= M-Stream Waveform Digitizer Raw Data Format =

== Version 1 ==

=== Subtype 0 User Payload ===

Contains a mask of channels being read out in current event, used for zero suppression.

||<-32 rowclass="bits">M-Stream Subtype 0||
||<:>word #||<:>byte offset||<:>bits||<:>description||
||<:>0-1||<:>0||<:-2>M-Stream Header||
||<:>2-5||<:>8||<:-2>Subtype 0 Event Header||
||<:>6||<:>24||31:0||readout channels 31:0 bit mask||
||<:>7||<:>28||31:0||readout channels 63:32 bit mask||

=== Subtype 1 User Payload ===

||<-32 rowclass="bits">M-Stream Subtype 1, Waveform Digitizer, first fragment||
||<:>word #||<:>byte offset||<:>bits||<:>description||
||<:>0-1||<:>0||<:-2>M-Stream Header||
||<:>2-3||<:>8||<:-2>Subtype 1 Event Header||
||<:>4||<:>16||31:0||Waveform timestamp (high bits)||
||<:>5||<:>20||31:0||Waveform timestamp (low bits)||
||<:>6||<:>24||31:0||<|3>Waveform data, two 16-bit samples per word||
||<:-3>...||
||<:>N-1||<:>4*(N-1)||31:0||

||<-32 rowclass="bits">M-Stream Subtype 1, Waveform Digitizer, next fragments||
||<:>word #||<:>byte offset||<:>bits||<:>description||
||<:>0-1||<:>0||<:-2>M-Stream Header||
||<:>2||<:>8||31:0||<|3>Waveform data, two 16-bit samples per word||
||<:-3>...||
||<:>N-1||<:>4*(N-1)||31:0||

Waveform timestamp frequency = 1600 MHz

== Version 2 ==

=== Subtype 0 User Payload ===

Contains a mask of channels being read out in current event, used for zero suppression.

||<-32 rowclass="bits">M-Stream Subtype 0||
||<:>word #||<:>byte offset||<:>bits||<:>description||
||<:>0||<:>0||31:0||Event timestamp, TAI seconds||
||<:|2>1||<:|2>8||31:2||Event timestamp, TAI nanoseconds||
||1:0||Event timestamp, TAI flags||
||<:>2||<:>16||31:0||readout channels 31:0 bit mask||
||<:>3||<:>24||31:0||readout channels 63:32 bit mask||

=== Subtype 1 User Payload ===

||<-32 rowclass="bits">M-Stream Subtype 1, Waveform Digitizer, first fragment||
||<:>word #||<:>byte offset||<:>bits||<:>description||
||<:>0||<:>0||31:0||Event timestamp, TAI seconds||
||<:|2>1||<:|2>8||31:2||Event timestamp, TAI nanoseconds||
||1:0||Event timestamp, TAI flags||
||<:|2>2||<:|2>16||31:16||Waveform data, Sample #0||
||15:0||Waveform data, Sample #1||
||<:-4>...||
||<:>N-1||<:>4*(N-1)||15:0||Waveform data, Last sample||

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[[CategoryMStream|MStream]] [[CategoryRawData|RawData]]