Search results for "Cyclic redundancy check"

showing 3 items of 3 documents

The TileCal Optical Multiplexer Board 9U

2011

Abstract TileCal is the hadronic calorimeter of the ATLAS experiment at LHC/CERN. The system contains roughly 10,000 channels of read-out electronics, whose signals are gathered and digitized in the front-end electronics and then transmitted to the counting room through two redundant optical links. Then, the data is received in the back-end system by the Optical Multiplexer Board (OMB) 9U which performs a CRC check to the redundant data to avoid Single Event Upsets errors. A real-time decision is taken on the event-to-event basis to transmit single data to the Read-Out Drivers (RODs) for processing. Due to the low dose level expected during the first years of operations in ATLAS it was deci…

CalorimeterLarge Hadron Colliderbusiness.industryComputer scienceDetectorATLAS experimentPhysics and Astronomy(all)ATLASMultiplexerCRCData acquisitionSoftwareCyclic redundancy checkLHCElectronicsDetectors and Experimental TechniquesbusinessSingle Event UpsetsFPGAComputer hardwarePhysics Procedia
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Development of the Optical Multiplexer Board Prototype for Data Acquisition in the TileCal System

2006

This paper describes the development of the optical multiplexer board (OMB), also known as PreROD board, for the TileCal readout system in the ATLAS experiment. The aim of this board is to overcome the problems that may arise in the integrity of data due to radiation effects. The solution adopted has been to add redundancy to data transmission and so two optical fibers with the same data come out from the detector front end boards. The OMB has to decide in real time which fiber, eventually, carries data with no errors switching it to the output link connected to the read out driver (ROD) motherboard where data processing takes place. Besides, the board may be also used as a data injector fo…

Nuclear and High Energy PhysicsEngineeringMotherboardFirmwarebusiness.industrycomputer.software_genreMultiplexerFront and back endsData acquisitionNuclear Energy and EngineeringCyclic redundancy checkRedundancy (engineering)Electronic engineeringElectrical and Electronic EngineeringbusinesscomputerComputer hardwareData transmissionIEEE Transactions on Nuclear Science
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Development of the optical multiplexer board prototype for data acquisition in TileCal experiment

2005

The optical multiplexer board is one of the elements present in the read out chain of the tile calorimeter in ATLAS experiment. Due to radiation effects, two optical fibers with the same data come out from the front end boards to this board, which has to decide in real time which one carries good data and pass them to the read out driver motherboard for processing. This paper describes the design and tests of the first prototype, implemented as a 6U VME64x slave module, including both hardware and firmware aspects. In this last, algorithms for cyclic redundancy code checking are used to make the decision. Besides, the board may be used as a data injector for testing purposes of the read out…

business.industryMotherboardFirmwareComputer scienceATLAS experimentcomputer.software_genreMultiplexerFront and back endsData acquisitionEmbedded systemCyclic redundancy checkCode (cryptography)businesscomputerComputer hardware14th IEEE-NPSS Real Time Conference, 2005.
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