Difference between revisions of "Output data structure in CODA"
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The electron detector readout boards(v1495) are currently outputting data in the following format: | The electron detector readout boards(v1495) are currently outputting data in the following format: | ||
| − | == Event types defined == | + | == '''Event types defined''' == |
Event type 1 : Helicity Reversal events | Event type 1 : Helicity Reversal events | ||
Event type 2 : photon single events | Event type 2 : photon single events | ||
| Line 7: | Line 7: | ||
Event type 4 : coincidence of electron and photon single events | Event type 4 : coincidence of electron and photon single events | ||
| − | == Sub banks used == | + | |
| + | ==''' Sub banks used''' == | ||
Single Event Data from Slave-1: 0x201 | Single Event Data from Slave-1: 0x201 | ||
Single Event Data from Slave-2: 0x202 | Single Event Data from Slave-2: 0x202 | ||
| Line 20: | Line 21: | ||
Parameter information about Slave-3 : 0x209 | Parameter information about Slave-3 : 0x209 | ||
| − | |||
| − | == Structure inside Parameter info sub-bank == | + | == '''Structure inside Parameter info sub-bank''' == |
0x207: parameter information about slave-1 | 0x207: parameter information about slave-1 | ||
0x208: parameter information about slave-2 | 0x208: parameter information about slave-2 | ||
| Line 48: | Line 48: | ||
[[Image:EDet parameterInfo format.PNG]] | [[Image:EDet parameterInfo format.PNG]] | ||
| − | == Structure inside Accumulation sub-bank == | + | |
| + | == '''Structure inside Accumulation sub-bank''' == | ||
The accumulation data from electron detector goes into three sub-banks | The accumulation data from electron detector goes into three sub-banks | ||
| Line 69: | Line 70: | ||
[[Image:EDet_accum_format.png]] | [[Image:EDet_accum_format.png]] | ||
| − | + | One can see 32 words, because each bank has information from each slave. Each slave carries information of 32 strips from all 4 planes. | |
| + | |||
| − | == Structure inside single-event subbank== | + | == '''Structure inside single-event subbank'''== |
The single event data from electron detector goes into three subbank | The single event data from electron detector goes into three subbank | ||
0x201: singles from slave-1 | 0x201: singles from slave-1 | ||
Revision as of 21:53, 23 February 2011
The electron detector readout boards(v1495) are currently outputting data in the following format:
Event types defined
Event type 1 : Helicity Reversal events Event type 2 : photon single events Event type 3 : electron single events Event type 4 : coincidence of electron and photon single events
Sub banks used
Single Event Data from Slave-1: 0x201 Single Event Data from Slave-2: 0x202 Single Event Data from Slave-3: 0x203
Accumulation Data from Slave-1 : 0x204 Accumulation Data from Slave-2 : 0x205 Accumulation Data from Slave-3 : 0x206
Parameter information about Slave-1 : 0x207 Parameter information about Slave-2 : 0x208 Parameter information about Slave-3 : 0x209
Structure inside Parameter info sub-bank
0x207: parameter information about slave-1 0x208: parameter information about slave-2 0x209: parameter information about slave-3
Each sub-bank has nine words, each 32 bit in the following order
Identifier beginning word Firmware Revision Number A mask B mask D mask E mask PWTL(8 bits) | PWDL(8 bits) | HOLDOFF(8 bits) | PL_Delay(8 bits) Rejection Width(16 bits) | Accum trigger condition(8 bits) | Event trigger condition(8 bits) Identifier ending word
The respective slave identifier words are:
slave # beginning ending slave 1 0xb1000000 0xb100000f slave 2 0xb2000000 0xb200000f slave 3 0xb3000000 0xb300000f
As a visual example, the sub-bank parameter information as saved in run # 4042(taken Feb 2011) is shown in the following image.
Structure inside Accumulation sub-bank
The accumulation data from electron detector goes into three sub-banks
0x204: accumulation from slave-1 0x205: accumulation from slave-2 0x206: accumulation from slave-3
Each sub-bank has thirty-two words of 32 bits. Each word has the following format.
Most significant byte(bits 32-23): no.of hits in plane-1 Next significant byte(bits 24-17): no.of hits in plane-2 Next significant byte(bits 16-09): no.of hits in plane-3 Least significant byte(bits 01-08): no.of hits in plane-4
The words are organized in order of increasing strips. For example in the following snapshot displaying data from bank 0x205(slave-2)
1st word has accumulation data of strip-1, 2nd word has accumulation data of strip-2, ... and so on
For this run, a dummy input was given to pin numbers which correspond to strip # 1, 3 and 5 of patch-2 at a rate of 2.4kHz, the MPS was @1 kHz.
One can see 32 words, because each bank has information from each slave. Each slave carries information of 32 strips from all 4 planes.
Structure inside single-event subbank
The single event data from electron detector goes into three subbank
0x201: singles from slave-1 0x202: singles from slave-2 0x203: singles from slave-3
Each sub-bank has five 32 bit words in the following format.
1st word: hit-map on plane-1 for strip 1 through 32 2nd word: hit-map on plane-2 for strip 1 through 32 3rd word: hit-map on plane-3 for strip 1 through 32 4th word: hit-map on plane-4 for strip 1 through 32 5th word: (some redundant information) 0x00000(20 bits) | Helicity(1 bit) | raw_trig_CNT (11 bits)
Following is a snapshot of the data bank as seen through xcefdmp.
Details:
- The above snapshot displays the 32 bits in hexadecimal format. In the first 4 words, the least significant bit represent hit-information of strip-1 for all the 4 planes.
- Successively, the higher order bits represent hit-information for each next strip. Thus the 32 bits word has the hit-information of the 32 strips in this patch of data.
- The 5th word (currently) has the information whether this data correspond to positive or negative helicity. followed by the total number of trigger that were received during the previous helicity period.
- (I intend to add the buffer status in the 5th word, which now has zero's)
Similarly, data from s2 and s3 contains the hit map of strip 33-64 and 65-96 on all planes respectively in the above order.
This pattern can be changed with ease, but this is the format in which the most recent data files are found.
