Compact Muon Solenoid

Thomas ThemelTU WienJune 2009

Institut für Hochenergiephysik, ÖAW

Control of the Global Muon Trigger

Tobias NoebauerIvan MikulecMarc Magrans de AbrilChristian HartlThomas ThemelGregor Kasieczka

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• GMT takes 16 input muons, reduces to 4 “best” sorted muons to send to GT

• GMT hardware is not static– FPGA firmware implements functions– Registers in firmware to change

configuration– LUTs used to implement constant-time

functions

Recapitulation from yesterday

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GMT Configuration

• GMT is configured from central cell with a subsystem key

• Configuration details are fetched from database

• Implements standardized configuration operation as required by central cell

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GMT Configuration DB

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Configuration Panel

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LUT Generation

• Functions defined by C++ functions in GMT emulator.

• GMT emulator runs in offline software framework CMSSW (later)

• Need to launch from within TS to generate lookup tables for loading to in hardware.

• Additional parameters from GMT_SOFTWARE_CONFIG table

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Parameters Panel

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Monitoring Panel

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Test Panel

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Pattern Testing

• Load inputs into simulation memories• Capture output in spy memories• Compare expected outputs to emulator

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Run Settings Panel

• Deal with small configuration variations that would require too many keys while still keeping provenance information.

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References and Documentation

GMT TWiki page:

https://twiki.cern.ch/twiki/bin/view/CMS/GlobalMuonTrigger

System Integration of the Global Muon Trigger for the CMS Experiment at CERN

Tobias Nöbauer, Diplomarbeit, Technische Universität Wien, Oct. 2007http://cms.cern.ch/iCMS/jsp/openfile.jsp?type=TS&year=2008&files=TS2008_004.pdf

CVS:http://isscvs.cern.ch/cgi-bin/cvsweb.cgi/TriDAS/trigger/gmt/ts/cell?cvsroot=tridas