\item [0xA0D9] -- Length of the beam itself. After this time the beam inhibit signal is set till next START BEAM signal - $value*100ns$
\item [0xA0DA] -- use different parts of the START detector for histograms
\begin{description}
- \item [Bit 1 -- 0] when '00' inputs 7 - 0 from the Start detector are used, '01' 11 - 4, '10' 15 - 8
- \item [Bit 3 -- 2] when '00' inputs 23 - 16 from the Start detector are used, '01' 27 - 20, '10' 31 - 24
+ \item [Bit 1 -- 0] when '00' inputs 7 - 0 from the Start detector are used for histogramming, '01' 11 - 4, '10' 15 - 8
+ \item [Bit 3 -- 2] when '00' inputs 23 - 16 (7-0 from perperdicular stripes) from the Start detector are used for histogramming, '01' 27 - 20, '10' 31 - 24
+ \item [Bit 7 -- 6] when '00' inputs 7 - 0 from the Start detector are used for trigger logic, '01' 11 - 4, '10' 15 - 8
\end{description}
\item [0xA0DD -- 0xA0DB] Delay the signals with large values - $value * 5\,ns$
\item [0xA0E2 -- 0xA0DE] Set width of the signals - $5 + value * 4\,ns$
\begin{description}
\item[0] There is a LVL1 busy based on LVL1 information sent back from the endpoints
\end{description}
- \item [0xA100 - 0xA100 + 26*500] The memory reserved for the histograms. 500 is number of samples per each histogram. The histograms are created in the SCM FPGA (1) see fig. \ref{ctsbeam}. First 8 is START (first connector) next 8 is also START but perpendicular stripes (second connector). Next 8 is Veto and for the last two the source is selected by 0xA0C2 register.
+ \item [0xA100 - 0xA100 + 26*500] The memory reserved for the histograms. 500 is number of samples per each histogram. The histograms are created in the SCM FPGA (1) see fig. \ref{ctsbeam}. For the first two the source is selected by 0xA0C2 register next 8 is START next 8 is also START but perpendicular stripes (the source of the start histograms is selected in 0xA0DA register). Next 8 is Veto.
\end{description}