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+ \begin{figure}
+ \begin{center}
+ \includegraphics[width=0.7\textwidth]{figures/trb3scfrontpanel.png}
+ \caption[Trb3sc Front Panel]{Connections and LEDs on the Trb3sc front-panel}
+ \label{fig:trb3scfrontpanel}
+ \end{center}
+ \end{figure}
+
+
+\subsubsection{Powering Schemes}
+\begin{description*}
+ \item[External 5V] Connect a 1.5A power supply with not more than 5.5V to the black 3pin input.
+ \item[Backplane 5V] Connect a fitting power supply to the backplane. See the backplane description for further details. DC/DC converters are bypassed for lower noise. Power-LEDs will be off.
+ \item[External 3.5V/1.4V] Remove jumpers J12, J14 and J16. Connect a 1A power supply with 3.5-4.0V and 2A 1.4-1.7V to the black 4pin input. The 2.7V rail can be powered individually or connected to the 3.5V rail.
+ \item[Backplane 3.5V/1.4V] Remove jumpers J12, J14 and J16. Close fuses F1V2L, F3V3L and F2V5L. Connect a proper power supply to the backplane. DC/DC converters are bypassed for lower noise. Power-LEDs will be off.
+\end{description*}
+
+
+\subsubsection{Clock Inputs}
+The current system clock configuration is shown on two LEDs on the front-panel.
+\begin{itemize*}
+ \item The board has own 240 MHz and 125 MHz oscillators. The internal 240 MHz will be selected if there is no external clock available at power-up.
+ \item A external clock can be fed in via the RJ-45 connector (left, pair 2) or from the backplane. The source is selected with a switch. At power-up the board searches for an external clock on the selected input. If none is found, the internal is used.
+ \item The system clock can be recovered from the SFP1 input signal. This is selected at compile-time.
+\end{itemize*}
+
+\subsubsection{Trigger Input/Output}
+\begin{itemize*}
+ \item The default trigger input is pair 1 on the left RJ-45 on the front-panel
+ \item The front-panel trigger input can be rerouted to the second RJ-45 if separation of trigger and clock is required.
+ \item The trigger can be supplied from the backpanel, selected by the switch (same as clock setting)
+\end{itemize*}
+
+\subsubsection{Other I/O}
+JGPIO is available for any general purpose I/O. All lines are LVCMOS25. By default, SPI and UART are available:
+\begin{center}
+ \begin{tabular}{|l|l|}
+ \hline
+ Pin & Usage \\
+ \hline
+ 1 & UART TX\\
+ 2 & UART RX\\
+ 3 & SPI MOSI\\
+ 4 & SPI MISO\\
+ 5 & SPI CLK\\
+ 6 & SPI CE\\
+ 7 & \\
+ 8 & \\
+ 9 & \\
+ 10 & 3.3V\\
+ 11 & 3.3V\\
+ 12 & GND\\
+ 13 & GND\\
+ \hline
+ \end{tabular}
+\end{center}
+
+\subsubsection{Serial Links}
+By default, SFP1 is used for GbE, SFP2 for TrbNet. SFP2 must be removed if the board is to be used on a backplane as slave module. Removing the SFP selects the backpanel as TrbNet input.
+
+
+ %--Serdes: Backplane
+ %--Backplane A2,A3,A0,A1 Slave 3,4,1,2, A0: TrbNet from backplane
+ %--AddOn C2,C3,C0,C1,B0,B1,B2,D1(B3) Slave --,--,5,9,8,7,6,--
+ %--SFP D0,B3(D1) D0: GbE, B3: TrbNet
+
+By default, the use of Serdes channels is as follows:
+\begin{center}
+ \begin{tabularx}{\textwidth}{|l|l|X|}
+ \hline
+ Block & Channel & Usage \\
+ \hline
+ \multirow{4}{*}{A}
+ & 0 & Backplane, Master: TrbNet to Slave 1, Slaves: TrbNet input from backplane\\
+ & 1 & Backplane, Master: TrbNet to Slave 2\\
+ & 2 & Backplane, Master: TrbNet to Slave 3\\
+ & 3 & Backplane, Master: TrbNet to Slave 4\\
+ \hline
+ \multirow{4}{*}{B}
+ & 0 & AddOn Connector, Master: TrbNet to Slave 8\\
+ & 1 & AddOn Connector, Master: TrbNet to Slave 7\\
+ & 2 & AddOn Connector, Master: TrbNet to Slave 6\\
+ & 3 & SFP2 (TrbNet), can be re-routed to AddOn-Connector\\
+ \hline
+ \multirow{4}{*}{C}
+ & 0 & AddOn Connector, Master: TrbNet to Slave 5\\
+ & 1 & AddOn Connector, Master: TrbNet to Slave 9\\
+ & 2 & AddOn Connector\\
+ & 3 & AddOn Connector\\
+ \hline
+ \multirow{4}{*}{D}
+ & 0 & SFP1 (GbE)\\
+ & 1 & AddOn Connector, can be re-routed to SFP2\\
+ & 2 & not used\\
+ & 3 & not used\\
+ \hline
+ \end{tabularx}
+% \caption[Trb3sc Serdes Mapping]{Mapping of Serdes channels}
+\end{center}
+
+
+\subsubsection{Modifications}
+The following changes compared to the original schematics are to be made:
+\begin{description*}
+ \item [R12, R14] 270 Ohm, LED is too dim
+ \item [R13, R15] 680 Ohm, LED is too dim
+ \item [R16, R17] 680 Ohm, LED is too bright
+ \item [Patchwire] Disconnect R14 from 2.5V (rotate by 90°), patchwire to Pin 2 of switch - green LED shows status of clock select
+\end{description*}
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