Tektronix 071-0590-00 user manual Auto Search with Non-PRBS Patterns

Reference

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.

GB1400 User Manual 3-21