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event_filter [2015/11/01 08:25] pereira [Mesytec TDC (MTDC) packet] |
event_filter [2016/03/16 15:55] pereira [Mesytec TDC (MTDC) packet] |
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- | ====== Event Filter (S800 Filter) ====== | + | ====== |
+ | This page describes the data format assembled by the S800 filter. The data is written in a series of 16-bit unsigned integers, subsequently referred to as '' | ||
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+ | ===== General packet structure ===== | ||
+ | All data is written using the concept of " | ||
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+ | ^ Length ^ Packet Tag ^ Packet Data | | ||
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+ | Length: a count of the number of words in the packet, inclusive of the length word itself | ||
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+ | Packet Tag: a predefined integer indicating the type of data found in the Packet Data | ||
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+ | Packet Data: the data themselves. These can be data read from the modules or a sub packet. Sub packets have identical structure to main packets. Using this format all data can be placed in nested packets, and coding decisions on how to unpack the Packet Data can be made by examination of the preceding Packet Tag. Packets (including sub packets) can also be skipped by jumping ahead Length words in the buffer. | ||
- | The trigger bits words indicates which bits were set during the event. The encoding of the bits is the following: | ||
In this section, each 16-bit word sent by the Filter is described by a 16x3-table diagram. The first row includes the value, either in decimal or hexadecimal format, or a descriptive note. The second row shows the value in binary (" | In this section, each 16-bit word sent by the Filter is described by a 16x3-table diagram. The first row includes the value, either in decimal or hexadecimal format, or a descriptive note. The second row shows the value in binary (" | ||
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- | ==== Time-stamp packet ==== | + | |
+ | ===== Time-stamp packet | ||
The timestamp is encoded in the [[S800 USB DAQ data format#Tag 0x5803: XLM72 time stamp module|XLMV72 time-stamp module]] for each event as a 64-bit word. The Event Filter parses it as a set of four consecutive 16-bit words. | The timestamp is encoded in the [[S800 USB DAQ data format#Tag 0x5803: XLM72 time stamp module|XLMV72 time-stamp module]] for each event as a 64-bit word. The Event Filter parses it as a set of four consecutive 16-bit words. | ||
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- | ==== Event-number packet ==== | + | ===== Event-number packet |
The event-number is given by the VMUSB scaler channels as a 48-bit word coded in two 32-bit words. The Event Filter parses it and re-formats it as a three 16-bit words. | The event-number is given by the VMUSB scaler channels as a 48-bit word coded in two 32-bit words. The Event Filter parses it and re-formats it as a three 16-bit words. | ||
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- | ==== Trigger packet ==== | + | ===== Trigger packet |
The trigger packet includes a bit-pattern word (encoded | The trigger packet includes a bit-pattern word (encoded | ||
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- | ==== Time-of-flight packet ==== | + | ===== Time-of-flight packet |
The time-of-flight packet includes all the timing values encoded in the [[S800 USB DAQ data format#Tag 0x7186: Phillips 7186 TDC module for time-of-flights|Phillips TDC]] and the XFP-FP and OBJ-FP ToF from the ORTEC TACs encoded in the [[S800 USB DAQ data format#Tag 0x7167: Phillips 7164 ADC module for CRDC anodes (energies and TAC)|S800 Phillips 7164H ADC]]. | The time-of-flight packet includes all the timing values encoded in the [[S800 USB DAQ data format#Tag 0x7186: Phillips 7186 TDC module for time-of-flights|Phillips TDC]] and the XFP-FP and OBJ-FP ToF from the ORTEC TACs encoded in the [[S800 USB DAQ data format#Tag 0x7167: Phillips 7164 ADC module for CRDC anodes (energies and TAC)|S800 Phillips 7164H ADC]]. | ||
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- | ==== Scintillator packet ==== | + | ===== Scintillator packet |
The scintillator packet includes the energy (encoded in the [[S800 USB DAQ data format#Tag 0x4300: FERA module for plastic scintillator energies|FERA LeCroy module]]) and time (encoded in the [[S800 USB DAQ data format#Tag 0x7186: Phillips 7186 TDC module for time-of-flights|Phillips TDC]]) of the [[Detectors# | The scintillator packet includes the energy (encoded in the [[S800 USB DAQ data format#Tag 0x4300: FERA module for plastic scintillator energies|FERA LeCroy module]]) and time (encoded in the [[S800 USB DAQ data format#Tag 0x7186: Phillips 7186 TDC module for time-of-flights|Phillips TDC]]) of the [[Detectors# | ||
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- | ==== Ion-Chamber packet ==== | + | ===== Ion-Chamber packet |
The Ion-chamber packet includes the energies of the [[Detectors# | The Ion-chamber packet includes the energies of the [[Detectors# | ||
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- | ==== CRDC packets ==== | + | ===== CRDC packets |
The Filter provides two CRDC packets: one for [[Detectors|Cathode Readout Drift Chambers (CRDC)|CRDC1]] and one for [[Detectors|Cathode Readout Drift Chambers (CRDC)|CRDC2]]. Each CRDC packet is divided in two sub-packets: | The Filter provides two CRDC packets: one for [[Detectors|Cathode Readout Drift Chambers (CRDC)|CRDC1]] and one for [[Detectors|Cathode Readout Drift Chambers (CRDC)|CRDC2]]. Each CRDC packet is divided in two sub-packets: | ||
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- | ==== Hodoscope packet ==== | + | ===== Hodoscope packet |
The Filter parses the [[Detectors# | The Filter parses the [[Detectors# | ||
[[S800 USB DAQ data format#Tag 0x7165: Phillips 7164 ADC module for hodoscope energies 0 through 15|Phillips 7164 ADCs]] and re-formats the data in three packets, two with the energies of the two groups crystals (from 1 to 16 and from 17 to 32), and the third one with the hit pattern recorded in the [[S800 USB DAQ data format#Tag 0x4448: LeCroy4448 coincidence register module for hodoscope hit pattern|LeCroy 4448 coincidence-register module]]. | [[S800 USB DAQ data format#Tag 0x7165: Phillips 7164 ADC module for hodoscope energies 0 through 15|Phillips 7164 ADCs]] and re-formats the data in three packets, two with the energies of the two groups crystals (from 1 to 16 and from 17 to 32), and the third one with the hit pattern recorded in the [[S800 USB DAQ data format#Tag 0x4448: LeCroy4448 coincidence register module for hodoscope hit pattern|LeCroy 4448 coincidence-register module]]. | ||
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- | ==== TPPACs packet ==== | + | ===== TPPACs packet |
The Filter parses and re-formats information from the [[Detectors# | The Filter parses and re-formats information from the [[Detectors# | ||
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- | ==== Mesytec TDC (MTDC) packet ==== | + | ===== Mesytec TDC (MTDC) packet |
The MTDC packet includes the multiple timing values [[S800 USB DAQ data format#Tag 0x0DDC: Mesytec MTDC-32 module |encoded in the Mesytec MTDC]]. The packet looks like: | The MTDC packet includes the multiple timing values [[S800 USB DAQ data format#Tag 0x0DDC: Mesytec MTDC-32 module |encoded in the Mesytec MTDC]]. The packet looks like: | ||
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- | ^^^^^ hit ^^^^ channel ^^^^^^^| | + | ^ |
| 0 | 0 | 0 | X | X | X | X | X | X | X | X | X | X | X | X | X | | | 0 | 0 | 0 | X | X | X | X | X | X | X | X | X | X | X | X | X | | ||
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | | | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | | ||
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| X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | | | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | | ||
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | | | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | | ||
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+ | ===== Versioning system ===== | ||
+ | ATTENTION: This section needs to be updated!!!!! | ||
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+ | The detectors installed in the S800 and the data to be read from them often changes with the differing requirements of each experiment. This in turn impacts the details of the data format, and requires the use of a version number in order to be backward compatible. Subsequent changes to the S800 data acquisition will increment the version number of the data format and new configurations will be reflected in new packet tags. Documentation for these changes will be given here, in links accessible from the following table. The current version of the data format is indicated with a star. | ||
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+ | ^ S800_VERSION ^ Notes ^ Current Version | | ||
+ | | [[S800_VERSION 0x0004|0x0004]] | Last version using the SBS readout system, up to end December 2011 | | | ||
+ | | [[S800_VERSION 0x0005|0x0005]] | First version to use the VM/CC-USB parallel readout system, beginning January 2012 | | | ||
+ | | [[S800_VERSION 0x0006|0x0006]] | The S800_GALOTTE_PACKET is added for the Galotte MCP Object box detector | * | | ||
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