S800 Documentation

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====== Event Filter (S800 Filter) ======

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 ("X"s are used to describe arbitrary values that vary from event to event). The last row shows the bit number. 



==== 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.


  * **Packet Length** (self-inclusive)

^    5    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Packet Tag**

^    0x5803    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **First 16-bit time-stamp word**

^  First 16-bits "chunk" of time-stamp  ^^^^^^^^^^^^^^^|
| 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 |


  * **Second 16-bit time-stamp word**

^  Second 16-bits "chunk" of time-stamp  ^^^^^^^^^^^^^^^|
| 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 |


  * **Third 16-bit time-stamp word**

^  Third 16-bits "chunk" of time-stamp  ^^^^^^^^^^^^^^^|
| 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 |


  * **Fourth 16-bit time-stamp word**

^  Fourth 16-bits "chunk" of time-stamp  ^^^^^^^^^^^^^^^|
| 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 |




==== 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.


  * **Packet Length** (self-inclusive)

^    4    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Packet Tag**

^    0x5804    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **First 16-bit event-number word**

^  First 16-bits "chunk" of event-number  ^^^^^^^^^^^^^^^|
| 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 |


  * **Second 16-bit event-number word**

^  Second 16-bits "chunk" of event-number  ^^^^^^^^^^^^^^^|
| 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 |


  * **Third 16-bit event-number word**

^  Third 16-bits "chunk" of event-number  ^^^^^^^^^^^^^^^|
| 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 |





==== Trigger packet ====
The trigger packet includes a bit-pattern word (encoded  by the [[S800 USB DAQ data format#Tag 0x2367: Trigger module|ULM trigger module]]), with information about what sources triggered the event, and their corresponding time from the [[S800 USB DAQ data format#Tag 0x7186: Phillips 7186 TDC module for time-of-flights|Phillips 7186 TDC]].


  * **Packet Length** (self-inclusive)

^    A number from 2 to 7    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Packet Tag**

^    0x5801    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Trigger pattern**

^  ^^^^^^^^^^^   Bit pattern   ^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |

the encoding of the active bits is given by the following table:

^ Bit ^ Source |
|0| S800 (from E1 up)  |
|1| Coincidence |
|2| External 1 |
|3| External 2 |
|4| Secondary (e.g. GRETINA)  |


  * **Trigger time**

The time of each trigger source (except for "coincidences") is given by a word that look like:

^  ^^^ Ch ^  time   ^^^^^^^^^^^|
| 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 |


there can be up to four time words (depending on whether **time** is greater than 0), one for each channel. The channel number Ch is given by:

^ Ch ^ Source  |
| 8 | S800 (from E1 up)  |
| 9 | External 1  |
| 10 | External 2  |
| 11 | Secondary (e.g. GRETINA)  |




==== 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]]. 


  * **Packet Length** (self-inclusive)

^    A number from 2 to 10    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Packet Tag**

^    0x5802    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Time-of-flight values**
The time-of-flight information for each channel is coded in words that look like:

^  ^^^ Ch ^  time  ^^^^^^^^^^^|
| 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 |

Up to eight of these words can be present (depending on wheter **time** is greater than 0): six from the Phillips TDC, and two from the XFP-FP and OBJ-FP TACs. The channel number Ch is given by:

^ Ch ^ Source  |
| 6 | Phillips TDC time from the A1900 IM2 north scintillator (optional)  |
| 7 | Phillips TDC time from the A1900 IM2 south scintillator (optional)  | 
| 12 | Phillips TDC time from the RF    |
| 13 | Phillips TDC time from the OBJ scintillator  |  
| 14 | Phillips TDC time from the XFP scintillator  |  
| 15 | Phillips TDC time from the LaBr (optional)  |  
| 4 | XFP-FP time-of-flight from TAC  | 
| 5 | OBJ-FP time-of-flight from TAC  | 


Note that the time values from the Phillips TDC are subtracted by SpecTcl to the time from the S800 trigger E1 up (encoded in the [[#trigger packet|trigger packet]]) in order to calculate the corresponding time-of-flight. On the other hand, the times from the TACs (Ch 4 and 5) correspond to actual time-of-flight values. 




==== 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#Plastic scintillators|S800 FP scintillator]] signals. In the original configuration, there were 3 scintillators (E1, E2, and E3) which were later reduced to just one (E1) after the installation of the Hodoscope. 


  * **Packet Length** (self-inclusive)

^    A number from 4 to 8    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X | X |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Packet Tag**

^    0x5810    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Energy and time values**
The energy (from the FERA module) and time (from the Phillips TDC) are given by two consecutive words: 

^  ^^^ Ch ^ ^ energy  ^^^^^^^^^^|
| 0 | 0 | 0 | X | 0 | 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 |


^  ^^^ Ch ^ time  ^^^^^^^^^^^|
| 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 |


These words are sent by the Filter as long as **energy** is greater than 0 or **Ch** equals 2. The channel assignment given by the Filter is:

^ Channel ^ Source |
| 0 | E1 up |
| 1 | E1 down |
| 2 | Empty |








==== Ion-Chamber packet ====
The Ion-chamber packet includes the energies of the [[Detectors#Ionization chamber|16 ion-chamber segments]] encoded in one of the [[S800 USB DAQ data format#Tag 0x7164: Phillips 7164 ADC module for ion chamber energies|Phillips 7164H ADC]].


  * **Packet Length** (self-inclusive)

^    A number from 4 to 18    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Packet Tag**

^    0x5820    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |



  * **Sub-packet "Energy" Tag**

^    0x5821    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |



  * **Sub-packet "Energy" Length** (self-inclusive)

^   A number from 2 to 16    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |




  * **Energy values**
The energy (from the Phillips 7164H ADC module) is given by a series of words that look like: 

^  ^^^ Ch ^   energy   ^^^^^^^^^^^|
| 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 |


where Ch is the segment number (from 0 to 15, being segment 0 the most upstream). The Filter gives an energy word for each segment as long as **energy** is greater than 0.




==== 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 "Raw" sub-packet with information about the pads energies (encoded in the [[S800 USB DAQ data format#Tag 0xCFDC: XLM72V crdc1 pad readout module|CRDCs XLM72 modules]]), and the "Anode" sub-packet with anode energy and time information encoded in the CRDCs [[S800 USB DAQ data format#Tag 0x7167: Phillips 7164 ADC module for CRDC anodes (energies and TAC)|Phillips ADC]]. In the following, we describe the structure of the packet provided by the Filter for each CRDC.

  * **Packet Length** (self-inclusive)

^    A number from 10 to 330    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 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 |


  * **Packet Tag**

^    0x5840    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |



  * **CRDC label**

^    0x0000 or 0x0001   ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |

where 0x0000 and 0x0001 identify CRDC1 and CRDC2, respectively.



  * **CRDC Sub-packet "Raw" Length** (self-inclusive)

^   A number from 3 to 323    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 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 |



  * **CRDC Sub-packet "Raw" Tag** 

^    0x5841    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |



  * **Global threshold** 

^    0x0000    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |

This word is reserved for a global threshold; it is no longer used, so it is set to 0 



  * **Samples sub-packets**
The Filter sends a series of sample sub-packets. Each sub-packet consists of two parts. The first part includes one 16-bit word with information about the **sample** and **channel** numbers:

^  control bit  ^   sample    ^^^^^^^^^   channel   ^^^^^|
| 1 | 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 |

where **channel** is a number between 0 and 63, and refers to a group of four pads. The second part includes __up to four__ consecutive 16-bit words, each with a pad energy __greater than 0__:

^  control bit  ^  empty  ^^^  connector  ^^  energy  ^^^^^^^^^|
| 0 | 0 | 0 | 0 | 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 |

The **connector** number is related to the pad number (**pad**) according to: **pad** = **channel** + **connector** x 64 (where **connector** ranges from 0 to 3, and **channel** is given by the first word of the sample sub-packet). Note that the Filter processes information from connectors with energies greater than 0. 





  * **CRDC Sub-packet "Anode" Length** (self-inclusive)

^    4    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |



  * **CRDC Sub-packet "Anode" Tag** 

^    0x5845    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |




  * **Energy from Anode**
The anode energy (encoded in the [[S800 USB DAQ data format#Tag 0x7167: Phillips 7164 ADC module for CRDC anodes (energies and TAC)|S800 Phillips 7164H ADC]]) is given by: 

^  empty  ^^^^   energy   ^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 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 |



  * **Time from Anode**
The anode time (from an ORTEC TAC encoded in the [[S800 USB DAQ data format#Tag 0x7167: Phillips 7164 ADC module for CRDC anodes (energies and TAC)|S800 Phillips 7164H ADC]]) is given by: 

^  empty ^^^^   time   ^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 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 |










==== Hodoscope packet ====
The Filter parses the [[Detectors#Hodoscope|Hodoscope]] information encoded in the two 
[[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]].

Each of the **two first packets** look like:

  * **Packet Length** (self-inclusive)

^    A number from 3 to 19    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Packet Tag**

^    0x58B0    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Hodoscope Sub-packet "Energy" Tag** 


^    0x0000 or 0x0001    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |

where 0x0000 labels the energy sub-packet of the first group of crystals from 1 to 16, and 0x00001 labels the second group of crystals from 17 to 32.



  * **Energy values**
The energy from each of the two Phillips 7164H ADC modules is given by a series of words that look like: 

^  ^^^ Ch ^   energy   ^^^^^^^^^^^|
| 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 |


where Ch is the crystal number in the packet (from 0 to 15). The Filter gives an energy word for each crystal as long as **energy** is greater than 0.





The **third hodoscope packet** with information from the coincidence register looks like:

  * **Packet Length** (self-inclusive)

^    5    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Packet Tag**

^    0x58B0    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Hit pattern** 


^    hit pattern of first 16 crystals   ^^^^^^^^^^^^^^^|
| 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 |



^    hit pattern of crystals 16 to 32   ^^^^^^^^^^^^^^^|
| 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 |



  * **Time**
The Hodoscope OR time (from an ORTEC TAC encoded in the [[S800 USB DAQ data format#Tag 0x7167: Phillips 7164 ADC module for CRDC anodes (energies and TAC)|S800 Phillips 7164H ADC]]) is given by: 

^  empty ^^^^   time   ^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 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 |




==== TPPACs packet ====
The Filter parses and re-formats information from the [[Detectors#Tracking Parallel Plate Avalanche Counters (TPPAC)|Tracking PPACs]] encoded in the [[S800 USB DAQ data format#Tag 0x5870: XLM72V tracking ppac readout module|XLM72 TPPACs module]]. The new packet includes both TPPACs; its structure is very similar to that from the CRDCs.

  * **Packet Length** (self-inclusive)

^    A number from 5 to 325    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 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 |


  * **Packet Tag**

^    0x5870    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **TPPAC Sub-packet "Raw" Length** (self-inclusive)

^   A number from 3 to 323    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 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 |



  * **TPPAC Sub-packet "Raw" Tag** 


^    0x5871    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 1 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |



  * **Global threshold** 

^    0x0000    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |

This word is reserved for a global threshold; it is no longer used, so it is set to 0 



  * **Samples sub-packets**
The Filter sends a series of sample sub-packets. Each sub-packet consists of two parts. The first part includes one 16-bit word with information about the **sample** and **channel** numbers:

^  control bit  ^   sample    ^^^^^^^^^   channel   ^^^^^|
| 1 | 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 |

where **channel** is a number between 0 and 63, and refers to a group of four pads. The second part includes __up to four__ consecutive 16-bit words, each with a pad energy __greater than 0__:

^  control bit  ^  empty  ^^^  connector  ^^  energy  ^^^^^^^^^|
| 0 | 0 | 0 | 0 | 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 |

The **connector** number is defined between 0 and 3, and it is related to the pad number (**pad**). The value 0 refers to the first 64 pads, and correspond to the strips in the dispersive direction of the first TPPAC. The value 1 is for pads between 63 and 127, and includes the strips in the non-dispersive direction of the first TPPAC. The value 2 corresponds to pads between 128 and 191, which are associated to the strips in the dispersive direction of the second TPPAC. Finally, the value 3 corresponds to pads between 191 to 256, and covers the strips in the non-dispersive direction of the second TPPAC.

The value of **pad** is given by **index** + **connector** x 64, where **index** is depends on the value of **channel** and **connector** according to the table below, where the second column shows the index values for **connector**=0 or 2, and the third column corresponds to the index values for **connector**=1 or 3:

^channel^index^index|   
|0|30|0|
|1|31|1|
|2|28|2|
|3|29|3|
|4|26|4|
|5|27|5|
|6|24|6|
|7|25|7|
|8|22|8|
|9|23|9|
|10|20|10|
|11|21|11|
|12|18|12|
|13|19|13|
|14|16|14|
|15|17|15|
|16|14|16|
|17|15|17|
|18|12|18|
|19|13|19|
|20|10|20|
|21|11|21|
|22|8|22|
|23|9|23|
|24|6|24|
|25|7|25|
|26|4|26|
|27|5|27|
|28|2|28|
|29|3|29|
|30|0|30|
|31|1|31|
|32|33|63|
|33|32|62|
|34|35|61|
|35|34|60|
|36|37|59|
|37|36|58|
|38|39|57|
|39|38|56|
|40|41|55|
|41|40|54|
|42|43|53|
|43|42|52|
|44|45|51|
|45|44|50|
|46|47|49|
|47|46|48|
|48|49|47|
|49|48|46|
|50|51|45|
|51|50|44|
|52|53|43|
|53|52|42|
|54|55|41|
|55|54|40|
|56|57|39|
|57|56|38|
|58|59|37|
|59|58|36|
|60|61|35|
|61|60|34|
|62|63|33|
|63|62|32|





==== 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:


  * **Packet Length** (self-inclusive)

^    A number from 2 to 10    ^^^^^^^^^^^^^^^|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Packet Tag**

^    0x58E0    ^^^^^^^^^^^^^^^|
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |


  * **Time values**
Every time value encoded in the MTDC is sent by the Filter as a series of two 16-bit words: the first one provides information about the MTDC channel and the hit number; the second one gives the time value for that channel-hit. In the current version (Oct. 2015), the Filter processes up to 32 hits per channel. This value can be increased if necessary.


^   ^^^  hit  ^^^^^ channel ^^^^^^^|
| 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 |



^   time   ^^^^^^^^^^^^^^^|
| 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 |
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