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User Manual PXA125
Figure 3-37. The Sequence Table
There are four major elements that you should consider while
programming a sequence table. They are: Link#, Loop(s), Segment#
and Adv. These elements are explained below.
Link # – defines an index array for the sequence table. When
generating sequences, the instrument steps though the link # in
descending order therefore, make sure that you enter your waveform
segments in exactly the order you would like them at the output.
Loop(s) – define how many times the segment will loop for the
selected link. For example, if you program 2, the waveform will cycle
twice through the same segment before transitioning to the next link.
Segment # – associates waveform segments with links. You can use
different segments for different links or you can use the same
segment for a number of links. There are no limitations how you
associate links to segments, except you cannot program in the
sequence table segments that were not defined earlier.
Adv – is a special code that is used in conjunction with the mixed
advance mode. This bit flags the PXA125 if the selected link is
continuous or stepped. Information on the Mixed sequence advance
mode is given later. "0" flags continuous, "1" flags stepped.
Figure 3-7 shows an example of a 4-step sequence of which the first
waveform is made of segment 1, which will loop 20 times; segment 2,
3-62 ArbConnection
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