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User name brads
Log entry time 01:51:22 on November10,2008
Entry number 247884
keyword=BB ADC gates walking by 40ns+The light blue signal is the gate for the ROC5 v792 ADCs. The scope trigger is T6 (on the Ext. trigger input). My recollection is that the ADC gate is timed directly off the L1A for BigBite.
The 40ns walk in the gate vs. T6 suggests that the other T6 correlated triggers (mainly T1, but also T5) come 40ns earlier at the TS. AFAIK, all of the BB ADC gates come from the same source, so they are all walking by up to 40ns depending upon which trigger generates the L1A. Is there really enough clearance between the signals and gate on the 1881s to accommodate this?
FIGURE 1
