Busy Box and related
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.
Version history
1.0
- Magne Munkejord
1.01 (~may 2009)
- Firmware version register added to 0x2015
- Busy Controller module updated to handle orphan messages
Download Section
Specification document:
user_guide_busybox.pdf
Source files:
SVN database
BusyBox firmware:
- Version 1.01: | busybox_fpga1.bit | busybox_fpga2.bit | busybox_fpga1_solo.bit
DCS board firmware for BusyBox:
DCS BusyBox firmware
RCU Trigger Receiver Module Master Thesis, Magne Munkejord PhD Thesis, Johan Alme User Guide BusyBox, Rikard Bølgen