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https://github.com/slaclab/lcls-timing-core/blob/release-lcls2/LCLS-II/core/rtl/TimingPkg.vhd (this link is bad. use link below instead.)

https://github.com/slaclab/lcls-timing-core/blob/4de46d35c3536879b0fb4deff6a70b241a0a67e0/LCLS-II/core/rtl/TimingPkg.vhd

strobe : sl; -- which clock cycle it is valid
valid : sl; --
message : TimingMessageType; -- for lcls-II
stream : TimingStreamType; -- for lcls-I (eventcodes in this record)
v1 : LclsV1TimingDataType;
v2 : LclsV2TimingDataType;
modesel : sl; -- LCLS-II selected -- tells us the mode, another register sets it

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