STaRBoardSTaRBoard

Jamal RorieJamal Rorie

5/09/065/09/06

Data CollectionData Collection

TDC

Leading EdgeLo Level

Discriminator MeanTimer

1:3 Splitter

ADC

Leading EdgeHi Level

Discriminator

Leading EdgeLo Level

Discriminator

TDC

1:3 Splitter

Leading EdgeHi Level

Discriminator

ADC

PMT PMT

Timing Scheme Timing Scheme

Hi level - event triggerHi level - event trigger

Lo level - higher time resolutionLo level - higher time resolution

Timing Scheme (cont.)Timing Scheme (cont.)

Current System: stretch interval between TOFFEE “T” Current System: stretch interval between TOFFEE “T” pulse rising edge and rising edge of a reference signal. pulse rising edge and rising edge of a reference signal. Measure stretched time.Measure stretched time.

New System: use HPTDC in high resolution mode to New System: use HPTDC in high resolution mode to time the rising edge from the TOFFEE “T” pulse.time the rising edge from the TOFFEE “T” pulse.– 4 TDC channels take measurements, result is interpolated.4 TDC channels take measurements, result is interpolated.– More info on high resolution mode in HPTDC Manual on pp 7-8.More info on high resolution mode in HPTDC Manual on pp 7-8.

Q Measurement Q Measurement

Current System: send directly into LeCroy 1877S, Current System: send directly into LeCroy 1877S, convert to timeconvert to time

New System: send to ADC block on STaRNew System: send to ADC block on STaR– ShaperShaper– LABRADOR3LABRADOR3

Readout SchemeReadout SchemeEvent trigger received

by STaR

Logic request to HPTDC

HPTDC polls for “hit” around requested time

HPTDC sends data,Logic queries LAB3

No HPTDC data,Logic doesn’t query LAB3

LAB3 sends data

COPPER I/O carries data downstream

Hit No Hit

COPPERCOPPER

COmmon COmmon Pipelined Pipelined Platform for Platform for Electronics Electronics ReadoutReadoutOne One standardized standardized card can card can control up to 4 control up to 4 boardsboards

STaR LayoutSTaR Layout

HPTDC

HPTDC

LAB3

LAB3

XC3S2000

COPPER

COPPER

16

16

CLK

The STaR BoardThe STaR Board

ADC BlockADC Block

LABRADOR3LABRADOR3– 12 bit data readout12 bit data readout

Shaper to elongate signalShaper to elongate signal– Originally 3 GSPSOriginally 3 GSPS– Now 100-300 MSPSNow 100-300 MSPS

ReadoutReadout

LAB3 header format under discussionLAB3 header format under discussion

TestingTesting

Shaper TestShaper Test– Elongation goodElongation good– Standard delayStandard delay

confirmingconfirming

TasksTasks

CurrentlyCurrently– Firmware developmentFirmware development

AheadAhead– Software developmentSoftware development– Firmware testingFirmware testing– FinalizationFinalization– KEK observations (mid-July)KEK observations (mid-July)

Online DocumentationOnline Documentation

http://www.phys.hawaii.edu/~jroriehttp://www.phys.hawaii.edu/~jrorie– SchematicsSchematics– UpdatesUpdates– CodeCode– DatasheetDatasheet