CAEN V767 128 Channel Gen. Purpose MH TDC - Physics
CAEN V767 128 Channel Gen. Purpose MH TDC - Physics
CAEN V767 128 Channel Gen. Purpose MH TDC - Physics
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02/07/2003 <strong>V767</strong> User's Manual – Rev.4<br />
1.2.5. COMMON STOP EMULATION<br />
The COMMON STOP operation is not foreseen by the <strong>TDC</strong> chips. However it can be<br />
easily implemented with the following scheme:<br />
<strong>V767</strong><br />
HITS<br />
CH[1..127]<br />
CH0<br />
COMMON STOP<br />
TRIGGER<br />
Fig. 1.6: Common Stop Emulation<br />
by programming the board in STOP TRIGGER MATCHING mode, with the TRIGGER<br />
WINDOW ending with the occurrence of the TRIGGER/STOP signal (see Fig. 1.7).<br />
0<br />
EVENT<br />
1 2 3 4 5 6 7 8 9<br />
HIT ch[1..127]<br />
0<br />
window<br />
Fig. 1.7: Common Stop Sequence<br />
COMMON STOP (CH0)<br />
TRIGGER<br />
The stored data consist in an absolute time measurement (the zero time reference is<br />
represented by the RESET) ; the timing information of the STOP (T_stop - T_hit) can be<br />
easily obtained by the software. The event is stored in the local buffer of the board with<br />
the following structure:<br />
HEADER event n. 1<br />
DATUM n.1 HIT time(4)<br />
DATUM n.2 HIT time(5)<br />
DATUM n.3 HIT time(6)<br />
DATUM n.4 HIT time(7)<br />
DATUM n.5 HIT time(8)<br />
DATUM n.6 STOP time<br />
EOB num. of data read = 6<br />
NPO:<br />
00001/97:<strong>V767</strong>x.MUTx/04 Page 12 of 75
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