Blue Flower

DDL Products

RORC v.2.1

Read-out Receiver Card


RORCv2 is a standard DDL Read-Out Receiver card designed for use in the data acquisition (DAQ) system of the ALICE experiment.

However, it is a standard interface and can be used in any DAQ-s.

It recieves data from two DDL SIU cards through duplex optical cables, and writes it (with DMA) to the computer memory via PCI-X bus.


  • 2.125 Gb/s optical data transmission
  • Complies with CERN proprietary Detector Data Link (DDL)
  • 2 DDL channels with integrated full duplex 32-bit DIU interfaces
  • 206 MB/s maximum sustained bandwidth per channel
  • 412 MB/s maximum data throughput

DDL Features

  • Instant-on, (automatic link synchronization and management)
  • Supports remote control and firmware upgrades of the Front-end system
  • Bit error rate << 10-12, very high error detection rate, CRC check on data blocks


  • User replaceable Small Form Factor Pluggable (SFP) optical transceivers
  • Duplex LC optical connector
  • 100 MHz, 64-bit, 3.3V PCI-X interface
  • Compatible with: SIU, RORCv3, RORCv2