Difference: AMC13UserManual (21 vs. 22)

Revision 2202 Sep 2015 - EricHazen

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META TOPICPARENT	name="HcalDTC"

THIS MANUAL IS INCOMPLETE but what is written here should be more accurate and up to date than the old "functional specification". Please e-mail me if you find mistakes/omissions here (Eric H).

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SFP transceiver with loop-back fiber from Tx to Rx must be installed in bottom site

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HCAL Orbit Gap Calibration

The AMC13 implements several features to facilitate triggers for calibration purposes during the LHC "Orbit Gap" during which no normal L1A should occur. The details of this have to a certain extent been lost in time.

See 2009 CMS Note by Jeremy et al about this. Here is a table of TTC command used by HCAL extracted from the document.

Code	Name	Source	Meaning	AMC13 Action
`00001001 (0x09)`	BCZero	BGo-1	Bunch Counter Zero (any with LSB set)	BcR
`00000100 (0x04)`	SOG	BGo-11	Start-of-Gap (QIE Reset)	-none-
`11100010 (0xe2)`	ECR	BGo-7	Event Counter reset	ECR (programmable code)
`10001000 (0x88)`	Start	BGo-9	TPG generator start	-none-
`10101000 (0xa8)`	Stop	BGo-10	TPG generator stop	-none-
`01000000 (0x40)`	Gap-Trigger	BGo-13	Laser/LED in next gap	Enable gap trigger this orbit only
`01100000 (0x60)`	Gap-Pedestal	BGo-13	Pedestal in next gap	Enable gap trigger this orbit only
`10000000 (0x80)`	Gap-Sequence-Step	BGo-13	Advance laser	Increment current laser position

Wu's Debugging Guide

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