si data packet format

Data packet format

This page describes the data packet format for the data emitted by each silicon layer

Current format:

number of bytes	content	comment
2	packet size	Total size of packet, including this field
1	header size
2	packet flags	lowest 12 bits: whether asic data timed-out
8	packet time	nanoseconds since epoch
1	number of asics
2	asic(0) number of bytes
...	...
2	asic(N-1) number of bytes
asic(0) number of bytes	asic(0) data
...	...
asic(N-1) number of bytes	asic(N-1) data

Asic Data:

Currently we put some PL-generated info at the head of each asic data packet, followed by the data produced by the ASIC.

number of bytes	content	comment
4	event id	Generated by TM
4	event counter	Event number according to asic
4	trigger info	bits 0-11: local asic triggers. 12: TM's fast-or trigger. 13: TM trigger-ack. 14: force-trigger 15: cal-pulse
8	global counter	Time when VATA received the trigger.
8	live time	Running live-time counter for the VATA
48	asic data	This is the raw data produced by the asic