISCWatch, and allows
for user-extended trace functions. A software tool with trace capability, such as RISCWatch with
RISCTrace, can use the data collected from this port to trace code running on the processor. The
result is a trace of the code executed, including code executed out of the instruction cache if it was
enabled. Information on trace capabilities, how trace works, and how to connect the external trace
tool is available in RISCWatch Debugger User's Guide.
A 20-pin male 2x10 header connector is recommended for connecting to the trace status port of the
PPC405GP. The connector, shown in Figure 12-3, and the signal descriptions in Table 12-3 match
the requirements of RISCTrace, when used with the RISCWatch processor probe with RISCTrace
option.
.
1
[8J [8J
2
Index~
[8J [8J
[8J [8J
KeYNotch~ [8J [8J
[8J
[8J
[8J
[8J
[8J [8J
[8J [8J
[8J [8J
19
[8J
[8J
20
Figure 12-3. RISCTrace Header (Top View)
Table 12-3 describes the assignment of the RISCTrace signals and the processor core outputs to the
header pins:
Table 12-3. RISCTrace Header Pin Description
Pin
Signal Name
Pin
Signal Name
1
No connect
11
No connect
2
No connect
12
TS10 (odd)
3
TrcClk
13
TS20
4
No connect
14
TS1e (even)
5
No connect
15
TS2e
6
No connect
16
TS3
7
No connect
17
TS4
8
No connect
18
TS5
9
No connect
19
TS6
Preliminary
Debugging
12-5
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