ots::UDPFragment::Header Struct Reference

#include <artdaq-ots/Overlays/UDPFragment.hh>

Public Types
typedef uint32_t	data_t
typedef uint32_t	event_size_t
typedef uint32_t	data_type_t

Public Attributes
event_size_t	event_size: 28
event_size_t	type: 4

Static Public Attributes
static size_t const	size_words = 1ul
	Units of Header::data_t.

Detailed Description

The "Header" struct contains "metadata" specific to the fragment which is not hardware-related

Header::data_t – not to be confused with Metadata::data_t ! – describes the standard size of a data type not just for the header data, but ALSO the physics data beyond it; the size of the header in units of Header::data_t is given by "size_words", and the size of the fragment beyond the header in units of Header::data_t is given by "event_size"

Notice only the first 28 bits of the first 32-bit unsigned integer in the Header is used to hold the event_size ; this means that you can't represent a fragment larger than 2**28 units of data_t, or 1,073,741,824 bytes

Definition at line 60 of file UDPFragment.hh.

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The documentation for this struct was generated from the following file:

• otsdaq/artdaq-ots/Overlays/UDPFragment.hh