STAR Trigger Data Definitions

2002 Run

 

Data from the L01 crate is available at Level 1 and Level 2

Data from the L2 DSM Crates is only available at Level 2

 

L01 Crate DSMs

 

DSM Boards

#Bytes

Origin

#Bytes

Data description

Last DSM

16

CTB

2

Multiplicity (ADCs or MIPs)

CTB

2

2-bits Topology and LED info

14 bits: Unused

ZDC

2

1-bit East analog sum over low threshold

1-bit West analog sum over low threshold

1-bit East analog sum over high threshold

1-bit West analog sum over high threshold

1-bit East TAC over threshold

1-bit West TAC over threshold

1-bit East+West attenuated analog sum over threshold

9-bits TAC difference

Special Trigger

2

5-bit definition of which detector is requesting the special trigger

3-bit definition of which trigger is being requested

8 bits: Unused

BEMC and EEMC

2

Semi-defined

10 bits from BEMC

  • 2 bits from the “OR” of the incoming high tower threshold bits
  • 2 bits from the “OR” of the incoming trigger tower bits
  • 2 bits from the “OR” of the incoming ratio threshold bits
  • 2 bits from the “OR” of the incoming jet-patch threshold bits
  • 2 bits comparing the jet-patch energy sum to three thresholds

6 bits from BEMC

BBC data

2

Undefined

FPD data

2

Undefined

RHIC

2

2-bits blue and yellow ring strobes

7-bits polarization information

7 bits: Unused

Bunch Crossing

32

Internal

6

48-bit bunch crossing number

Internal

1

0:119 bunch type number

N/A

25

Unused

ZDC

16

ZDC

1

1 byte East PMT1 ADC value

ZDC

1

1 byte East PMT2 ADC value

ZDC

1

1 byte East PMT3 ADC value

ZDC

1

1 byte East analog sum: PMT1 + PMT2 + PMT3

ZDC

1

1 byte West PMT1 ADC value

ZDC

1

1 byte West PMT2 ADC value

ZDC

1

1 byte West PMT3 ADC value

ZDC

1

1 byte West analog sum: PMT1 + PMT2 + PMT3

ZDC

1

1 byte East PMT1 attenuated ADC value

ZDC

1

1 byte East attenuated analog sum: PMT1 + PMT2 + PMT3

ZDC

1

1 byte West PMT1 attenuated ADC value

ZDC

1

1 byte West PMT2 attenuated ADC value

ZDC

1

1 byte West attenuated analog sum: PMT1 + PMT2 + PMT3

ZDC

1

1 byte East+West attenuated analog sum

ZDC

1

1 byte East TAC

ZDC

1

1 byte West TAC

CPA

64

CTB - East

16

8 2-byte multiplicity measurements (ADC or MIP) each covering Dh=0.5, Df=p/2

CTB - West

16

8 2-byte multiplicity measurements (ADC or MIP) each covering Dh=0.5, Df=p/2

MWC - East

16

8 2-byte wire counts each covering Dh=0.5, Df=p/2

MWC - West

16

8 2-byte wire counts each covering Dh=0.5, Df=p/2

Quad DSM

16

CTB - East

2

2-byte multiplicity measurement (ADC or MIP) covering Dh=1, Df=2p

CTB - East

2

Topology and LED information

CTB - West

2

2-byte multiplicity measurement (ADC or MIP) covering Dh=1, Df=2p

CTB - West

2

Topology and LED information

MWC - East

2

2-byte wire count covering Dh=1, Df=2p

MWC - East

2

Unused

MWC - West

2

2-byte wire count covering Dh=1, Df=2p

MWC - West

2

Unused

EMC L2

16

BEMC

6

3 2-byte words from each of 3 Layer 1 BEMC DSMs

  • 2 bits from the “OR” of the incoming high tower threshold bits
  • 2 bits from the “OR” of the incoming trigger tower threshold bits
  • 2 bits from the “OR” of the incoming ratio threshold bits
  • 2 bits comparing the jet patch to three thresholds
  • 10 bit jet-patch energy sum

EEMC

2

1 2-byte word from 1 Layer 1 EEMC DSM

  • Undefined structure

N/A

8

Unused

BBC L2

16

N/A

N/A

Undefined

FPD L2

16

N/A

N/A

Undefined

Special Trigger

16

TCD

6

16 3-bit Special Trigger requests, one from each of 16 detectors

N/A

10

Unused

TOTAL

208

 

 

 

 

 

L2 DSM Crates

 

CTB L0

256 bytes

240 1-byte CTB slat values, either ADCs or MIPs

16 bytes - Unused

MWC L0

128 bytes

96 1-byte MWC subsector wire counts

32 bytes - Unused

BEMC L0

240 bytes

150 6-bit high tower values

150 6-bit trigger tower values

15 bytes - Unused

BEMC L1

48 bytes

18 2-byte data words from the 15 Layer 0 DSMs:

  • 2 bits comparing high tower to three thresholds
  • 2 bits comparing trigger tower to three thresholds
  • 2 bits comparing high:trigger ratio to three thresholds
  • 10 bit trigger tower energy sum

12 bytes - Unused

EEMC L0 and L1

80 bytes

40 6-bit high tower values in 4 Layer 0 DSMs

40 6-bit trigger patch values in 4 layer 0 DSMs

4 bytes unused in 4 Layer 0 DSMs

16 Undefined bytes from 1 Layer 1 DSM

BBC L1, FPD L0 and FPD L1

 80 bytes

16 1-byte BBC East inner annulus ADC values

16 1-byte BBC West inner annulus ADC values

16 1-byte BBC East inner annulus TAC values

16 1-byte BBC West inner annulus TAC values

8 1-byte BBC East outer annulus ADC values

8 1-byte BBC West outer annulus ADC values

FPD L0 – Undefined

FPD L1 - Undefined