Differences

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--- event_filter [2015/10/31 12:20]
pereira [CRDC packets]
+++ event_filter [2016/03/16 15:36]
pereira [S800 data format from Event Filter (S800 Filter)]
@@ Line 1: / Line 1: @@
-====== Event Filter (S800 Filter) ======
+====== S800 data format from 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 ''words''. This format is suitable for the output of most of the modules presently used in the S800, and in the case where 32 bit integers are needed, the proper unpacking procedures will be given.
+===== General packet structure =====
+All data is written using the concept of "packets". The format of a packet is:
+^ Length ^ Packet Tag ^ Packet Data |
+Length: a count of the number of words in the packet, inclusive of the length word itself
+Packet Tag: a predefined integer indicating the type of data found in the Packet Data
+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 ("X"s are used to describe arbitrary values that vary from event to event). The last row shows the bit number.
@@ Line 283: / Line 296: @@
-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.
+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.
@@ Line 403: / Line 416: @@
-==== Intermediate-image PPACs packet ====
+==== Hodoscope packet ====
-The Filter provides a PPAC packet: 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.
+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 10 to 330    ^^^^^^^^^^^^^^^|
+^    A number from 3 to 19    ^^^^^^^^^^^^^^^|
-| 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X | X |
+| 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 |
@@ Line 415: / Line 431: @@
   * **Packet Tag**
-^    0x5840    ^^^^^^^^^^^^^^^|
+^    0x58B0    ^^^^^^^^^^^^^^^|
-| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
+| 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**
-  * **CRDC label**
-^    0x0000 or 0x0001   ^^^^^^^^^^^^^^^|
+^    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.
+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.
-  * **CRDC Sub-packet "Raw" Length** (self-inclusive)
+  * **Energy values**
+The energy from each of the two Phillips 7164H ADC modules is given by a series of words that look like:
-^   A number from 3 to 323    ^^^^^^^^^^^^^^^|
+^  ^^^ Ch ^   energy   ^^^^^^^^^^^|
-| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 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 |
+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.
-  * **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**
+The **third hodoscope packet** with information from the coincidence register looks like:
-^    0x0000    ^^^^^^^^^^^^^^^|
+  * **Packet Length** (self-inclusive)
-| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
+^    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 |
-This word is reserved for a global threshold; it is no longer used, so it is set to 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 |
-  * **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   ^^^^^|
+  * **Hit pattern**
-| 1 | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X |
+^    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 |
-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 |
+^    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 |
-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.
+  * **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 |
-  * **CRDC Sub-packet "Anode" Length** (self-inclusive)
-^    4    ^^^^^^^^^^^^^^^|
-| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 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**
-  * **CRDC Sub-packet "Anode" 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 |
-^    0x5845    ^^^^^^^^^^^^^^^|
-| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 |
+  * **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**
-  * **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   ^^^^^^^^^^^|
+^    0x5871    ^^^^^^^^^^^^^^^|
-| 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X | X | X | X | X |
+| 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 |
-  * **Time from Anode**
+  * **Global threshold**
-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   ^^^^^^^^^^^|
+^    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|
-^        ^^^^^^^^^^^^^^^|
-| X | X | X | X | X | X | X | X | X | X | X | X | X | X | X | X |
+==== 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.
-^    Bit    ^^^^^^^^^^^^^^^|
+^   ^^^  hit  ^^^^^ channel ^^^^^^^|
-| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
+| 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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