The Linux-based single board computer for front end crates in the DZERO Data Acquisition System

Author

Angstadt, R. ; Brooijmans, G. ; Chapin, D. ; Clements, M. ; Cutts, D. ; Fuess, S. ; Haas, A. ; Hauser, R. ; Johnson, M. ; Kulyavtsev, A. ; Mulders, M. ; Padley, P. ; Petravick, D. ; Rechemacher, R. ; Snyder, S. ; Watts, G.

Author_Institution

Fermi Nat. Accel. Lab., USA

Volume

2

fYear

2003

fDate

19-25 Oct. 2003

Firstpage

1303

Abstract

The Level 3 Trigger/Data Acquisition system (L3DAQ) for the DZERO detector was redesigned from scratch for the Fermilab Tevatron´s RunII. The L3DAQ moves data at a rate of 250 MB/sec from 63 readout crates to one of 82 Level 3 Trigger farm nodes over Ethernet. The readout crates are VME based, and each consists of a number of detector specific digitizer cards and a controller. The readout crates also contain a single L3DAQ Single Board Computer (SBC). Crate data size per event ranges from several kilobytes up to 24 kilobytes for the largest; and the data must he collected from each of the VME cards at an event readout rate of 1 kHz. The SBC, a VMIC 7750, is an off-the-shelf component and runs Linux with several common and custom patches. This paper will describe the custom driver we´ve written to control the VME readout, modifications to the Linux kernel, and the user level readout code.

Keywords

data acquisition; local area networks; nuclear electronics; operating systems (computers); trigger circuits; DZERO Data Acquisition System; Ethernet; Linux-based single board computer; Trigger farm nodes; front end crates; Data acquisition; Detectors; Ethernet networks; Helium; Kernel; Laboratories; Linux; Proton accelerators; Routing; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2003 IEEE

ISSN

1082-3654

Print_ISBN

0-7803-8257-9

Type

conf

DOI

10.1109/NSSMIC.2003.1351933

Filename

1351933