global trigger environment

Global Trigger

Claudia-Elisabeth WulzAnton Taurok

Annual Trigger ReviewCERN, 1 October 2000

C.-E. Wulz, A. Taurok Annual Review, Sept. 2000

Global Trigger Environment


Global Trigger Overview

PSB Input synchronizationGTL Logic calculationFDL L1A decisionTIM TimingGTFE Readout


Global Trigger Crate


Pipelined synchronizing buffer PSB


PSB 6 channel prototype


Algorithm Logic

Particle Condition for 2 back-to-back isolated electrons

Particle Condition for 2 back-to-back isolated opposite-sign muons with MIP bits set

Initial step: Particle and Delta ConditionsThe first are applied to a group of objects. The conditions are: ET or pT thresholds, /-windows, bit patterns for isolation, quality, charge, and spatial correlations (, ) between objects of the same type. Delta Conditions calculate spatial correlations between different objects.


Algorithm Logic

Next step: Actual algorithm calculations.Logical combinations (AND-OR) of objects are determined.


Functional Diagram of Algorithm Logic


Global Trigger Logic board GTL9U


Setup- and Placement Program generating VHDL code for the Condition chips

Wiring of input channels for 6U prototype boards


Setup- and Placement Program

Event Generator


Condition to find 2 isolated electrons/photons with spatial correlation

<== Setup file


Final Decision Logic board FDL


GT+GMT LATENCY


Status of Global Trigger September 2000• Custom backplane and PSB input prototype exist.

• GTL-prototype: 4 , 4x4 calorimeter channels– New structure of the prototype similar as on the final 9U board

• uniform structure, smaller latency, flexibility, but design more complicated

• Condition Chips : Each receives two thirds of the input channels

– Conditions, Spatial conditions, Pre-Algorithms, Algorithms

• Algo Chips: Algorithms

– VHDL design ==> fixed VHDL code

• Predefined Templates, Condition types, I/O-pins

– Setup and Placement Software ==> variable VHDL code• Wiring of Input Channels and of algorithm bits to output pins

• Definition of Conditions //Condition types as building blocks.

• Definition of Algorithm AND-OR logic // product terms, inversion

– aim for ===>Automated Chip design

– Event Generator Software

– Board layout: Placement, connectors....


Status of Global Trigger September 2000

• FDL board: Definition of functions ongoing

• TCS board: Partitioning; definition of functions

• JTAG software from JTAG Technology– infrastructure, interconnection, cluster tests done

– problems with programming of FPGAs by JTAG

– PSB module tested: 25% of connections can be tested

• BGA Solder station for Fine Line BGA (1mm grid) chips– 256, 484 pins...ok;

– 672 pins...Tests to find optimal solder parameters


Schedule 2001

• GTL-prototype: – VHDL design finished and prototype board produced

– delay Nov 2000 ==> Jan 2001

– Software for Design and Tests until March 2001...

• FDL board: – Functions defined and top-down design done until Nov 2000.

– FPGA chips designed and FDL board built until Nov 2001.

• GMT : Conceptual design until Nov 2000– define and simulate final algorithms

• JTAG software and tests: available until Dec 00...already working


Milestones 1999, 2000-2004• D431 - June 1999

• PSB_6U prototype production Status: Board tested.

• BACK6U design Status: done

• D432 – Nov 1999 milestone changed• BACK6U production Status: Board in use.

• D433 - June 2000• GTL_6U design Status: Delay due to redesign

• D434 – Nov 2000 Trigger Logic Functions tested• GTL_6U tested; Status: Delay

• FDL_9U design

• Combined logic test: Backplane + PSB + GTL

• Conceptual GlobalMuon Trigger design

• D435 - Nov 2001 Complete Logic Pipeline tested• Combined Prototype test: Backplane + PSB + GTL+FDL

• D436 - June 2003 24-channel Global Trigger available

• D437- Nov 2003 Global Muon Trigger available

• D438 - Nov 2004 32-channel Global Trigger available

global trigger environment

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