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Reference
GB1400 User Manual 3-21
AUTO SEARCH with "Non-PRBS" Patterns
In cases where you need to use a WORD or other type pattern for testing, you
can still use AUTO SEARCH to set DATA and CLOCK threshold, and DATA
input delay and threshold as follows:
1. Set up the Generator to transmit a PRBS pattern.
2. Enable Analyzer AUTO SEARCH as follows:
EXT (ref. data input control), off
SYNC DISABLE, off
AUTO SEARCH, on
3. After the Analyzer LOCK LED turns on, disable AUTO SEARCH by
pressing the AUTO SEARCH key. Verify that the LED in the AUTO
SEARCH key turns off.
4. Change the pattern setup of the Generator and Analyzer as desired. For
example, to perform a test using a WORD pattern stored in memory: press
the Analyzer pattern RECALL key and up/down keys to select the WORD
pattern. Repeat these steps on the Generator to select the same WORD
pattern. At this point the SYNC LOCK LED should turn on again indicating
that the Analyzer has regained synchronization. You may now start a new
test interval by clearing previous results (PRESS ERROR DETECTION
CLEAR key) and history indicators (PRESS HISTORY CLEAR key).
How to DISABLE Automatic Pattern Resynchronization
The pattern resynchronization disable feature is turned on or off as follows:
Press the DISABLE key to toggle automatic pattern resynchronization on or off.
When the DISABLE LED is on, pattern resynchronization is disabled. When the
DISABLE LED is off, pattern resynchronization is enabled.
Relationship between AUTO SEARCH and DISABLE
Turning AUTO SEARCH on automatically turns DISABLE off. Similarly,
turning DISABLE on automatically turns AUTO SEARCH off. That is, AUTO
SEARCH and DISABLE cannot be on at the same time. However you may turn
both functions off. There are, therefore, three possible levels of Analyzer
synchronization:
1. AUTO SEARCH on: This is the most automated mode.
2. AUTO SEARCH off and DISABLE off: This is a partially automated mode
with AUTO SEARCH functions disabled but auto-pattern resynchronization
still enabled.
3. DISABLE on: This is the "fully manual" mode in which all AUTO SEARCH
functions and the auto-pattern resynchronization function, are disabled.