
Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
Soft Front Panel Operation 5-77
2. Idle/Standby Timing
Phase/Window Spanning
Phase/Window spanning allows the user to Assert/Open the timing signal in one
pattern and Return/Close the signal in a different pattern. The following steps
describe how to span timing signals across multiple patterns:
1. Disable the Return signal in the first pattern’s timing set by setting the
Return value equal to the pattern period.
2. Disable the Assert and Return signal in any patterns between the first and
the last pattern being spanned by setting the Assert Value to zero and the
Return value equal to the pattern period.
3. Disable the Assert signal in the last pattern by setting the Assert Value to
zero.
For example, let’s assume we have three patterns and each pattern has a period
of 100. We want the Phase 1 Assert at 50 of the first pattern and Return at 75 of
the third pattern.
Pattern 1, TS1 = Assert 50, Return 100
Pattern 2, TS2 = Assert 0, Return 100
Pattern 3, TS3 = Assert 0, Return 75
Idle/Standby Timing
One of the unique features of the DRM is the Idle/Standby state. After the
execution of a sequence burst, the sequencer will enter the Idle/Standby state.
The user can define the Idle/Standby state timing and pattern such that UUT
stimulus can be maintained between pattern bursts. A single pattern can be
specified so that the pattern memory can be updated (Standby) or a group of
patterns can be specified (Idle) during this state.
The user can disable the timing set phases/windows during the Idle/Standby
state by setting Assert/Return and Open/Close values to zero.
Editing the Patterns
Patterns are the memory element that contains the instructions for each channel
during a sequence burst. These instructions, called pattern codes, define
whether a channel will drive high, drive low, test high, etc.
Once a sequence step has been initialized, a pattern set is assigned to the step.
A
Pattern Set
is one or more patterns. A
Pattern
is the pattern codes for all the
channels that will be applied at the same time. (See
Patterns
in
Chapter 5
.)
Access this panel from the menu bar:
Edit > Data Sequencer x > Patterns
.
(Where “x” is the sequencer you wish to configure.)