Author: Doolittle, L.R.
Paper Title Page
TUBAUST02 FPGA Communications Based on Gigabit Ethernet 547
  • L.R. Doolittle, C. Serrano
    LBNL, Berkeley, California, USA
  The use of Field Programmable Gate Arrays (FPGAs) in accelerators is widespread due to their flexibility, performance, and affordability. Whether they are used for fast feedback systems, data acquisition, fast communications using custom protocols, or any other application, there is a need for the end-user and the global control software to access FPGA features using a commodity computer. The choice of communication standards that can be used to interface to a FPGA board is wide, however there is one that stands out for its maturity, basis in standards, performance, and hardware support: Gigabit Ethernet. In the context of accelerators it is desirable to have highly reliable, portable, and flexible solutions. We have therefore developed a chip- and board-independent FPGA design which implements the Gigabit Ethernet standard. Our design has been configured for use with multiple projects, supports full line-rate traffic, and communicates with any other device implementing the same well-established protocol, easily supported by any modern workstation or controls computer.  
slides icon Slides TUBAUST02 [0.909 MB]  
Large-scale Distribution of Femtosecond Timing for Accelerators  
  • J.M. Byrd, L.R. Doolittle
    LBNL, Berkeley, California, USA
  Distribution of timing signals with femtosecond relative stability has become a critical technology for linac-based free electron lasers (FELs) and linear collider accelerator complexes. The uses for this timing distribution include synchronization of diverse array of remote clients such as mode-locked laser oscillators, beam and x-ray diagnostics systems, and RF systems. I will describe recent progress in the technology of femtosecond timing distribution and locking to remote clients. I will also present concepts of how such systems are extended to multiple channels with an emphasis on applications to FELs.  
slides icon Slides WEBHMUIO05 [10.704 MB]