The transition density restriction is related to 128 DAC samples independently from the
instrument modes. According to the section Theory of Operation, the waveform
granularity varies with the Sample Clock Divider. Therefore, the transition density
restriction varies, too.
The transformation of marked samples into rising and falling edges is individually done
for each data segment and the download routine that is responsible for the marker
conversion is not able to detect transitions at the beginning or at the end of data
segments. This would lead to an unexpected behavior at the boundary of segments in
cases where e.g. one segment ends with markers set and a following segment starts
with non-marked samples. Therefore, depending on the marker bit of the first sample,
the software always places a falling or a rising edge at the beginning of each waveform.
This needs to be taken into account by the user, because due to the limitations
mentioned in the previous chapter, the corresponding edge can’t be placed again within
the first 128 samples of a segment. The same problem exists for (big) segments which
are divided up into smaller portions that are separately downloaded. In such case each
portion is treated individually and rising or falling edges are automatically inserted at
the beginning with the already mentioned limitations.
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