1. PXD ATCA DAQ for DESY Test
S. Lange (Universität Gießen)
Belle PXD and SVD Workshop Göttingen,

2. DESY Test Setup „GDL“ (?) PXD DATA Copper SVD DATA FTSW
Trigger IN
2 optical links
6 Gbps
ROIs #1 (RJ45)
KONTRON
Switch
DHH #1
RJ45
LVDS >>>
JTAG <<<
DHH #2
ATCA backplane ROI broadcast
RJ45
ROIs #2 (RJ45)
GbE to MicroBlaze
PEDESTAL UPLOAD
siTCP (RJ45)
PXD
DATA
Beam
FastRECO (basf2,
root histos)
EVB #1
(SVD only)
EVB #2
(SVD + PXD)
HLT
FTB
Copper
SVD
DATA
online track finder in basf2
4 optical links 2 Gbps

3. DESY Test – Baseline Assumptions
4 GeV e−
~ 100 Hz trigger rate
magnet serves as target 5-10 secondary tracks hit detectors
„normal“ operation assume 10 tracks x 2 DHH x 2 hits/cluster x 4 bytes x 100 Hz 16 kB per 1 second > ~3 days before memory filled up
full frames operation 2 HalfLadders x 768 x 250 x 1 byte = 384 kB > 104 events can be taken before memory filled up
Track Finder for straight tracks maybe sufficient B field is solenoid B=1.2 T
field on = helix tracks, almost straight for L'10 cm
field off = straight tracks

4. DESY Test – what we plan for ATCA DAQ
2 DHH, but only 1 optical link input to ATCA
one 2-slot ATCA shelf
only one CN, maybe only use 1 FPGA
1 PC (ATCA shelf manager)
FPGA firmware:
AURORA input on optical link (RocketIO) from DHH
buffer management
unpacking/decoding and ROI filter (on or off)
siTCP output to EVB
Simple visulization („hit display“) will be available „on ATCA“, but - if hit display is running, events are not sent to EVB - monitoring on FastRECO should be default solution (but then hit display is off) - Note: ATCA DAQ is sending data out in exactly binary format as received it needs a data unpacker/decoder in basf2 on FastRECO (routines from David available)

5. DESY Test – Questions from DAQ side
NSM running ?
EPICS running ?
ROIs from HLT ? i.e. online tracking on HLT ? (CA ?)
Which binary format ? Hit based (DHP format) or cluster based (DCE format)
How many EVB nodes? Fixed IPs?
Trigger input to DHH from FTSW ? May require some NIM logic (input to FTSW) ?
double triggers ignored ?
No MIMOSA readout (decided in Bad Aibling)
DATCON input protocol is Belle2link, output protocol is Aurora