\item[ShutterStateW] The \gls{lsb} of this register is propagated to the \gls{dut}s as shutter signal. This is the signal that the \gls{dut}s receive on the \verb|cont| line.
\item[PulseT0] Writing to this register will cause the firmware to generate a T0 signal.
\item[SHUTTER] These registers control the signal that the \gls{dut}s receive on the \verb|cont| line. A shutter on/off (active/inactive) signal can either be produced from an internal timer or triggered from one of the trigger inputs (N.B. Any trigger input used to control the shutter will still be connected to the trigger logic. Set the trigger mask accordingly)
\item[ControlRW] The \gls{lsb} of this register controls if shutter pulses are active. 1 = active.
\item[ControlRW] Bit-0 controls if shutter pulses are active. 1 = active
\item[ShutterSelectRW] Selects which input is used to trigger shutter
\item[InternalShutterPeriodRW] Internal trig generator period ( units = number of strobe pulses)
\item[ShutterOnTimeRW] Time between input trigger being received and shutter asserted(T1) ( units = number of strobe pulses)
\item[ShutterVetoOffTimeRW] time between input trigger and veto being de-asserted(T2) ( units = number of strobe pulses)
\item[ShutterOffTimeRW] time between input trigger and time at which shutter de-asserted and veto reasserted(T3) ( units = number of strobe pulses)
\item[RunActiveRW" Writing '1' to Bit-0 of this register raises the internal run\_active signal and and causes sync line to pulse for one clock cycle (i.e. issues a start of run T0 signal
