Busy Box and related: Difference between revisions

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[[Category:Alice|Trigger]]
== Overview ==
== 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.
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:  
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:
# Buffers in Fec are full
# Buffers in Fec are full
# Upon receiving a trigger sequence from TTC
# Upon receiving a trigger sequence from TTC
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[[Media:bb_manual.pdf|User Guide BusyBox, Rikard Bølgen]]
[[Media:bb_manual.pdf|User Guide BusyBox, Rikard Bølgen]]


[[Category:Alice]]
[[Category:Trigger]]
[[Category:Trigger]]

Revision as of 09:12, 24 February 2009

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.

Download Section

RCU Trigger Receiver Module

Master Thesis, Magne Munkejord

PhD Thesis, Johan Alme

User Guide BusyBox, Rikard Bølgen