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--- event_filter [2015/11/01 08:29]
pereira [Mesytec TDC (MTDC) packet]
+++ 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 642: / Line 655: @@
-^   ^^^^  hit  ^^^^ channel ^^^^^^^|
+^   ^^^  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 |

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