Tektronix, Inc. DG2040, User Manual

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Reference
3Ć62
DG2040 Data Generator
BK1 6
SUB8 25
BK2 1
SUB8 15
BK3 4
SUB8 5
BK7 2
BK5 3
Subsequence: SUB8
Sequence:
BK1 Repeat 6
BK7 Repeat 2
BK5 Repeat 3
S S S
BK7 Repeat 2
BK5 Repeat 3
BK2 Repeat 1
BK7 Repeat 2
BK5 Repeat 3
S S S
BK7 Repeat 2
BK5 Repeat 3
BK3 Repeat 4
BK7 Repeat 2
BK5 Repeat 3
S S S
BK7 Repeat 2
BK5 Repeat 3
Internal code image in
the sequence memory
25 times
15 times
5 times
Subsequence call
Sequence and subsequence example
Suppose that the block pattern data: BK1,
BK2, BK3, BK5 and BK7 has been created
in the pattern memory.
Compile
Figure 3Ć53: Example of a sequence expanded into sequence memory
In enhanced mode the sequence program can jump to the line number set in the
Event Jump field in response to an event input from the rear panel connector
when the output reaches the end of the block in the block field. This is called the
event jump function.
The event jump function can be applied to any line in the sequence program with
the Make Sequence
!
Set Enhanced Control
!
Event Jump menu item.
In the enhanced mode, after the block data for a sequence program for which the
event jump function has been set and has finished outputting, the DG2040 Data
Generator determines whether to perform an event jump.
The fact that an event request occurred is stored in a flip-flop in the pattern
control circuit when either a low level to high level transition occurs in the event
input or the front panel STEP/EVENT button is pressed.
Then, when the end of the output of the block in a line for which the Event
Jump item is set approaches, the DG2040 Data Generator checks the state of
that flip-flop, activates the event jump operation, and clears the flip-flop. A
rising edge in the signal applied to the event input is seen as an event request,
and causes the next event jump operation to occur. This happens also in the
trigger wait state and during the output of data for a block for which the Event
Jump item was set to off.
About Event Jump