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Acquiring Waveforms
3-32
CSA8000B & TDS8000B User Manual
for the frame, or until acquisition stops due to a specific test condition,
such as the failure of a mask test.
The resulting horizontally skewed FrameScan acquisitions display successive
individual bits acquired in increasing time order. FrameScan acquisitions can
continue through an entire frame of data if needed to help you to uncover faulty
bit sequences leading up to pattern-dependent failures.
Subframe1 Subframe2 Subframe 3 Subframe4 Subframe5
++ + + =
Accumulated
acquisitions
Subframe1
Subframe2
Subframe3
Subframe4
Subframe5
Notes:
∆h is the horizontal position change = onebit period(= 1/bit-rate)
Subframeacquisition durationis 40% greater thanthe bitperiod
∆h
∆h ∆h ∆h
Figure 3- 10: How FrameScan acquisition works (scanning on a 127-bit PRBS
shown)