User`s manual

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5.9 Performance Analysis Function
5.9.1 Errors
An error will be included in the measured performance as follows:
• ±one-resolution error (±20-ns error when the measurement resolution is 20 ns)
This error may occur when the user program execution starts or stops (breaks) or when the measurement start
or end condition is satisfied.
• Frequency stability of the crystal oscillating module for performance analysis: ±0.01%
5.9.2 Notes
• In all measurement modes, the interval between the end condition satisfaction and the next start condition
satisfaction must be longer than one-measurement-resolution time. If the interval is shorter than that, the
interval itself is included in the measured time.
• In [Time Of Specified Range Measurement], measurement stops when an instruction is fetched outside the
specified range. In [Start Point To End Point Measurement] and [Start Range To End Range Measurement],
measurement stops when the specified end condition is satisfied. When the same addresses are specified for
these modes, the time measured in [Time Of Specified Range Measurement] is longer than that measured in
[Start Point To End Point Measurement] or [Start Range To End Range Measurement].
• Execution time is measured by using address bus values in prefetch cycles. If the end address condition is
specified at an address near the instruction following a branch instruction or delayed slot instruction, correct
time cannot be measured. Check the bus trace display for the operation after the branch instruction prefetch
cycle, and specify the end address condition at the address in a prefetch cycle which will not be executed by
the branching.
• Channel 1 is not available for performance analysis when the Point to Point trace mode is selected.
• The resolution for the performance analysis function can be set in [Timer Resolution] of the [Configuration
Properties] dialog box. If the clock counter value is set as the resolution, the value shown in [RUN-TIME]
and [MAX-MIN-TIME] will be that of the clock counter (displayed in hexadecimal).
5.10 Profiling Function
• If there is no stack information file (extension is ‘.sni’) that is output from the optimizing linkage editor, only
the functions that have been executed during the profiling data measurement are displayed. For details of the
stack information file, refer to the manual of the optimizing linkage editor.
• The stack size differs from the actual value. It should be used as a reference value during a function call. If
there is no stack information file (extension is ‘.sni’) that is output from the optimizing linkage editor, the
stack size is not displayed.
• While the profiling function is used, software break and on-emulator break, which are event functions, are
not available.
• While the profiling function is used, the parallel access function during user program execution is not
available.
• Since the profiling function internally breaks user program execution, the program is not executed in realtime.
The measured value includes an error.