Tektronix, Inc. DG2040, User Manual

Page: 46 / 266

Operating Basics
2Ć12
DG2040 Data Generator
The sequence data is a program that specifies the order in which the pattern data
is output. The sequence data is used to set up operations, such as repeatedly
putting out blocks of pattern data for a specified number of times and jumping to
a specified block when an external event occurs. Sequences allow long patterns
to be set up without preparing large quantities of data.
Sequences can include subsequences so that you can make complex sequence
programming easier. Sequence data is transferred to the pattern generation unit
sequence memory, and controls the operation of the pattern control circuit.
When you use the run mode you can select whether all the sequence data is valid
or whether enhanced mode settings, such as event jumps in the sequence, are
ignored.
Operating Modes Overview
In the run modes, pattern output is controlled by the pattern generation units
pattern control circuit. The DG2040 Data Generator supports four run modes:
repeat, single, step, and enhanced. These run modes are specified with the
SETUP
→
Run Mode menu. Table 2-3 provides functional information for each
mode.
Table 2Ć3: Run modes
Run mode Function
Repeat Repeats the pattern data from the first to last data point indefinitely.
If a sequence is defined, it repeats the output according to that
sequence.
Single Outputs the pattern data once from the first to last data point in point
order. If a sequence is defined, outputs the pattern once according to
that sequence.
Step Operates identically to repeat mode, except that just one data point
is output each time the STEP/EVENT button is pressed.
Enhanced Same as Repeat with the addition that event jumps and trigger waits
are also effective.
NOTE
. The Repeat, Single, and Step modes ignore the event jump and trigger
wait settings.
Sequence Data
Run Modes