SVT data words on cables
Last updated 28 August 1998
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All data flow to,within and from SVT on 25 bit data links.
Bits are numbered 24..0. The 2 most significant bits 24 and 23 handshake the
data transfer. thery are HOLD (HD) and the data strobe clock (DS).
The next two bits 22 and 21 are common to all words and
implement the data protocol
at the next level, they are End Event (EE) and End Packet (EP).
Details about the connectors, the electrical
protocol of front panel Input/Output and the EE/EP protocol
are in the postscript document about
XTRP/SVT/Level2 interface. Also available as
CDF note 4578.
An older and OUT-OF-DATE version of the information in this
and related web pages can be
found in
SVT note 54.
Althugh some of what is in that note is not
valid anymore, it is mostly correct and has a neat compact look.
Generic SVT data word
| 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 | EE | EP |
Data Bits |
Specific cases:
- End Event word (same for everybody!)
- XTRP to SVT from XTF (XTrtp Fanout) board
- XTF tracks internal SVT format for XFT tracks as sent from XTF board to AMS and HB
- HITS from HitFinders to AMS and HB
- ROADS from AMS to HB
- Road_Hit Road-Hits packes from HB to TF
- TRACKS from Track Fitters to Level-2 receiver board
- Track Info from Level-2 receiver board to Level-2 Processor (Alpha's)
Stefano Belforte (
stefano.belforte@ts.infn.it)