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Reference
GB1400 User Manual 3-19
Analyzer (RX) Functions
This section explains how to enable or disable Analyzer automatic
synchronization functions. It further shows how to manually set Analyzer input
parameters and error detection functions, and how to start tests, view results, and
print results. The section also defines all results calculated by the Analyzer.
Automatic Setup Functions (SYNC )
This section explains how to use the following "SYNC" controls and indicator in
the ERROR DETECTION section:
AUTO SEARCH key.
DISABLE key.
LOCK indicator.
AUTO SEARCH Key
The AUTO SEARCH key is used to enable or disable the auto-search feature.
When auto-search is enabled, the Analyzer will automatically attempt to set the
following parameters each time pattern synchronization is lost:
1. clock and data input threshold,
2. data input delay,
3. PRBS pattern,
4. pattern polarity, and
5. pattern alignment.
In addition, auto-search will clear (turn off) the BIT and PHASE history
indicators once pattern sync. is regained. Thus, AUTO SEARCH can greatly
simplify Analyzer setup and operation, especially when the input clock and data
phase relationship and amplitudes are not known.
DISABLE Key
The DISABLE key is used to disable automatic pattern realignment. When
automatic pattern realignment is enabled (DISABLE off) the Analyzer will
attempt to resynchronize its pattern detector each time BER goes above the
pattern synchronization threshold by looking for a new pattern alignment. A
change of pattern alignment will occur, for example, if a buffer over flows or
under flows in the DUT. A change of pattern alignment will also normally occur
if the CLOCK input to the Analyzer is momentarily disconnected.
On the other hand, with pattern realignment disabled (DISABLE on), the
Analyzer will not attempt to find a new pattern alignment—even if BER goes
above the synchronization threshold—until the start of a new test interval. This
allows the analyzer to measure BER and count errors on signals with very high
error rates.