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CHAPTER 2 DEPENDENCE FUNCTIONS
2.2.8.8 Reading Trace Data On-the-fly
Trace data can be read while executing a program. However, this is not possible during
sampling. Disable the trace function or terminate tracing before attempting to read trace
data.
■ Reading Trace Data On-the-fly in Single Trace
To disable the trace function, use the DISABLE TRACE command. Check whether or not the trace function
is currently enabled by executing the SHOW TRACE command with /STATUS specified, or by using the
built-in variable, %TRCSTAT.
Tracing terminates when the delay count ends after the sequencer has terminated. If Not Break is specified
here, tracing terminates without a break operation. It is possible to check whether or not tracing has
terminated by executing the SHOW TRACE command with /STATUS specified, or by using the built-in
variable, %TRCSAMP.
To read trace data, use the SHOW TRACE command; to search trace data, use the SEARCH TRACE
command. Use the SET DELAY command to set the delay count and break operation after the delay count.
[Example]
>GO
>>SHOW TRACE/STATUS
en/dis = enable
buffer full = nobreak
sampling = on <- Trace sampling continues.
>>SHOW TRACE/STATUS
en/dis = enable
buffer ful = nobreak
sampling = end <- Trace sampling ends.
frame no. = -00805 to 00000
step no. = -00262 to 00000
>>SHOW TRACE -52
step no. address mnemonic level
\sub5:
-00052 : FF0125 LINK #02 1
-00051 : 000186 internal read access. 10E6 1
-00050 : 1010D6 external write access. 10E6 1
-00049 : 000186 internal write access. 10D6 1
.. .
If the CLEAR TRACE command is executed with the trace ending state, trace data sampling can be re-
executed by re-executing the sequencer from the beginning.