@@ -6,16 +6,15 @@ The shutter cycle can either be started by an external signal or synchronized by
...
@@ -6,16 +6,15 @@ The shutter cycle can either be started by an external signal or synchronized by
The external signal, if used, must be connected to one of the six LEMO trigger inputs.\\
The external signal, if used, must be connected to one of the six LEMO trigger inputs.\\
\begin{alertinfo}{If the external signal is used, an appropriate threshold should be set to the corresponding input. The input used for synchronizing the shutter should not be used in the trigger mask.}
\begin{alertinfo}{If the external signal is used, an appropriate threshold should be set to the corresponding input. The input used for synchronizing the shutter should not be used in the trigger mask.}
\end{alertinfo}
\end{alertinfo}
When using EUDAQ, the easiest way to avoid potential conflict between the shutter signal and the trigger input is to connect the shutter input to LEMO 6 and then setting \verb|trigMaskHi= 0x0|. This means that the corresponding input is never involved in a valid active word. See section~\ref{ch:triggerLogic} for details.\\
Figure~\ref{fig:shutter_timing} illustrates the timing of the shutter sequence.\\
\noindent Figure~\ref{fig:shutter_timing} illustrates the timing of the shutter sequence.\\
When the shutter is open, the \gls{tlu} will assert the \verb|CONT| line (see table~\ref{tab:HDMIpins}), indicating to the \gls{dut} that the sequence is active.\\
When the shutter is open, the \gls{tlu} will assert the \verb|CONT| line (see table~\ref{tab:HDMIpins}), indicating to the \gls{dut} that the sequence is active.\\
Behaviour of the shutter is controlled by the IPBus registers described in table~\ref{tab:shutter_registers}. If using EUDAQ, the registers can be written by including the corresponding steering parameters.
Behaviour of the shutter is controlled by the IPBus registers described in table~\ref{tab:shutter_registers}. If using EUDAQ, the registers can be written by including the corresponding steering parameters.
In this case, the easiest way to avoid potential conflict between the shutter signal and the trigger input is to connect the shutter input to LEMO 6 and then setting \verb|trigMaskHi= 0x0|. This means that the corresponding input is never involved in a valid active word. See section~\ref{ch:triggerLogic} for details.\\
The parameters should be included in the config file described in section~\ref{ch:configFile}.
The parameters should be included in the config file described in section~\ref{ch:configFile}.
\caption{Shutter Timing: the E$_{min}$ signal is fed to one of the trigger inputs and initiates the shutter sequence: after a programmable delay t$_{1}$ the \gls{tlu} asserts the \emph{shutter} signal. The unit will start to issue trigger signals to the \gls{dut} once a programmable time t$_{2}$ has elapsed. The window between t$_{1}$ and t$_{2}$ can be used to ensure the \gls{dut} is configured and ready to accept triggers. The unit will issue triggers until the end of the shutter window, determined by t$_{3}$.}
\caption{Shutter Timing: the E$_{min}$ signal is fed to one of the trigger inputs and initiates the shutter sequence; after a programmable delay t$_{1}$ the \gls{tlu} asserts the \emph{shutter} signal. The unit will start to issue trigger signals to the \gls{dut} once a programmable time t$_{2}$ has elapsed. The window between t$_{1}$ and t$_{2}$ can be used to ensure the \gls{dut} is configured and ready to accept triggers. The unit will issue triggers until the end of the shutter window, determined by t$_{3}$.}
