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## Project description
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*The GBT-based Expandable Front-End (GEFE) is a multipurpose FPGA-based
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radiation tolerant card.** It is foreseen to be the new standard FMC
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carrier for digital front-end applications in the CERN BE-BI group. Its
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intended use ranges from fast data acquisition systems to slow control
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installed close to the beamlines, in a radioactive environment exposed
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to total ionizing doses of up to 750 Gy.
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\*The Giga Bit Transceiver based Expandable Front-End (GEFE) is a
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multi-purpose FPGA-based radiation tolerant card, produced under the
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CERN Open Hardware License (CERN OHL). 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 (equivalent to what the VFC-HD is for the back-end
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applications). Its intended use ranges from fast data acquisition
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systems to slow control installed close to the beamlines, in a
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radioactive environment exposed to Total Ionizing Doses (TID) of up to
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750 Gy.
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The GEFE takes advantage of the Giga Bit Transceiver (GBT)/Versatile
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Link platform developed by the CERN PH-ESE group. This provides a
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radiation 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).
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Link developed by the CERN PH-ESE group. This provides a rad-hard,
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high-speed (4.8 Gbps), bidirectional, optical link (named Versatile
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Link) for communication with back-end electronics, and multiple
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low-speed (40 at 80 MHz, 20 at 160 MHz or 10 at 320MHz) electrical links
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(named e-links) for communication with digital front-end electronics.
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The communication through the GBT/Versatile Link can be fixed and
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deterministic in clock phase and data latency if required. In addition
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to the GBT/Versatile Link, the GEFE features a custom Electrical Serial
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Link Transceiver (ESLT), to be used in low-speed communications over
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copper cable through long distances (tested up to 2 km at 10 Mbps).
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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 26-pin connectors, one of them
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featuring 13 noise shielded user-specific I/Os (where 8 of these I/Os
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may be directly connected to the FMC HPC), whilst the other connector
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featuring 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
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dedicated mezzanine cards through a High-Pin Count FPGA Mezzanine Card
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(FMC HPC) connector. This feature gives users the possibility of having
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an application specific digital or mixed-signal system, for interfacing
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with front-end electronics. For instance, the GEFE could be expanded
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with an ADC mezzanine card for sampling the analogue signals from a beam
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position monitor (BPM), or with a mezzanine card featuring a connector
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for plugging the GEFE onto the backplane of a crate.
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The use of an FPGA, coupled with flexible powering, clocking and FPGA
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programming schemes, provides the capability to adapt the GEFE for
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interfacing to the user\`s systems. Moreover, the variety of optical and
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electrical interfaces on the board, in addition to its flexible
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architecture, mean that it can easily be adapted for use in many
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different applications where radiation tolerance is a
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requirement.
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![](/uploads/81481e3cc4cbc51354839bc667b51e07/gefe_v1_3d_perspective.png)
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... | ... | @@ -91,9 +84,9 @@ view](https://www.ohwr.org/project/gefe/uploads/d9b35c7295270d1d5f020e5cd0bd2928 |
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- Official design data [EDMS
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EDA-03168-V1](https://edms.cern.ch/nav/EDA-03168)
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- [GEFE Specifications](https://www.ohwr.org/project/gefe/wikis/Documents/GEFE-Specifications-(v2.0.0))
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- Other documents:https://www.ohwr.org/project/gefe/wikis/documents
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- [Other documents](https://www.ohwr.org/project/gefe/wikis/documents)
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### Users
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### GEFE Community
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- CERN BE-BI-QP:
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- New Multi-Orbit POsition System SPS (MOPOS SPS): Requested 300
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... | ... | @@ -104,9 +97,10 @@ view](https://www.ohwr.org/project/gefe/uploads/d9b35c7295270d1d5f020e5cd0bd2928 |
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- Motor Controller Optical Interface (MCOI): Requested 25 pieces
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- CERN BE-BI-BL:
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- Beam Wire Scanners: Interested
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- Beam Gas Ionization (BGI) Monitor
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- CERN BE-CO:
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- CLIC Acquisition and Control Module (CLIC-ACM): Interested
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- New WorldFIP devkit: Interested
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- New Rad-tol fieldbus devkit: Interested
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- CERN TE-EPC:
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- Function Generator Controller Lite (FGClite): Interested
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- CERN EN-STI:
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... | ... | @@ -120,38 +114,17 @@ view](https://www.ohwr.org/project/gefe/uploads/d9b35c7295270d1d5f020e5cd0bd2928 |
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## Status
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<table>
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<tbody>
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<tr class="odd">
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<td><strong>Date</strong></td>
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<td><b> Event </b></td>
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</tr>
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<tr class="even">
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<td>12-2014</td>
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<td>First ideas about the project.</td>
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</tr>
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<tr class="odd">
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<td>02-2015</td>
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<td>Inclusion of project on OHWR.</td>
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</tr>
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<tr class="even">
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<td>03-2015</td>
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<td>Start of schematics design.</td>
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</tr>
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<tr class="odd">
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<td>19-06-2015</td>
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<td>First version of PCB layout.</td>
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</tr>
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<tr class="even">
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<td>03-07-2015</td>
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<td>Design review comments received.</td>
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</tr>
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<tr class="odd">
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<td>29-07-2015</td>
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<td>Order sent to CERN TS-DEM for fabrication of two GEFE v1 prototypes.</td>
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</tr>
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</tbody>
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</table>
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| **Date**| \* Event \*|
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| 12-2014 | First ideas about the project. |
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| 02-2015 | Inclusion of project on OHWR. |
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| 03-2015 | Start of schematics design. |
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| 19-06-2015 | First version of PCB layout. |
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| 03-07-2015 | Design review comments received. |
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| 29-07-2015 | Order sent to CERN TS-DEM for fabrication of two GEFE v1
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prototypes. |
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| 30-09-2015 | Fabrication of the two GEFE v1 prototypes finished. |
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| 03-12-2-15 | GEFE v1 prototypes test results presentation at CERN
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BE-BI Technical Board
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-----
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