VME DAQ Rawdata Format
Raw data is stored as is from the hardware. Minimal quantum of data is 4 bytes (32 bits). Intel byte order is used.
Bit fields
Raw data word structure by bits, MSB left:
31 |
30 |
29 |
28 |
27 |
26 |
25 |
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 |
type |
data |
||||||||||||||||||||||||||||||
Type is one of the following:
type, bin |
type, hex |
code |
description |
0000 |
0 |
DATA |
Module data |
0001 |
1 |
||
0010 |
2 |
||
0011 |
3 |
||
0100 |
4 |
||
0101 |
5 |
||
0110 |
6 |
||
0111 |
7 |
||
1000 |
8 |
MHDR |
Module header |
1001 |
9 |
MTRL |
Module trailer |
1010 |
A |
EHDR |
Event header |
1011 |
B |
ETRL |
Event trailer |
1100 |
C |
SHDR |
Spill header |
1101 |
D |
STRL |
Spill trailer |
1110 |
E |
STAT |
Status |
1111 |
F |
DATA |
16-bit module data |
Structure
Raw data stream is split in spills beginning with SHDR and ending with STRL, the data in between is a sequence of zero or more events. Event begins with EHDR and ends with ETRL. The data between event header and trailer is a sequence of module data blocks. Module data starts with MHDR and ends with MTRL. Module data is any number of words of type DATA.
SHDR
- EHDR
- MHDR
- DATA
- ..
- ..
- MHDR
- ..
STRL ...
Details
SHDR
31 |
30 |
29 |
28 |
27 |
26 |
25 |
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 |
1 |
1 |
0 |
0 |
0 |
spill type |
reserved |
|||||||||||||||||||||||||
STRL
31 |
30 |
29 |
28 |
27 |
26 |
25 |
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 |
1 |
1 |
0 |
1 |
0 |
spill type |
reserved |
|||||||||||||||||||||||||
Spill type:
- 0 - Normal data
- 1 - End of spill data
- 2..15 - reserved
EHDR
31 |
30 |
29 |
28 |
27 |
26 |
25 |
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 |
1 |
0 |
1 |
0 |
reserved |
event number |
||||||||||||||||||||||||||
ETRL
31 |
30 |
29 |
28 |
27 |
26 |
25 |
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 |
1 |
0 |
1 |
1 |
reserved |
word count |
||||||||||||||||||||||||||
MHDR
31 |
30 |
29 |
28 |
27 |
26 |
25 |
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 |
1 |
0 |
0 |
0 |
slot number |
event number |
||||||||||||||||||||||||||
MTRL
31 |
30 |
29 |
28 |
27 |
26 |
25 |
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 |
1 |
0 |
0 |
1 |
reserved |
CBLT flags |
reserved |
word count |
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