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Block diagram (also as postscript file available):
Inputs and Outputs | ||||
| Name | I/O | level | where | function |
|---|---|---|---|---|
| TRG | input | NIM | LEMO | Global trigger via fanout of the ENT board. |
| BIP-OR | input | TTL | LEMO | Combined BIP (Busy-In-Progress) signal from the TDCs delivered by the VFI board. |
| Ext. CLK | input | NIM | LEMO | External 50 MHz clock input, can be selected via a jumper (JP8) instead of the internal quartz oscillator |
| GPS flags | inputs | TTL | P2 VME backplane | GPS flags from the
VME-SG board
for 'fine-tuned' local clock time-stamping, selectable via jumpers
(JP7). pin C1 = GPS 1pps signal pin C2 = GPS rate pulse pin C4 = GPS time comp.1 pin C5 = GPS time comp.2 |
| TRG Test | output | NIM | LEMO | 40 nsec global trigger test output after a pulse shaper. |
| Ref. CLK | output | NIM | LEMO | 50 MHz reference clock output for the V533 fifos and the VFI board |
| Fifo Trigger | output | NIM | LEMO | Trigger output for the V533 fifos; combined logic OR of the global trigger, end-of-BIP trigger and GPS/LTC fine-tune trigger (if selected). |
| LTC rollover | output | TTL | P2 VME backplane | Local time clock rollover bit for 'raw-mode' GPS time referencing, selectable by jumpers (JP6) to go to the VME-SG board via the VME P2 connector (pin C14 = LTC rollover bit). |
| Local Time | outputs | RS485 | two 34-pin headers | 32-bit local time output to the V533 fifo(s); 20 nsec resolution. |
| Fifo Flags | outputs | RS485 | 10-pin header | Flag signals for the
V533 fifos. pins 1/2 = +/- End-of-BIP flag pins 3/4 = +/- GPS 'fine-tune' trigger flag pins 5/6 = +/- global trigger flag pins 7...10 = not used |
Jumpers, DIP Switches and Trimpots
See the board layout sketch
(postscript) for the positions of these:
|
pos 1/2 open pos 1/2 closed |
= enabled = disabled [DEFAULT] |
|
pos 3/4 pos 5/6 pos 7/8 pos 9/10 |
= GPS 1pps pulse = GPS rate pulse = GPS time comp.1 = GPS time comp.2 |
|
position 1/2 position 2/3 |
= external clock via Lemo input = internal quartz clock oscillator [DEFAULT] |
| dip switch position | selected delay time | |||||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| ON | ON | ON | ON | ON | ON | 0 [DEFAULT] |
| OFF | ON | ON | ON | ON | ON | 0 |
| ON | OFF | ON | ON | ON | ON | 20 nsec |
| OFF | OFF | ON | ON | ON | ON | 40 nsec |
| ON | ON | OFF | ON | ON | ||
