= FEB proto 3 : Synchronization =

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In the following, the green signal is the reference CROC Global clock signal (CROC quartz), the yellow signal 
is either the clock of the front-end board, the L0 or the read_command. Green is the trigger for the clock study, the yellow signal is the trigger when looking at the L0 and the Read Command. The time scale is 2ns.

== Djitter Clock == 
Incoming clock signal taken at the input of the LVDS/unipolar convertor of the board (polarity minus)

[[Image(clock2.bmp)]]

Clock signal taken at the output of the clock buffer driver.

[[Image(clock3.bmp)]]

Clock signal taken at the output of the Delay chip for ADC 0.

[[Image(clock4.bmp)]]

Clock ADC 0 (polarity +).

[[Image(clock5.bmp)]]

Clock ADC 0 (polarity -).

[[Image(clock6.bmp)]]


== Djitter L0 == 
L0 signal at the output of the LVDS/unipolar convertor of the FEB.

[[Image(L0_1.bmp)]]

L0 signal at the output of the Sequencer : a large (~1ns) djitter  appears.

[[Image(L0_2.bmp)]]



== Djitter Read Command == 

First RdCmd at the output of the Sequencer. The First RdCmd is used as the scope trigger. Large djitter wrt 
to the CROC clock.

[[Image(rd_1.bmp)]]

One of the next RdCmd (8?). We have both a djitter wrt the clock (green) but also wrt the first RdCmd still 
used as the trigger reference. Rd_Cmd have djitters amongs themselves -> no sampling at the output of the sequencer ?

[[Image(rd_2.bmp)]]