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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
Advanced Topics 8-29
manner with respect to the Master Sequencer. To Halt in a pattern
period, the “halt” signal must be provided ~10 Master Clocks and
40-60ns before the end of the desired pattern period (to be
refined).
•
Resume options:
o
CPU Resume
o
CPU Single-Step
o
Probe button
o
Trailing edge of an External Halt (used for System Clutch...see
example below).
•
Halt Edge Test Clear options (static selection):
o
The Halt Edge test flip-flop is cleared just before the beginning of
the Sequence (option #1)
o
The Halt Edge test flip-flop is cleared just before the beginning of
the Sequence or just before the beginning of each subsequent
Sequence Step (option #2)
o
The Halt Edge test flip-flop is cleared just before the beginning of
the Sequence or with a CPU Resume or Single Step (option #3).
Halt Examples:
•
Halt on a Pattern Error:
o
Set the Single Step Type to Halt on Pattern Error
•
Halt on Pattern 6 in Sequence Step 4 (like a breakpoint):
o
Set the Single Step Type to Halt on Sync1
o
Setup Sync Pulse 1 to begin a Sync Pulse on Pattern 6 in Sequence
Step 4 with a duration of 1 pattern.
•
Halt at the end of the Sequence
o
Set the Single Step Type to Halt on the last pattern of the Sequence
o
Start the Sequence
•
Halt on an external Rising Edge signal occurring on the Aux. 2 Input:
o
Set the Halt Source to Aux. 2
o
Set for a Rising Edge Test Condition
o
Set Event Reset to Event
•
Replicate a “System Clutch” function using the Aux. 8 input (an active
high clutch):
o
Set the Halt Source to Aux. 8
o
Set a High Test Condition
Note: A “high” on Aux. 8 causes a halt at the end of the Pattern and a “low”