ROAD-HIT packet format
As the Hit Buffer (HB) receives roads from the Associative Memory
Sequencer (AMS), it sends the needed data to the Track Fitter(s) (TF).
For each road received the HB forms a Road-Hit packet that contains
all the hits that belong to that road (both SVX hits and XFT tracks) ordered
by layer (0 first, 5 (XFT) last). If one layer has more then one hits,
they are all sent in the same order as they have been received by the
HB before the next layer date are sent. If a layer has no hits, it is
skipped.
The XFT track is sent as two
consecutive data words both with EP=0, the TF will use the layer info
in the first such word to know how to deal with both.
The packet is closed by a word containg the road data received from the
AMS, and with EP=1.
Packet 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 | 0 | 0 |
Layer(0..4) | SVX hit |
| HD | DS | 0 | 0 |
Layer(0..4) | SVX hit |
| HD | DS | 0 | 0 |
Layer(0..4) | SVX hit |
| HD | DS | 0 | 0 |
. . . |
. . . |
| HD | DS | 0 | 0 |
5 | XTF 1st word |
|
| HD | DS | 0 | 0 |
XTF 2nd word |
| HD | DS | 0 | 0 |
5 | . . . |
| HD | DS | 0 | 0 |
. . . |
| HD | DS | 0 | 1 |
road |
The format (bits 0-20 allocation) for the various words is in the
HITS,
ROADS and
XTF_tracks pages.
The format of the data for the tracks (if any) fitted from data in this packet is in the TRACK page
BACK to the
SVT data words format page