Busy Box and related: Difference between revisions
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== 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:
- Buffers in Fec are full
- Upon receiving a trigger sequence from TTC
- 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.