DFE : DFE2
The DFE2 board was designed to replace the
aging DFE motherboards and "double-wide" daughterboards. The DFE2
boards are built around a single medium sized FPGA which is used to
implement the physics algorithms. A smaller "helper" FPGA implements
the DFE backplane interface logic and connects to other devices
such as the front panel LEDs, temperature sensor, serial number device
and flash memory. The DFE2 boards are designed to be used in legacy
DFE crates (e.g. low voltage power distribution, transition boards,
etc.).
The DFE2 boards may be used as a replacement for the following legacy
DFE board types: CTOC, CTTT, CTQD, STOV, STSX, DFEF, FPSS, and FPTT.
The DFE2 boards are not firmware compatible with the legacy DFE
boards; firmware designs must be recompiled for the new FPGA. The
DFE2 boards are not compatible with the DFEA2 boards which use a
completely different crate and backplane design.
DFE2 boards are identified by a unique 48-bit serial number which
may be read remotely from the backplane registers.
The helper FPGA firmware is generic and is common to all DFE2 board instances in the CTT system. The Helper firmware archive is here.
The flavour of the DFE2 board is determined exclusively by the Main FPGA firmware design.