München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 38: Instrumentation und Anwendungen

HK 38.4: Vortrag

Mittwoch, 22. März 2006, 17:15–17:30, H

ALICE HLT Readout Receiver Card — •Torsten Alt, Volker Lindenstruth, and Heinz Tilsner — Kirchhoff Institute for Physics, Heidelberg

The High-Level Trigger Read Out Receiver Card (H-RORC) is an FPGA based PCI card sitting inside the Front End processors of the ALICE High-Level Trigger computing farm. The main fields of application are to transfer the raw detector data into the main memory of the HLT framework and to process the data online inside the FPGA. For this purpose a PCI card has been developed based on the latest Xilinx Virtex4 FPGA. Connectivity is established by up to two optical links to the detector and a fast PCI (PCI 64/66, PCI-X 64/133) interface to the HLT. Four independent banks of DDR400 SDRAM allow storing of data or relevant information for online processing. Interconnection between RORCs is realised with two full-duplex fast serial LVDS links and can be used to send any kind of information between the RORCs. In addition to that, a Fast-Ethernet PHY can access every standard Ethernet. For configuration of the FPGA two schemes have been implemented. A simple one which can be used for prototyping, and a complex one which allows a safe remote update of the firmware via PCI. A full functional prototype was reviewed successfully and is ready for production.