11-th CBM Collaboration Meeting. GSI Darmstadt Feb. 26-29, 2008 11-th CBM Collaboration Meeting. GSI Darmstadt Feb. 26-29, 2008 1 A New Data Acquisition System A New Data Acquisition System based on based on Asynchronous Technique Asynchronous Technique Yu. Bocharov, A. Gumenyuk, A. Klyuev, Yu. Bocharov, A. Gumenyuk, A. Klyuev, A. Simakov A. Simakov
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Yu. Bocharov , A. Gumenyuk , A. Klyuev , A. Simakov
A New Data Acquisition System based on Asynchronous Technique. Yu. Bocharov , A. Gumenyuk , A. Klyuev , A. Simakov. Objectives. To compare architectures Analog FIFO per channel vs. Dig.FIFO per ADC - PowerPoint PPT Presentation
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To compare architecturesTo compare architecturesAnalog FIFO per channel vs. Dig.FIFO per ADC Analog FIFO per channel vs. Dig.FIFO per ADC
To estimate a data loss for systems based on To estimate a data loss for systems based on architectures compared by a Monte Carlo architectures compared by a Monte Carlo modelingmodeling
To define the ADC specificationsTo define the ADC specifications
The control unit writes a channel number and a time stamp into a Dual-port Memory/FIFO. Any type of arbiter may be used to prevent conflicts of writing
When the conversion is finished a control unit initializes PD and corresponding MEM content and connects ADC to the next channel or switches it to a shutdown state if FIFO is empty
Arbitration logic Area Estimation Arbitration logic Area Estimation (Encounter, Faraday standard cells, UMC 0.18)(Encounter, Faraday standard cells, UMC 0.18)
Total of hits per cycle Total of hits per cycle probability (%) forprobability (%) for128 (a), 64 (b), 32 (c) 128 (a), 64 (b), 32 (c) channel systemchannel systemat 5% channel occupancy at 5% channel occupancy for Poisson processfor Poisson processMean – 6.4, 3.2, 1.6 Mean – 6.4, 3.2, 1.6
CBM-XYTER data loss as a function of total ADC-channels throughput CBM-XYTER data loss as a function of total ADC-channels throughput at the best (1) and worse (2) – numerical simulationat the best (1) and worse (2) – numerical simulation
λ – Poisson distribution parameter,M – number of channels per ADC,θ – channel occupancy,μ – max number of channels may be A-D converted within one cycle
Analytical estimation of a data loss for a new readout systemAnalytical estimation of a data loss for a new readout system
Data loss of a new readout system as function of ADC throughputData loss of a new readout system as function of ADC throughput @ 32 (1), 64(2), 128(3) channels per ADC – analytical and numerical @ 32 (1), 64(2), 128(3) channels per ADC – analytical and numerical