Phobos Trigger Logic

1/n

CC

TR

ER

PP*PN(N)

RP*RN(N)

TR

ER

TOF LED

Pulser

Si Cal

Pulser

Pedestal

Pulser

Sync

Event

Calibration triggers

Physics triggers

CC

LVL0 TR strobe

TOF COM

LVL0 at

300 nsec

LVL0 BUSY

UDOS

PP*PN(N)

PRE (Pileup)

Follow (TR)

FO

LVL0

VERTEX

SUM

ZCAL

D

80 nsec

20 nsec

LVL1 TR strobe

Adjust for LVL1 timing ~1000 nsec

LVL1

FAST CLEAR

Adjust for Si peaking time

GDG

11

GDG

10

GDG

15

B1

LVL1

BUSY

Start LVL2

LVL2

L2

Event counter

B2

Busy MDB

Busy Event Manager

ER = Enable Register (output), TR = Trigger Register (input), GDG = Gate and Delay Generator, FO = Fanout, 1/n = prescaler

L1

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