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## Nikhef and Vrije Universiteit Amsterdam
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### Xilinx Family-7 GTH (Nikhef)
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VHDL sources are available for a deterministic PHY for the Xilinx
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Family-7 GTH (used by some Virtex-7 devices).
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### Rabbit\_FX: White Rabbit Oscillators on an FMC mezzanine (Nikhef)
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A White Rabbit FMC module that includes the DACs and Oscillators needed
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to run White Rabbit has been built
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(https://redmine.nikhef.nl/et/project/rabbit_fx/wiki). It enables code
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development on a vendor FPGA development board before new hardware is
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available.
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### White Rabbit Switch mini backplane for embedded applications. (Nikhef)
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In embedded detector electronics there is usually not much space
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available. Work is in progress to create a small WR Switch mini
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backplane with two 2x5 SFP cages.
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### Calibration (Nikhef, Vrije Universiteit Amsterdam):
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Calibration of WR gear is addressed by the following three main items:
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1\) Absolute delay calibration
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It is proven that hardware delay calibration parameters can be derived
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(https://www.ohwr.org/project/wr-calibration/wiki). These parameters
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define the timing relationship between measurable external phase planes
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(i.e. the PPS connector and SFP electrical connector). Additional "mode
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abscal" still needs to be added to PPSi.
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2\) Electrical/Optical and Optical/Electrical calibration
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Although still in a laboratory state, it has been proven that hardware
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delay calibration parameters of electrical/optical and
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optical/electrical converters (i.e. SFPs in most cases) can be measured
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with pico-second precision. Storing the delay parameters in SFP EEPROM
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will enable exchange of SFPs without the need for re-calibration. A
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definition for storing calibration parameters can be found here:
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https://www.ohwr.org/project/sfp-plus-i2c/wikis/User_EEPROM.
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3\) In-situ asymmetry coefficient determination
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Work is in progress to determine the fiber asymmetry coefficient in-situ
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using SFPs with a tunable laser.
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Tools for calibration have been developed.
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a) It is planned to produce a batch of "SFP+ Loop Back Modules"
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(https://www.ohwr.org/project/white-rabbit/uploads/f6d07a9f48cfbaf3846f0b9b985571e4/SFP__timing_calibration_module.pdf)
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used for absolute calibration. Currently the mechanical housing causes
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some issues that prevent us from production. When these issues are
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solved an announcement will follow via the white-rabbit-dev mailing list
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such that people interested can sign up for a module.
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b) A 10 Gbps capable Multi SFP crate is designed including "SaFariPark"
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software (https://www.ohwr.org/project/sfp-plus-i2c/wiki) which
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enables us to exercise SFP modules, both with respect to their serial
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link, as well as the I2C interface. The latter is needed for accessing
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digital diagnostics, storing calibration parameters and enabling SFP
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tuning. Moreover "SaFariPark" computes SFP checksums and can correct
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SFPs with corrupted EEPROM content (unfortunately something we
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experienced too often).
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c) A proposal for a generic software library to access SFPs via the I2C
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bus is launched (https://www.ohwr.org/project/libsfp/wiki). When this
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software is deployed in WR gear then calibration
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parameters stored in EEPROM are accessible, as well as reading out SFP
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Digital Diagnostics.
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## EPFL
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