TQDC16VS-E Data Format
Hardware TQDC16VS-E
TQDC16VS-E payload data is encapsulated in M-Stream 2.2 protocol using Data Subtype 0.
M-Stream Header |
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word # |
byte offset |
bits |
description |
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0 |
0 |
31:24 |
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23:18 |
Flags |
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17:16 |
Subtype |
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15:0 |
Fragment length |
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1 |
4 |
31:16 |
Fragment ID bits [15:0] |
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15:0 |
Fragment offset code |
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M-Stream Subtype 0, first fragment |
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2 |
8 |
31:0 |
Device Serial |
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3 |
12 |
31:28 |
reserved |
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27:24 |
trig_pos |
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23:0 |
Event number |
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4 |
16 |
31:0 |
Event timestamp, TAI seconds |
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5 |
20 |
31:2 |
Event timestamp, TAI nanoseconds |
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1:0 |
Event timestamp, TAI flags |
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6 |
24 |
31:0 |
Event Data |
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... |
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N-1 |
4*(N-1) |
31:0 |
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M-Stream Subtype 0, next fragments |
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2 |
8 |
31:0 |
Event Data |
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... |
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N-1 |
4*(N-1) |
31:0 |
TQDC16VS-E Event Data
word # |
byte offset |
bits |
description |
0 |
0 |
31:0 |
TDC Data Block (S1 bytes) |
... |
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S1/4-1 |
S1-4 |
31:0 |
|
S1/4 |
0 |
31:0 |
ADC Data Block (S2 bytes) |
... |
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(S1+S2)/4-1 |
S1+S2-4 |
31:0 |
TDC Data Block
word # |
byte offset |
bits |
description |
0 |
0 |
31:28 |
TDC Data Type |
27:16 |
reserved |
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15:0 |
Data length (in bytes) |
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1 |
4 |
31:0 |
TDC Data Payload |
... |
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N-1 |
4*(N-1) |
31:0 |
TDC data type is 0x0.
TDC Data Payload
2 - TDC event header |
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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 |
2 |
reserved |
Event number |
TDC timestamp |
TDC timestamp in number of 25 ns time intervals since global trigger timestamp found in event header.
3 - TDC event trailer |
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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 |
3 |
reserved |
Event number |
TDC word count |
4, mode=0 - TDC data |
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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 |
4 |
reserved |
channel |
data |
rcdata |
5 - TDC and ADC data, select by mode field |
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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 |
5 |
reserved |
channel |
data |
rcdata |
Channels 16-31 are reserved.
TDC time measurement
- data bits 18:0 = number of 100 ps time intervals since global trigger timestamp found in event header. When 25 ps mode is active, use rcdata[1:0] for 2 LSB bits of time measurement.
6 - TDC error |
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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 |
6 |
reserved |
TDC error flags |
TDC error flags bits:
- [0] Hit lost in group 0 from read-out fifo overflow
- [1] Hit lost in group 0 from L1 buffer overflow
- [2] Hit error have been detected in group 0
- [3] Hit lost in group 1 from read-out fifo overflow
- [4] Hit lost in group 1 from L1 buffer overflow
- [5] Hit error have been detected in group 1
- [6] Hit lost in group 2 from read-out fifo overflow
- [7] Hit lost in group 2 from L1 buffer overflow
- [8] Hit error have been detected in group 2
- [9] Hit lost in group 3 from read-out fifo overflow
- [10] Hit lost in group 3 from L1 buffer overflow
- [11] Hit error have been detected in group 3
- [12] Hits rejected because of programmed event size limit
- [13] Event lost (trigger FIFO ovefrlow)
- [14] Internal fatal chip error has been detected
Most important error bits are 12 and 13. Error bit 14 should be ignored.
For detailed description of TDC please refer to HPTDC manual.
ADC Data Block
word # |
byte offset |
bits |
description |
0 |
0 |
31:28 |
ADC Data Type |
27:16 |
Channel number |
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15:0 |
Data length (in bytes) |
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1 |
4 |
31:0 |
ADC Data Payload |
... |
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N-1 |
4*(N-1) |
31:0 |
ADC data type is 0x1.