Busy Box and related

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Revision as of 10:54, 20 May 2009 by Rbo021 (talk | contribs)

Overview

Traditionally the Fee in ALICE sub-detectors indicates when its buffers are full and cannot handle further triggers from the CTP. This is either done directly or through the FANIN module to the LTU with a busy signal.

Due to dense cabling, four of the ALICE sub-detectors (TPC, PHOS, FMD and EMCal), utilize a BusyBox to keep track of free buffers in their Fec. The BusyBox asserts the busy signal to the LTU when one or more of these conditions are true:

  1. Buffers in Fec are full
  2. Upon receiving a trigger sequence from TTC
  3. When the TTC sends a global reset to the Fee

The busy signal is de-asserted when one or more FEC buffers are freed

The BusyBoxes are located in the DAQ counting rom.

Version history

1.0 (~april 2004)

  • Made based upon TRD DCS FW version 011.
  • Messagebuffer v1.0 (Torsten Alts orginal version)
  • Virtex driver for programming RCU FPGA included


Download Section

RCU Trigger Receiver Module

Master Thesis, Magne Munkejord

PhD Thesis, Johan Alme

User Guide BusyBox, Rikard Bølgen