Speaker
Mei Ye
Description
This article describes the simulation of the read-out subsystem
which will be subject to the BESIII data acquisition system.
According to the purpose of the BESIII, the event rate will be about
4000Hz, and the data rate up to 50Mbytes/sec after Level 1 trigger.
The read-out subsystem consists of some read-out crates and read-out
computer whose principle function is to collect event data from the
front-end electronics after Level 1 trigger, to transfer data
fragments from each VME read-out crate to online computer farm
through two levers of computer pre-processing and high speed network
transmission. The read-out implementation is based on commercial
single board computer MVME5100 running VxWorks operating system.
The article outlines the structure of the simulative platform
which included hardware components and software components. It puts
emphasis on the framework of the read-out subsystem, data process
flow and test method.
Especially, it enumerates key technologies in the process of design
and analyses of the test result. In addition, results which
summaries the performance of the single board computer from the
data transferring aspects will be presented.
Key word: BESIII read-out subsystem MVME5100 VxWorks VMEbus DMA
read-out computer
