Science Carrier PCIe Board Standalone White Rabbit by Creotech

Simple PCIe FMC Carrier – SPEC

The Simple PCIe FMC Carrier – SPEC can hold one FMC card and an SFP connector.

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KK 176_Simple PCIe FMC Carrier SPEC
KK 172_Simple PCIe FMC Carrier SPEC
KK 170_Simple PCIe FMC Carrier SPEC

On the PCIe side it has a 4-lane interface, while the FMC mezzanine slot uses a low-pin count connector. This board is optimized for cost and is usable with most of the FMC cards designed within the OHWR project (e.g. ADC cards, Fine Delay).

Technical Parameters

Programable resources

  • Xilinx Spartan6 FPGA (XC6SLX45T-3FGG484C)


  • 256MB DDR3 2Gbit (MT41J128M16HA-15E)
  • 32 MB SPI Flash for FPGA configuration (M25P32-VMF6P – EOL).


  • 1x SFP cage for fiber optic transceiver (WR support) 1.25 and 2.5Gbps
  • 2x SATA connector
  • 1x JTAG header for Xilinx programming during debugging
  • 1x Mini USB UART bridge
  • Power connector jack 5.5/2.1mm

Clocking res.

  • 1×10-280 MHz I2C Programmable XO Oscillator, starts up at 100 MHz (Silicon Labs Si570, freely usable)
  • 1x 25 MHz TCXO controlled by a DAC with SPI interface (AD5662, used by White Rabbit PTP core)
  • 1x 20 MHz VCXO controlled by a DAC with SPI interface (AD5662, used by White Rabbit PTP core)
  • 1x low-jitter frequency synthesizer (TI CDCM61004, fixed configuration, Fout=125 MHz, used by White Rabbit PTP core)

Power Supply

  • Power supply 12V,
  • Power consumption 5-12W


  • 4-lane PCIe (Gennum GN4124)
  • FMC slot with low pin count (LPC) connector
  • on-board thermometer IC (DS18B20U+)
  • unique 64-bit identifier (DS18B20U+)
  • programmable Red and Green LEDs
  • 2 buttons
  • 6-layer PCB



This PCIe Carrier has been designed to be used together with a single FMC card and an SFP connector to build various elements of accelerator control systems. Use cases include large pixel detector readout systems, acquisition of bunch-by-bunch data streams and online processing of data applications using GPUs. The SPEC has been tested with links running up to 2.5Gbps allowing multiple data streams multiplexed onto a single link. SPEC is tailored to the needs of White Rabbit time and event distribution networks and can be implemented as a simple White Rabbit node in pair with FMC DIO 5CH TTL A.


More technical information:


We offer electronics engineering consultancy services, including: custom modifications of hardware, custom firmware and gateware modifications, system design, integration and testing.

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