\subsection{Converter board registers}
\label{app:conv-regs}

Base address: 0x000
{
\rowcolors{2}{white}{gray!25}
\begin{longtable}{l l l p{.5\textwidth}}
\hline
\textbf{Offset} & \textbf{Reset} & \textbf{Name} 
		& \textbf{Description} \\
\hline
\endfirsthead
\hline
\hline
\endhead
\hline
\endfoot
0x0 & 0x54424c4f & BIDR & Board ID Register\\
0x4 & (1)        & SR & Status Register\\
0x8 & 0x00000000 & CR & Control Register\\
0xc & 0x00000000 & CH1PCR & Channel 1 Pulse Counter Register\\
0x10 & 0x00000000 & CH2PCR & Channel 2 Pulse Counter Register\\
0x14 & 0x00000000 & CH3PCR & Channel 3 Pulse Counter Register\\
0x18 & 0x00000000 & CH4PCR & Channel 4 Pulse Counter Register\\
0x1c & 0x00000000 & CH5PCR & Channel 5 Pulse Counter Register\\
0x20 & 0x00000000 & CH6PCR & Channel 6 Pulse Counter Register\\
0x24 & 0x00000000 & TVLR & Time Value Low Register\\
0x28 & 0x00000000 & TVHR & Time Value High Register\\
0x2c & 0x00000000 & TBMR & Tag Buffer Meta Register\\
0x30 & 0x00000000 & TBCYR & Tag Buffer Cycles Register\\
0x34 & 0x00000000 & TBTLR & Tag Buffer TAI Low Register\\
0x38 & 0x00000000 & TBTHR & Tag Buffer TAI High Register\\
0x3c & 0x00020000 & TBCSR & Tag Buffer Control and Status Register\\
\end{longtable}
}

\noindent Note (1): The reset value of the SR cannot be specified, since it is based on the
gateware version, the state of the on-board switches and whether an RTM is plugged in or not.

\vspace{11pt}
\subsubsection{BIDR -- Board ID Register}
\label{app:conv-regs-bidr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}BIDR[31:24]}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}BIDR[23:16]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}BIDR[15:8]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}BIDR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
BIDR
} [\emph{read-only}]: ID register bits
\\
Reset value: 0x54424c4f
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{SR -- Status Register}
\label{app:conv-regs-sr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & \multicolumn{1}{|c|}{\cellcolor{gray!25}PMISSE} & \multicolumn{1}{|c|}{\cellcolor{gray!25}I2C\_ERR}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{1}{|c|}{\cellcolor{gray!25}WRPRES} & \multicolumn{1}{|c|}{\cellcolor{gray!25}I2C\_WDTO} & \multicolumn{6}{|c|}{\cellcolor{gray!25}RTM[5:0]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}SWITCHES[7:0]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}GWVERS[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
GWVERS
} [\emph{read-only}]: Gateware version
\\
Leftmost nibble hex value is major release decimal value \\                     Rightmost nibble hex value is minor release decimal value \\		     e.g. \\		     0x11 -- v1.1 \\		     0x2e -- v2.14
\end{small}
\item \begin{small}
{\bf 
SWITCHES
} [\emph{read-only}]: Status of on-board switches (see Section~\ref{sec:switches})
\\
0 -- switch is ON \\		     1 -- switch is OFF
\end{small}
\item \begin{small}
{\bf 
RTM
} [\emph{read-only}]: RTM detection lines~\cite{rtm-det}
\\
0 -- line active \\                     1 -- line inactive
\end{small}
\item \begin{small}
{\bf 
I2C\_WDTO
} [\emph{read/write}]: Communication watchdog timer status
\\
1 -- timeout occured \\                     0 -- no timeout \\                     This bit can be cleared by writing a '1' to it
\end{small}
\item \begin{small}
{\bf 
WRPRES
} [\emph{read-only}]: White Rabbit present
\\
1 -- White Rabbit present \\                     0 -- White Rabbit not present
\end{small}
\item \begin{small}
{\bf 
I2C\_ERR
} [\emph{read/write}]: I2C communication error
\\
1 -- attempted to address non-existing address \\                     0 -- idle \\                     This bit can be cleared by writing a '1' to it
\end{small}
\item \begin{small}
{\bf 
PMISSE
} [\emph{read/write}]: Pulse missed error
\\
1 -- input pulse rejected to safeguard blocking output stage \\                     0 -- idle \\                     This bit can be cleared by writing a '1' to it
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{CR -- Control Register}
\label{app:conv-regs-cr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & \multicolumn{2}{|c|}{\cellcolor{gray!25}MPT[7:6]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{6}{|c|}{\cellcolor{gray!25}MPT[5:0]} & \multicolumn{1}{|c|}{\cellcolor{gray!25}RST} & \multicolumn{1}{|c|}{\cellcolor{gray!25}RST\_UNLOCK}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
RST\_UNLOCK
} [\emph{read/write}]: Reset unlock bit
\\
1 -- Reset bit unlocked \\                     0 -- Reset bit locked
\end{small}
\item \begin{small}
{\bf 
RST
} [\emph{read/write}]: Reset bit
\\
1 -- initiate logic reset \\                     0 -- no reset
\end{small}
\item \begin{small}
{\bf 
MPT
} [\emph{write-only}]: Manual Pulse Trigger
\\
Write the following sequence to trigger a pulse: \\                     0xde -- Byte 1 of magic sequence \\                     0xad -- Byte 2 of magic sequence \\                     0xbe -- Byte 3 of magic sequence \\                     0xef -- Byte 4 of magic sequence \\		     Number in range 1..6 -- trigger a pulse
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{CH1PCR -- Channel 1 Pulse Counter Register}
\label{app:conv-regs-ch1pcr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH1PCR[31:24]}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH1PCR[23:16]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH1PCR[15:8]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH1PCR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
CH1PCR
} [\emph{read/write}]: Pulse counter value
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{CH2PCR -- Channel 2 Pulse Counter Register}
\label{app:conv-regs-ch2pcr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH2PCR[31:24]}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH2PCR[23:16]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH2PCR[15:8]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH2PCR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
CH2PCR
} [\emph{read/write}]: Pulse counter value
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{CH3PCR -- Channel 3 Pulse Counter Register}
\label{app:conv-regs-ch3pcr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH3PCR[31:24]}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH3PCR[23:16]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH3PCR[15:8]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH3PCR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
CH3PCR
} [\emph{read/write}]: Pulse counter value
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{CH4PCR -- Channel 4 Pulse Counter Register}
\label{app:conv-regs-ch4pcr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH4PCR[31:24]}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH4PCR[23:16]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH4PCR[15:8]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH4PCR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
CH4PCR
} [\emph{read/write}]: Pulse counter value
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{CH5PCR -- Channel 5 Pulse Counter Register}
\label{app:conv-regs-ch5pcr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH5PCR[31:24]}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH5PCR[23:16]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH5PCR[15:8]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH5PCR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
CH5PCR
} [\emph{read/write}]: Pulse counter value
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{CH6PCR -- Channel 6 Pulse Counter Register}
\label{app:conv-regs-ch6pcr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH6PCR[31:24]}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH6PCR[23:16]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH6PCR[15:8]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}CH6PCR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
CH6PCR
} [\emph{read/write}]: Pulse counter value
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{TVLR -- Time Value Low Register}
\label{app:conv-regs-tvlr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TVLR[31:24]}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TVLR[23:16]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TVLR[15:8]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TVLR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
TVLR
} [\emph{read/write}]: TAI seconds counter bits 31..0
\\
Writing this field resets the internal cycles counter.
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{TVHR -- Time Value High Register}
\label{app:conv-regs-tvhr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TVHR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
TVHR
} [\emph{read/write}]: TAI seconds counter bits 39..32
\\
Writing this field resets the internal cycles counter.
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{TBMR -- Tag Buffer Meta Register}
\label{app:conv-regs-tbmr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{1}{|c|}{\cellcolor{gray!25}WRTAG} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{1}{|c}{-} & - & \multicolumn{6}{|c|}{\cellcolor{gray!25}CHAN[5:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
CHAN
} [\emph{read-only}]: Channel mask
\\
Mask for the channel(s) that triggered time-tag storage: \\                     bit 0 -- channel 1 \\		     bit 1 -- channel 2 \\		     ... \\		     bit 5 -- channel 6
\end{small}
\item \begin{small}
{\bf 
WRTAG
} [\emph{read-only}]: White Rabbit present
\\
1 - Current time tag generated with White Rabbit \\                     0 - Current time tag generated with internal counter
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\item \begin{small}
\textbf{A read from this register advances the buffer read pointer, if the ring buffer is not empty}
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{TBCYR -- Tag Buffer Cycles Register}
\label{app:conv-regs-tbcyr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & \multicolumn{4}{|c|}{\cellcolor{gray!25}TBCYR[27:24]}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TBCYR[23:16]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TBCYR[15:8]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TBCYR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
TBCYR
} [\emph{read-only}]: Cycles counter
\\
Value of the 8-ns cycles counter when time tag was taken.
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{TBTLR -- Tag Buffer TAI Low Register}
\label{app:conv-regs-tbtlr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TBTLR[31:24]}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TBTLR[23:16]}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TBTLR[15:8]}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TBTLR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
TBTLR
} [\emph{read-only}]: Lower part of TAI seconds counter
\\
Value of the TAI seconds counter bits 31..0 when time tag was taken.
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{TBTHR -- Tag Buffer TAI High Register}
\label{app:conv-regs-tbthr}

%\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{8}{|c|}{\cellcolor{gray!25}TBTHR[7:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
TBTHR
} [\emph{read-only}]: Upper part of TAI seconds counter
\\
Value of the TAI seconds counter bits 39..32 when time tag was taken.
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}
\vspace{11pt}
\subsubsection{TBCSR -- Tag Buffer Control and Status Register}
\label{app:conv-regs-tbcsr}

\vspace{11pt}
\noindent
\resizebox{\textwidth}{!}{
\begin{tabular}{>{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} >{\centering\arraybackslash}p{1.5cm} }
31 & 30 & 29 & 28 & 27 & 26 & 25 & 24\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
23 & 22 & 21 & 20 & 19 & 18 & 17 & 16\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & \multicolumn{1}{|c|}{\cellcolor{gray!25}CLR} & \multicolumn{1}{|c|}{\cellcolor{gray!25}EMPTY} & \multicolumn{1}{|c|}{\cellcolor{gray!25}FULL}\\
\hline
15 & 14 & 13 & 12 & 11 & 10 & 9 & 8\\
\hline
\multicolumn{1}{|c}{-} & - & - & - & - & - & - & \multicolumn{1}{c|}{-}\\
\hline
7 & 6 & 5 & 4 & 3 & 2 & 1 & 0\\
\hline
\multicolumn{1}{|c}{-} & \multicolumn{7}{|c|}{\cellcolor{gray!25}USEDW[6:0]}\\
\hline
\end{tabular}
}

\begin{itemize}
\item \begin{small}
{\bf 
USEDW
} [\emph{read-only}]: Buffer counter
\\
Number of samples in the ring buffer
\end{small}
\item \begin{small}
{\bf 
FULL
} [\emph{read-only}]: Buffer full
\\
1 -- buffer full \\      0 -- buffer is not full
\end{small}
\item \begin{small}
{\bf 
EMPTY
} [\emph{read-only}]: Buffer empty
\\
1 -- buffer empty\\      0 -- buffer is not empty
\end{small}
\item \begin{small}
{\bf 
CLR
} [\emph{write-only}]: Clear tag buffer
\\
1 -- clear\\      0 -- no effect
\end{small}
\item \begin{small}
\textbf{Unimplemented bits}: write as '0', read undefined
\end{small}
\end{itemize}



