Specifications

Timing Trace Pop-up Menu Commands 231
Timing Data Retention
These options allow you to determine how much signal-event data is
retained in memory when a simulation is run.
Each time a signal level change occurs LogicWorks creates a record in
memory containing a reference to the signal, time, new value, and source
of the change. In a large simulation these records can consume enormous
amounts of memory. This data can be retained for the following purposes:
 For use in refreshing the Timing window, should it become hidden
then redisplayed.
 For use in timing window editing operations, such as taking the output
from one circuit and using it as stimulus for another.
Data can be retained only for signals displayed in the Timing window. Sig-
nal-event data for all other signals is discarded immediately after it is no
longer required for simulation.
The option “Retain displayed range only” is the normal default and results
in data being discarded immediately after the corresponding point on the
Timing display scrolls off the left side. This results in minimal memory
usage. The setting is equivalent to entering 0 in the Retain time box.
The option “Retain for x time units” allows you to keep the signal-event
data for the specified amount of time after it scrolls off the left side of the
screen. If this results in a memory shortage occurring, then the simulation
will stop and a message will be displayed.
LW Reference.bk Page 231 Monday, December 15, 2003 5:59 PM