Status of the CSC Track Status of the CSC Track-Finder-Finderacosta/cms/tridas_may00.pdf · Status...

D. Acosta, University of Florida TriDAS Review May 2000 1

Status of the CSC Track-FinderStatus of the CSC TrackStatus of the CSC Track--FinderFinder

Darin Acosta

University of FloridaMay 2000


OutlineOutlineOutline

Overview of the CSC trigger systemSector ReceiverSector ProcessorMuon SorterCSC/DT Interface


Strip FE cards

Wire FE cards

Port Card

PC

Sector Receiver

Sector Processor

OPTICAL

SR SP

CSC Track-Finder

CSC Muon Sorter

Global µ Trigger

DTRPC

FE

FE

Global L1

2µ / chamber

3µ / port card

3µ / sector

4µ

4µ

4µ4µ

LCT

Strip LCT + Motherboard card

Wire LCT card

On chamber In peripheral crate

In counting

house

TMB

LCT

RPC Interface Module

RIM

CSC Muon Trigger SchemeCSC Muon Trigger SchemeCSC Muon Trigger Scheme


OPTICAL

SP

1 Muon Sorter

3µ / port card

3µ / sector

ME1

ME2-ME3

ME4

SR

DT TF

SP

From CSC Port Cards

MS

MB1

PC

From DT Track-Finder

24 Sector Receivers (+12 for ME4)

12 Sector Processors

To Global Muon Trigger

GMT

RPC

4µ

4µ

8µ

The CSC Track-FinderThe CSC TrackThe CSC Track --FinderFinder

12 sectors

(UCLA) (Florida) (Rice)

(Vienna)

(Vienna)

From DT Track-Finder

3.1.1.2 3.1.1.3,3.1.1.4

3.1.1.153.1.1.1WBS:


Sector Receiver FunctionalitySector Receiver FunctionalitySector Receiver Functionality

1. Receive 6 µ segments via 12 optical links from 2 Muon Port Cards• Require 3 Sector Receivers for one 60°

sector2. Synchronize the data3. Reformat the data into track segment

variables• LCT bit pattern → η, ϕ, ϕb, ...

4. Apply corrections for alignment5. Communicate to Sector Processor via

custom backplane (Channel Link)6. Fan out ME1/3 µ segments to DT Track-

Finder

} via LUTs

UC

LA

3.1.1.2


Sector Receiver LogicSector Receiver LogicSector Receiver Logic

UC

LA

JTAG interface

Controller FPGA

Front Panel

Optical Receiver

Optical Fiber from MPC

Deserializer

Optical Receiver

Optical Fiber from MPC

Deserializer

Front FPGA

LUTS

LUTS

Back FPGA

To Barrel

To Backplane

VME

Repeat for each Muon

3.1.1.2


Sector Receiver LUT SchemeSector Receiver LUT SchemeSector Receiver LUT Scheme

UC

LA


Sector ReceiverSector ReceiverSector Receiver

• Fell behind schedule after postdoc departure.

• Personnel added in December/January:• Robert Cousins, physicist, 50% time• Vladislav Sedov, electronics engineer, 90% time

(10% residual work on ALCT board)• Also using paid consultant for some FPGA work

(UCLA CS Ph.D. candidate)

• Schematics now well underway.

• Long-lead-time parts ordered.

• Layout planned by beginning of May.

• Plan to be ready for summer Track Finder test.

UC

LA

3.1.1.2


Sector Processor FunctionalitySector Processor FunctionalitySector Processor Functionality

1. Accumulate track segments for possibly more than one B.X.

2. Extrapolate in 3D from one station to another for all possible track segment combinations

3. Assemble tracks from extrapolation results4. Select best 3 tracks and cancel ghosts5. Assign track parameters: p T, ϕ, η, quality

New since last Review:

• Combined DT/CSC overlap region onto same boardas CSC-only region (add MB1–ME2 extrap.)

• Improved P T assignment technique

• Ghost-busting when 2 muons enter 1 CSC chamber (try all combinations)

1 2

1

2

Flor

ida

3.1.1.3, 3.1.1.4


To Front panel

EU1-2

EU1-3

EU2-3

EU2-4

EU3-4

EU MB1-2

TAU1

TAU2

TAU3

FSUBXA

FIFO MUX

AU

FromBackplane

Bunch Crossing Analyzer

Track Assembler Units

Final Selection Unit

Extrapolation Units

Assignment Unit

busbus

Sector Processor LogicSector Processor LogicSector Processor Logic

Flor

ida

3.1.1.3, 3.1.1.4


Extrapolation LogicExtrapolation LogicExtrapolation Logic

L U T η 1

L U T η 2

L U T ∆ η

SU B η A -η B

“ A N D ”

η (A 1)

A m b(A 1)

A m b(B 1)

“ O R ”

η (B 1)

L U T φ b

-

L U T φ b

+

“ A N D ” SU B φ A -φ B

φ (A 1) φ (B 1)

φ b (A 1)

φ b (B 1)

C M P ∆ φ -φ b

+

L U T φ b

+

L U T φ b

-

C M P ∆ φ -φ b

-

C M P ∆ φ -φ b

+

C M P ∆ φ -φ b

-

L U T ∆ φ h igh

L U T ∆ φ m ed

L U T ∆ φ lo w

C M P ∆ φ h igh

C M P ∆ φ m ed

C M P ∆ φ lo w

A B S ∆ φ

Q ual(A 1)

Q ual(B 1)

L U T E xtra p Q ual

Q η(A 1B 1) Q η(A 2B 1) Q η(A 3B 1)

Q extrap(A 1B 1)

η road finder

ϕ road finder

quality assignm ent un it

L U T ∆ φ

z

ϕ

η road finder

ϕ road finder

quality assignment unit

Flor

ida


Track Selection and PT Assignment

Track Selection and Track Selection and PPTT AssignmentAssignment

SUBφ1-φ2

SUBφ2-φ3

LUTφ

LUT η

MUXFIFO

MUX

φ1

φ2

φ3

Mode(From FSU)

φ

η

~2M x 8SRAMLUT

Rank (PT & Quality)

Sign

φ

η

I.D.Comparison

Unit

Track Rank Sorter

MUX

Cancellation Logic and Encoder

9 Track Assembler RAMs

“9 to 3” Sorter with ghost cancellation logic

New: 3-station sagitta measurement using FPGA preprocessing and RAM

(Improves P T resolution from 30% to 20%)

Flor

ida


SP Prototype LayoutSP Prototype LayoutSP Prototype Layout

Bunch Crossing Analyzer

Extrapolation Units

Track Assembler Units

Final Selection Unit

Assignment Units

VME/JTAG interface (developed separately)

XCV50BG256 XCV400BG560 XCV150BG352

XCV50BG256

SRAM

SRAM

Cus

tom

Cha

nnel

Link

bac

kpla

neS

tand

ard

VM

E

• Layoutcomplete

• 12 layers

• Tests setfor 6/1/00

Flor

ida

US CMS DOE/NSF Review: April 11-13, 2000 13

Prototype Crate LayoutPrototype Crate LayoutPrototype Crate Layout

One sector is half of Track-Finder crate

SPSRSR SR CCB

Six crates for entire system

Fully routed for summer tests

Flor

ida

Smaller prototype tested already

3.1.1.7


Pre-Prototype TestsPrePre--Prototype TestsPrototype Tests

Flor

ida

VME / JTAG interface for SR and SP:

Software & hardware for FPGA and SRAM downloading through VME works

Channel Link backplane and connector tests:

No errors found up to 58 MHz clock (400 MHz on backplane)


Muon Sorter FunctionalityMuon Sorter FunctionalityMuon Sorter Functionality

1. Receive 36 muons from 12 Sector Processors• 36 × 18 bits = 648 bits (& control bits)

2. Sort and rank the best 4 muons• Sort is based on 7 bits (5 bits for pT and 2 bits

for quality)3. Send the output to the Global Muon Trigger for

association with RPC and DT triggers• 4 × 22 bits = 88 bits

Ric

e

New since last Review:

• Reduction in muon count from 72 to 36 (inclusion of CSC/DT overlap in Sector Processor)allows sorting to be accomplished in one FPGA

3.1.1.15


FF SORTER 4 out of 18

153comparisonsin parallel

SORTER 4 out of 8


FF

FF

FF

FF

FF

28

28

28

28

28

28

28

2814

28

7+6

ALTERA EP20K200EFC484-1

10 2 3 4“4 out of 36” SINGLE-CHIP SORTER BLOCK DIAGRAM AND TIMING

FF

FF

FF

28

28

28

28

28 28

7+6

LUT

ADR1

PAT1

LUT

LUT

LUT

ADR2

ADR3

ADR4

PAT2

PAT3

PAT4

SORTER 4 out of 18


14

FF

FF

FF

FF

6

6

6

6

7

7

7

7 8

8

8

8

CLK

28

7+6

7+6

7+6

7+6

7+6

7+6

40MHz

6

6

6

6

VME INTERFACE FOR LUT READ/WRITE

28

FF- FLIP-FLOP, LUT - LOOK-UP TABLE RAM

Muon Sorter LogicMuon Sorter LogicMuon Sorter Logic Ric

e

3.1.1.15


VMEINTERFACE

VME J1CONNECTOR

SORTERPLD

CONNECTORTO CUSTOM BACKPLANE

252

56

9U * 400 MM BOARD

CCB INTERFACE

CONNECTORSTO GMT

CONNECTOR TORECEIVER BOARDS

GMT LVDSDRIVERS

Sorter Board Block DiagramSorter Board Block DiagramSorter Board Block Diagram Ric

e

3.1.1.15


CONNECTORSTO GMT

12 CONNECTORS TORECEIVER BOARDS

S R R R R

Muon Sorter Crate LayoutMuon Sorter Crate LayoutMuon Sorter Crate Layout Ric

e

3.1.1.15


CONNECTOR TO SP

CONNECTOR TO SP

Rx

PIPELINEPLD

10K130Eor

20K200E

Rx

CONNECTOR TOSORTER BOARD

CONNECTOR TO SP

RECEIVERS

Rx

21

2121

2760

60

6084

CLOCK

POWER

Sorter Receiver Board Block Diagram

Sorter Receiver Board Sorter Receiver Board Block DiagramBlock Diagram R

ice

3.1.1.15


Summer PlansSummer PlansSummer Plans

Crate test with prototype SR, SP, CCB (and TMB, MPC) scheduled for summer 2000

• Bench tests start June 1• Integration tests start July 1• Will test optical link connections and trigger algorithms

at 40 MHz, verify output and latency

All designs are proceeding well, and we should be able to make milestone

• Conceptual design, schematics, and some layouts already exist

Development of test software started


Separation of DT/CSC CoverageSeparation of DT/CSC CoverageSeparation of DT/CSC Coverage

• Hard boundary defined η=1.04

• Separate Track-Finders optimized for each system

• Information shared across boundary for maximum efficiency

• Tentative agreement reached on DT/CSC interface Feb’00

Slow simulation of CMS detector in GEANT 3.21

0

100

200

300

400

500

600

700

800

0 200 400 600 800 1000 1200Z (cm)

R (

cm)

η = 1.04

ME1/3

MB2/1


Advantages of ProposalAdvantages of ProposalAdvantages of Proposal

• Interconnections are cut in half when track segments from ME 2/2 and MB 2/2 are not shared(only ME 1/3 and MB2/1 are shared)

• The mapping of 60° CSC trigger sectors onto 30° DT ones is avoided (no ME 2/2)• But, ME1 station has 30° or 20° subsectors, so there

may still be a mapping problem

• The RPC data may be used by the GMT to settle any ghosting problem if a single muon is found by both Track-Finders

• φb and η do not need to be sent by the CSC Track-Finder for DT T-F extrapolations


Advantages ContinuedAdvantages ContinuedAdvantages Continued

• The DT Track-Finder may trigger on MB1-MB2 type tracks • These track segments and all those sent by

the CSC trigger are assumed to be in barrel region

• The CSC Track-Finder logic is considerably simplified with proposed boundary• Already assumed in present prototype


Issues with ProposalIssues with ProposalIssues with Proposal

Must demonstrate acceptable efficiency by simulation

CSC Sector Receiver must be designed to send only 2 track segments (out of 3) for the barrel-overlap region

Status of the CSC Track Status of the CSC Track-Finder-Finderacosta/cms/tridas_may00.pdf · Status...

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