Difference between revisions of "Overall trigger timing"
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| Line 17: | Line 17: | ||
<tr> | <tr> | ||
| − | <td> | + | <td>115 ns<br></td> |
<td>photon hits BCAL<br></td> | <td>photon hits BCAL<br></td> | ||
| − | <td>BCAL is | + | <td>125 ns to alcove, but BCAL is about 10 feet upstream on the platform<br></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
| − | <td> | + | <td>215 ns<br></td> |
<td>BCAL PMT signals reach discriminators<br></td> | <td>BCAL PMT signals reach discriminators<br></td> | ||
<td>20 ns in PMT plus 80 ns cable<br></td> | <td>20 ns in PMT plus 80 ns cable<br></td> | ||
| Line 29: | Line 29: | ||
<tr> | <tr> | ||
| − | <td> | + | <td>245 ns<br></td> |
<td>discriminator sum outputs available<br></td> | <td>discriminator sum outputs available<br></td> | ||
<td>30 ns a guess, but must be delayed before final AND in any case<br></td> | <td>30 ns a guess, but must be delayed before final AND in any case<br></td> | ||
| Line 37: | Line 37: | ||
<td>310 ns<br></td> | <td>310 ns<br></td> | ||
<td>Tagger MOR reaches final AND logic<br></td> | <td>Tagger MOR reaches final AND logic<br></td> | ||
| − | <td><br></td> | + | <td>230 ns + 80 ns? cable, see [[Tagger trigger timing]]<br></td> |
</tr> | </tr> | ||
| Line 43: | Line 43: | ||
<td>310 ns<br></td> | <td>310 ns<br></td> | ||
<td>discriminator sums reach final AND<br></td> | <td>discriminator sums reach final AND<br></td> | ||
| − | <td><br></td> | + | <td>Delayed to match MOR<br></td> |
</tr> | </tr> | ||
| Line 49: | Line 49: | ||
<td>325 ns<br></td> | <td>325 ns<br></td> | ||
<td>result of final AND reaches trigger supervisor<br></td> | <td>result of final AND reaches trigger supervisor<br></td> | ||
| − | <td><br></td> | + | <td>15 ns a guess through trigger logic<br></td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>370 ns<br></td> | <td>370 ns<br></td> | ||
| − | <td> | + | <td>trigger supervisor L1 accept ready<br></td> |
| − | <td><br></td> | + | <td>45 ns internal to TS<br></td> |
</tr> | </tr> | ||
| Line 61: | Line 61: | ||
<td>385 ns<br></td> | <td>385 ns<br></td> | ||
<td>gate reaches ADC crate<br></td> | <td>gate reaches ADC crate<br></td> | ||
| − | <td><br></td> | + | <td>15 ns a guess cable plus gate generator plus cable<br></td> |
</tr> | </tr> | ||
| − | + | <tr> | |
| − | + | <td>390 ns<br></td> | |
| − | + | <td>BCAL signals reach ADC crate<br></td> | |
| + | <td>20 ns in PMT plus 250 ns cable plus photon flight time<br></td> | ||
| + | </tr> | ||
</table> | </table> | ||
Revision as of 15:55, 20 July 2006
Below is my current understanding of the trigger timing for the BCAL test:
| Time |
What |
Comment |
| 0 ns |
electron hits tagger foil |
|
| 115 ns |
photon hits BCAL |
125 ns to alcove, but BCAL is about 10 feet upstream on the platform |
| 215 ns |
BCAL PMT signals reach discriminators |
20 ns in PMT plus 80 ns cable |
| 245 ns |
discriminator sum outputs available |
30 ns a guess, but must be delayed before final AND in any case |
| 310 ns |
Tagger MOR reaches final AND logic |
230 ns + 80 ns? cable, see Tagger trigger timing |
| 310 ns |
discriminator sums reach final AND |
Delayed to match MOR |
| 325 ns |
result of final AND reaches trigger supervisor |
15 ns a guess through trigger logic |
| 370 ns |
trigger supervisor L1 accept ready |
45 ns internal to TS |
| 385 ns |
gate reaches ADC crate |
15 ns a guess cable plus gate generator plus cable |
| 390 ns |
BCAL signals reach ADC crate |
20 ns in PMT plus 250 ns cable plus photon flight time |
