User manual

 iSYSTEM, September 2014 8/23
3.3 Reset Options
Latch target RESET
When the option is checked, the debugger latches active target reset until it gets processed. This
yields a delay between the target reset and restart of the application from reset. If this delay is not
acceptable for a specific application, the option should be unchecked. An example is an application
where the CPU is periodically set into a power save mode and then waken up e.g. every 6ms by an
external reset circuit. In such case, a delay introduced by the debugger would yield application not
operating properly.
When the option is unchecked, the application is resumed after the internal (e.g. watchdog) or external
target reset with a minimum delay.
3.4 Nexus Options
The Nexus Options dialog allows setting the Nexus MDO width and the Nexus clock divider. There is
no uniform rule which setting is the best as it depends on the requirements.
16-bit port size is the default recommended value. It gives the best result in terms of session time and
time accuracy. Profiler uses this configuration internally.
When tracing a lot of data, it is recommended to use 48-port size since 16-bit port size selection will
yield overflows sooner. Note that the maximum port size for the Dx4 device is 24 bits.
Use 4-bit port size when maximum session time (tracing no or minimum data -> profiler) is
required and a time stamp accuracy can be sacrificed.
The Nexus clock divider is usually set to the 1:2 ratio. Lower divider settings can also be used if trace
data integrity problems are suspected.