FragmentHeader v3¶
This document describes the format of the FragmentHeader class, version 3. It should not be updated, but rather kept as a historic record of the data format for this version.
FragmentHeader Description¶
A FragmentHeader version 3 consists of 20 32-bit words:
-
Marker (0x11112222)
-
Version (0x00000003)
-
Size in bytes, including header and Fragment payload (upper 32 bits)
-
Size in bytes, including header and Fragment payload (lower 32 bits)
-
Trigger number (upper 32 bits)
-
Trigger number (lower 32 bits)
-
Trigger timestamp (upper 32 bits)
-
Trigger timestamp (lower 32 bits)
-
Data window begin (upper 32 bits)
-
Data window begin (lower 32 bits)
-
Data window end (upper 32 bits)
-
Data window end (lower 32 bits)
-
Run Number
-
Error bits
-
Fragment Type
-
Sequence Number (16b) / Padding
-
GeoID version 1 Component Type (upper 16 bits), Region ID (lower 16 bits)
-
GeoID version 1 Element ID
-
GeoID version 1 Version
-
GeoID version 1 Pad Word
C++ code for FragmentHeader¶
using run_number_t = uint32_t;
using trigger_number_t = uint64_t;
using fragment_type_t = uint32_t;
using fragment_size_t = uint64_t;
using timestamp_t = uint64_t;
using sequence_number_t = uint16_t;
struct FragmentHeader
{
static constexpr uint32_t s_fragment_header_marker = 0x11112222;
static constexpr uint32_t s_fragment_header_version = 3;
static constexpr uint32_t s_default_error_bits = 0;
uint32_t fragment_header_marker = s_fragment_header_marker;
uint32_t version = s_fragment_header_version;
fragment_size_t size{ TypeDefaults::s_invalid_fragment_size };
trigger_number_t trigger_number{ TypeDefaults::s_invalid_trigger_number };
timestamp_t trigger_timestamp{ TypeDefaults::s_invalid_timestamp };
timestamp_t window_begin{ TypeDefaults::s_invalid_timestamp };
timestamp_t window_end{ TypeDefaults::s_invalid_timestamp };
run_number_t run_number{ TypeDefaults::s_invalid_run_number };
uint32_t error_bits{ s_default_error_bits };
fragment_type_t fragment_type{ TypeDefaults::s_invalid_fragment_type };
sequence_number_t sequence_number {TypeDefaults::s_invalid_sequence_number };
uint16_t unused {0xFFFF};
GeoID link_id;
};
Fragment Notes¶
A Fragment is a flat array consisting of a FragmentHeader and data from Readout. The format of this data should be able to be inferred from the fragment_type
field._
Last git commit to the markdown source of this page:
Author: Eric Flumerfelt
Date: Wed Apr 6 13:49:38 2022 -0500
If you see a problem with the documentation on this page, please file an Issue at https://github.com/DUNE-DAQ/daqdataformats/issues