A gigabit ethernet link source card
Francis, D J, G. Drake, W.N. Haberichter, J. L. Schlereth, R. E. Blair, John W. Dawson · CERN Document Server (European Organization for Nuclear Research) · 2002
A Link Source Card (LSC) has been developed which employs Gigabit Ethernet as the physical medium.The LSC is implemented as a mezzanine card compliant with the S-Link specifications, and is intended for use in development of the Region of Interest Builder (ROIB) in the Level 2 Trigger of ATLAS.The LSC will be used to bring Region of Interest Fragments from Level 1 Trigger elements to the ROIB, and to transfer compiled Region of Interest Records to Supervisor Processors.The card uses the LSI 8101/8104 Media Access Controller (MAC) [1] and the Agilent HDMP-1636 Transceiver.An Altera 10K50A FPGA [2] is configured to provide several state machines which perform all the tasks on the card, such as formulating the Ethernet header, read/write registers in the MAC, etc.An on-card static RAM provides storage for 512K S-Link words, and a FIFO provides 4K buffering of input S-Link words.The LSC has been tested in a setup where it transfers data to a NIC in the PCI bus of a PC.