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--- event_filter [2015/10/30 17:43]
pereira [CRDC packets]
+++ event_filter [2015/10/30 18:45]
pereira [CRDC packets]
@@ Line 342: / Line 342: @@
-  * **Samples "packets"**
+  * **Samples sub-packets**
-The Filter sends a series of sample "packets". Each "packet" consists of 1) one 16-bit word with information about the sample number:
+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 number   ^^^^^^^^   channel number  ^^^^^^|
+^  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 |
-and 2) four 16-bit words, each with energy information from a pad.
+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  ^    ^^^ connector ^^ energy ^^^^^^^^^|
+^  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 |
-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.

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