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## Project description
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GEFE is an FMC carrier card featuring a Proasic3 FPGA, a GBTx chip,
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radiation hard power supply, a VTRx and an FMC connector. This card is
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meant to be a generic carrier for application specific FMC-HPC
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mezzanines and provides access to communication via the GBT
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communication link.
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Other FMC projects and the FMC standard are described in [FMC
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Projects](https://www.ohwr.org/project/fmc-projects).
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The **GBT-based Expandable Front-End (GEFE)** is a multipurpose
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FPGA-based radiation tolerant card. It is foreseen to be the new
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standard FMC carrier for digital front-end applications in the CERN
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BE-BI group. Its intended use ranges from fast data acquisition systems
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to slow control installed close to the beamlines, in a radioactive
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environment exposed to total ionizing doses of up to 600 Gy. The GEFE
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takes advantage of the Giga Bit Transceiver (GBT)/Versatile Link
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platform developed by the CERN PH-ESE group. This provides a radiation
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hard, high-speed (4.8Gbps), bidirectional, optical link for
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communication with back-end electronics, and multiple low-speed
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(40@80MHz, 20@160MHz or 10@320MHz) electrical links (e-links) for
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communication with digital front-end electronics. The link can be fixed
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and deterministic in clock phase and data latency if required. In
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addition to the high-speed optical link, the GEFE features a custom
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Electrical Serial Link Transceiver (ESLT) to be used in low-speed
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communications over copper cable through long distances (tested up to
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2km). In order to maximize the versatility, the GEFE is expanded with
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dedicated front-end cards through a High-Pin Count FPGA Mezzanine Card
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(FMC HPC) connector which features up to 160 user-specific I/Os (that
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can be configured both as single-ended or differential pairs) as well as
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4 differential clock inputs and 2 differential bidirectional clocks. The
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high-speed lines (DP) of the FMC HPC connector are used as user-specific
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I/Os and can also be used for special functions (this configuration does
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not comply with the FMC standard). In addition to the FMC HPC connector,
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the GEFE offers 2 general purpose low-pin count connectors. Both present
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the same form-factor, though one of them feature 13 noise shielded
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user-specific I/Os (where 8 of these I/Os may be directly connected to
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the FMC HPC), whilst the other connector features 24 user-specific I/Os.
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The interface between the e-links and the digital front-end electronics
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connected to the FMC HPC and/or the two general purpose connectors, as
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well as the control of the different on-board resources (e.g. LEDs,
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etc.) is carried out by a Microsemi ProAsic3, a flash-based FPGA that
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has been qualified for operating in radioactive environments. All other
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components are also qualified for use in high radiation environments.
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The use of an FPGA, coupled with flexible powering and clocking schemes,
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provides the capability to adapt the GEFE for interfacing to the user’s
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systems. Moreover, the variety of optical and electrical interfaces on
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the board, coupled with its flexible architecture, mean that it can
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easily be adapted for use in many different applications where radiation
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tolerance is a requirement.
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*TEMPLATE TO BE FILLED
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IN**
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