Deadtime         *************************************************************
Readout Complete                            ==================================
Validation                                 === 
Validation Window                       =====
Event Rejection       .....................
Fast Trigger        ==
Fast Trig Window  ===
CFD pulse        ==
                 _____________________________________________________________
Ge Card status   | Shaping Phase     | Conversion Phase  | Readout Phase     | 
                 +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
Time (us)        0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
   
Typical Accepted Event (Event rejection permissible in period shown ....)
-------------------------------------------------------------------------
 
 
 
 
 
 
 
 
 
Deadtime (GI)     *********************
Deadtime(gaussian)****************************************************
Readout Complete               
Validation                      
Validation Window              
Event Rejection              ===
Fast Trigger         ==
Fast Trig Window   ===
CFD pulse         ==
                  _____________________
Ge Card status    | Shaping Phase     | 
                  +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
Time (us)         0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
 
Rejected Event (showing difference in deadtime using GI and Semi-Gaussian amp)
------------------------------------------------------------------------------
 
 
 
 
 
 
 
 
Figure 1   Example Timing Diagrams for Eurogam trigger system
-------------------------------------------------------------
 
 
***************** next diagram ******************
 
 
 
 
Fast Trigger      _____________________             _________________
                                       \___________/
 
Fast Trigger      ____________                _______________________
Acceptance Window             \______________/
 
Setup time (min 5ns)                    *****
Hold time  (min 5ns)                          *****
 
 
 
 
 
 
 
 
Validation       _______________                       _____________
                                \_____________________/ 
 
Validation        ________                  ________________________
Acceptance window         \________________/  
 
Setup time (min 10ns)            **********
Hold time (min 10ns)                        **********
 
 
 
 
 
 
 
Validation       _______________                       _____________
                                \_____________________/ 
 
Readout complete ___________________                                 _________
                                    \_______________________________/_/_/_/_/
 
 
 
ALL SIGNALS SHOWN ACTIVE LOW
 
 
 
 
 
 
 
            Figure 2     Detail of Eurogam Trigger timing
            ---------------------------------------------
 
 
***************** next diagram *******************
 
 
 
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
|     |     |     |     |     |     |     |     |     |     |     |     |     |
|Slot0|Read | Ge  | Ge  | Ge  | Ge  | Ge  | Ge  | Ge  | Ge  | Ge  | Ge  | Ge  |
| and |  out|     |     |     |     |     |     |     |     |     |     |     |
| RM  |     |     |     |     |     |     |     |     |     |     |     |     |
|     |     |     |     |     |     |     |     |     |     |     |     |     |
|F ************   |     |     |     |     |     |     |     |     |     |     |
|A *******************  |     |     |     |     |     |     |     |     |     |
|S *************************  |     |     |     |     |     |     |     |     |
|T *******************************  |     |     |     |     |     |     |     |
|  *************************************  |     |     |     |     |     |     |
|T *******************************************  |     |     |     |     |     |
|R *************************************************  |     |     |     |     |
|I *******************************************************  |     |     |     |
|G *************************************************************  |     |     |
|  ******************************************************************   |     |
|  ******************* FAST TRIGGER (STARX) VXI BACKPLANE *****************   |
|     |     |     |     |     |     |     |     |     |     |     |     |     |
|  ******************* VALIDATE (ECLTRIG) VXI BACKPLANE *******************   |
|     |     |     |     |     |     |     |     |     |     |     |     |     |
|  ******************* EVENT REJECT (ECLTRIG) VXI BACKPLANE ***************   |
|     |     |     |     |     |     |     |     |     |     |     |     |     |
| *****     ********** VXI ANALOG SUMBUS (BACKPLANE) ***********************  |
|     |     |     |     |     |     |     |     |     |     |     |     |     |
| ********  |     |     |     |     |     |     |     |     |     |     |     |
|(READOUT COMPLETE)     |     |     |     |     |     |     |     |     |     |
| (VXI LOCAL BUS) |     |     |     |     |     |     |     |     |     |     |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
/\ ||
|| ||
|| ||
|| \/
 
All trigger signals go
in and out of crate via the 
Slot 0 / Resource Manager.          
 
Into crate: Fast Trigger, Validate, Event Reject
Out of crate: VXI analog sumbus (buffered), Readout Complete.
 
 
 
 
 
 
 
                    Figure 3  Trigger System in a VXI Crate
                    ---------------------------------------
 
 
***************** next diagram *******************
 
+------------+--------------+--------------------+------------+----------+
|  Two       |              |                    |            | VME i/f  |
| Front Panel|     16       |   Logic Module(s)  |            | for      +--+
| 34 way i/p +----/---------+   for Validation   |            | setup    |  |
|            |              |   (minimum 2)      +------+     | control  |  |
| For 16     |              |                    |      |     | testing  |P1|
| Validation |              |                    +----+ |     |          |  |
| and 16     +----+         |                    |    | |     |          |  |
| Fast Trig. |    |         +--------------------+    | |     |          |  |
| logic i/p's|    |                                   | |     +-+-----+--+--+
+------------+    |         +--------------------+    | |       |     |  |
|            |    |         |                    |    | |    +--+     |  |
| Analogue   |    |    16   |  Logic Module(s)   |    | |    |        |  +--+
|Multiplicity|    +---/-----+  for Fast Trigger  |    | |    |        +--+  |
| inputs and |              |  (minimum 2)       |    | |    |           |  |
| comparators|         3    |                    |    | |    |           |P2|
|            +--------/-----+                    +--+ | |    |           |  |
|8 Ge inputs |              |                    |  | | |    |           |  |
|8 BGO inputs|              +--------------------+  | | |    |           |  |
|            |                                      | | |    |           +--+
|            |                                      | | |    |           |
+------------+------------+  Fast Trig req.    2    | | |    |           |
| Outputs    |            |<------------------/-----+ | |    |           +--+
|            | Control    |  Validation req.   2      | |    |           |  |
|Fast Trigger| Logic      |<------------------/-------+ |    |           |  |
|Validation  |            |  Event reject req. 2        |    |           |P3|
|Event reject|            |<------------------/---------+    |           |  |
| 8 o/p each |            |                                  |           |  |
|time aligned|            |          6    +------------------+-+         |  |
+------------+            +---------/---->|  Scalers for       |         +--+
|Readout Comp|            |               |  Monitoring        |         |   
+------------+------------+---------------+--------------------+---------+   
 
 
 
 
 
 
 
         Fig 4 Simplified Block Diagram of Trigger Control Module 
         --------------------------------------------------------