\item[C] Unpack as CTS data
\item[5] The only SubSubEvent-ID starting with 5 is 5555 at the end of each SubEvent, marking the beginning of the status information word for this SubEvent.
\end{description*}
+The data format is shown in later sections.
+
+
+\subsection{Trigger \& Clock Input}
+Both trigger and clock input (RJ-45 connectors) are equipped with a configurable fan-out chip. Its control signals can be set in slow-control register 0xd300 (currently in CTS only, but should also be present in other central FPGA).
+\begin{description*}
+ \item[Bit 0] Trigger select (local signal: 1, external signal: 0
+ \item[Bit 8] Clock select (Input 0 or 1)
+ \item[Bit 19 -- 16] 4 User signals on trigger fan-out
+ \item[Bit 27 -- 24] 4 User signals on clock fan-out
+\end{description*}
+
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