\ref{tab:tdcControlRegBasicLA}).\\
& & 4 & Enables the \textit{Debug Mode}. Different statistics and debug
words are sent after every trigger (see \ref{sec:tdcDebug}).\\
- & & 7-5 & reserved.\\
+ & & 5 & Enables the \textit{Light Mode}. No header and reference channel
+information is sent if there are no recorded hits. Works only in the free
+streaming mode (trigger window off)\\
+ & & 7-6 & reserved.\\
& & 8 & Resets the internal counters (active high).\\
& & 11-9 & reserved.\\
& & 12 & Used to select the trigger mode. \textbf{0:} with trigger mode;
-\textbf{1:} trigger-less mode (For more details see \ref{sec:tdcTrigWin}).\\
+\textbf{1:} trigger-less mode (For more details see \ref{sec:tdcTrigWin}).
+This feature is disabled after tdc\_v2.0.\\
& & 13 & Used to reset the coarse counters. Setting this bit signals for
the coarse counter reset but the action will take place with the arrival of the
next valid trigger in order to synchronise the coarse counters in a large
system.\\
& & 27-14 & reserved.\\
& & 31-28 & Used to divide the calibration hit frequency.\\
- & & & $Freq_{hit}=2.5~MHz/2^n$\\
+ & & & $Freq_{hit}=2.5~MHz/2^n$ (Oscillator frequency is increased to
+20~MHz after tdc\_v2.0.1\\
\hline
\multirow{10}{*}{0xc801} & \multirow{10}{*}{Trigger window}