End Event word format
Last revised: 11 June 1999
Word structure
| 24 |
23 | 22 |
21 | 20 |
19 | 18 |
17 | 16 |
15 | 14 |
13 | 12 |
11 | 10 |
9 | 8 |
7 | 6 |
5 | 4 |
3 | 2 |
1 | 0 |
| HD | DS | 1 | 1 |
L2B(2) |
L1T(2) |
Error Flags(8) |
PA |
Event Tag(8) |
| L2B | L2 Buffer id |
| L1T | L1 Trigger info |
| PA | Parity bit for this event |
Notes:
- The L1 Trigget info bits are a condesed summary of the L1 trigger decision. They are computed starting form the 64-bit L1 trigger word in the XTF-A board. The actual meaning of these two bits is described in the XTF documentation.
- The PArity bit is computed taking the bitwise XOR of all data words in
the event (23 bits/word) excluding the End Event word.
- The End Event word is a packet by itself and therefore has EP=EE=1 (bits 21 and 22)
Error Flags allocation
| 1 | bit 9 | PE | Parity Error |
| 2 | bit 10 | LS | Lost Sync |
| 3 | bit 11 | FO | Fifo Overflow |
| 4 | bit 12 | ID | Invalid Data |
| 5 | bit 13 | IO | Internal Overflow |
| 6 | bit 14 | TO | Truncated Output |
| 7 | bit 15 | GL | G-link Lost-lock |
| 8 | bit 16 | E2 | Parity Error in cable to Level 2 |
See also the document about
Error Handling in SVT
for more informations.
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SVT data words format page