Busy Box and related: Difference between revisions
No edit summary |
No edit summary |
||
| Line 11: | Line 11: | ||
[[Media:jalme_phd-thesis.pdf|PhD Thesis, Johan Alme]] | [[Media:jalme_phd-thesis.pdf|PhD Thesis, Johan Alme]] | ||
[[Media:bb_manual.pdf|User Guide BusyBox, Rikard Bølgen]] | |||
[[Category:Trigger]] | [[Category:Trigger]] | ||
Revision as of 19:27, 19 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 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 of these conditions is true: Buffers in Fec are full, upon receiving a trigger sequence from TTC or when the TTC sends a global reset to the Fee. The BusyBox is located in the DAQ counting rom.