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System Performance Analysis (SPA) Software
System Performance Analysis Software
Using Time Interval mode
Use Time Interval mode to determine the distribution of time between
two specific events. The state analyzer uses the time tag feature to
time the event; thus, in Time Interval mode, the minimum state clock
period is 10 ns.
Specifying an event
To use Time Interval mode, you must define an event that you want
timed. At the bottom of the display, note the Start and End fields. To
define an event, select the appropriate labels in the Start and End
fields to define the boundaries.
For example, start and end might be the beginning and ending
addresses of a subroutine stored in memory. If you are timing a counter
period, start and end might be the initial and final count values.
Note that in start and end, you are not limited to a single label. You
define the event over all available labels as patterns including don’t
cares. Be sure that the start and end conditions actually occur in the
target system or the analyzer will not find the timing reference points
and will not make the time interval measurement. You may want to use
the state analyzer (not SPA) to verify that the Start and Stop events
actually occur.