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12th May 2008 AIDA FEE Report 1
AIDA Front end electronicsReport May 2008
•Progress•Data compression•Plan for prototype delivery
12th May 2008 AIDA FEE Report 2
Progress• Investigating Buffer and FADC PCB layout• Checking detector connection board routing.• Specification for utility interface - Metronome• Power supply (50W) options – 12v distribution• FADC interface DDR to parallel conversion
12th May 2008 AIDA FEE Report 3
Compression
• Max data rate for FEE Gbit link 60MB/sec.• Waveforms are the major contributor to
this demand.• Compress the waveforms as they are
transferred between memories in the FPGA
12th May 2008 AIDA FEE Report 4
• Low noise
• Noisy
• Periodic
Compression for AIDA
Compared lossless methods. 8 sample data sets, 3 types.Each file 128MBytes, compressed in 2000 word “chunks”.
12th May 2008 AIDA FEE Report 5
• Several techniques looked at.
• Varying results, all data dependent.
• Home-grown method as good as others for this data.
• Knowledge of data format/structure.
Compression for AIDA
Figure 1
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Ch1 Ch2 Liv1 Liv2 Scr1 Scr2 Seg1 Seg2 Aggr
Source Data
Com
pres
sion
rice
zlib
huff
xmatch
lzrw3
scl
12th May 2008 AIDA FEE Report 6
• Minimum+Offset (MO), Data Dictionary (DD), No Compression (NC).
• MO usually best, DD best for noisy data. Sometimes NC best.
• All improved when bit-packed.
• Recommend Minimum+Offset with fallback to No Compression
Compression for AIDA
Data Characteristics (Home-Grown)
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No Detector Periodic Pulse NoisySource Data
Com
pres
sion
optimum
min packed
dict packed
min
dict
12th May 2008 AIDA FEE Report 7
Milestones for Prototype FEE delivery
• Complete Specification :– 1st July 2008 => low risk
• Complete Schematic and PCB layout : – 1st Aug 2008. => medium risk
• Deliver 6 FEE cards ( 6 weeks ) : – 15th Sept 2008 => low risk
• Complete Prototype VHDL : – 1st November 2008 => Medium
risk• Commission FEE cards :
– 1st December 2008 => High risk
• Design ASIC Mezzanine– 1st Aug 2008. => medium
risk
• Deliver 6 ASIC Mezzanines– 15th Sept 2008 => low risk
• Complete Kapton board :– 1st Nov 2008 => low risk
12th May 2008 AIDA FEE Report 8
