Specifications

Statement & condition coverage

Function coverage

Detailed coverage

addresses. The trace source must also be conﬁgured,

so that information is generated deﬁning the virtual

address space in which an instruction was located.

For the ARM ETM/PTM, the amount of trace data can

be further reduced:

• The code-coverage analysis does not analyze or

need time information. We therefore recommend

conﬁguring the TRACE32 trace tool so that the trace

data is transferred to the host without time stamps.

This reduces the amount of data by a third.

• PowerTraceIIalsoprovidesFPGA-basedhardware

compression of the trace data. This enables up to

3.2 GBit/s trace data to be transferred to the host

computer. Figure9 showsthat thistransferrateis

generally sufﬁcient for streaming ETM/PTM data

without any data loss.

Nexus: Optimal Conﬁguration

On processorsof the MPC5xxx/SPC5xx families the

core trace logic is implemented to the Nexus standard.

To undertake code-coverage analysis, a Nexus class 2

trace cell is adequate as all you need is detail of the

program sequence on the individual core(s). If Branch

History Messaging is used this can make the trace

data very compact. Compared to standard trace data

a reduction by a factor of 10 is realistic. Only Power-

Trace II supports streaming from the Nexus trace port.

Streaming also works for all other processors/SoCs

that are supported by TRACE32 and have a trace

port.

Code-Coverage for SMP-Systems

TRACE32 also supports code-coverage analysis on

SMP (symmetric multiprocessing) systems. For code-

coverage it must be proven that an instruction was

executed, which core was responsible for running the

code is irrelevant. Figure 10 shows the results of code-

coveragefortwoCortex-A9MPCores.

For statement and condition coverage, if only the fail-

branch of a conditional statement was run the state-

ment is highlighted in yellow and marked with “not

exec”. The detailed coverage lists the speciﬁcs of how

often each statement or each branch of the statement

was run.

Fig. 10: Code-coverage analysis for an SMP system.