Abstract

The readout electronics for the ALICE TPC detector consists of 4356 front-end cards (FECs) that contain the complete chain to readout the signals coming from 570132 pads. The front-end cards are grouped in 216 readout partitions, each controlled by a Readout Control Unit (RCU) that interfaces the FECs to the DAQ, the Trigger, and the Detector Control System. The RCU broadcast the trigger information to the FECs, collects the trigger related data from the FECs, assembles a sub-event, compresses the data and sends the compressed packed sub-event to the DAQ via the ALICE Detector Data Link (DDL). The RCU is designed to cope with a maximum data throughput of 200 Mbyte/s. In this paper we present an overview of the requirements, the architecture and some of the main design features of the RCU, as well as a description of two RCU prototypes.

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