CRUVI FPGA card
The CRUVI FPGA Card is a daughter card standard of Standardization Group for Embedded Technologies e.V. specifically tailored to the needs of FPGAs.
file:CRUVI Logo.png|thumb|CRUVI FPGA Card Logo
Background
The expansion bus interface is designed to create an open ecosystem of function modules for high-performance peripheral connectivity. Its main focus is on supporting FPGA and FPGA SoC devices from all major manufacturers like Altera, Lattice, Microchip and Xilinx.The word "CRUVI" is a combination of the Estonian word "KRUVI" for screw and the letter "C", which refers to the half of the hexagonal screw head. In this case, the "K" was replaced with "C" to emphasize the reference to the screw head.
Overview
It can be used to build high performance prototypes, for system integration and testing to build complex systems from smaller building blocks to iterate quickly and reduce cost. Create custom test systems for production functional testing.It´s a perfect platform for your next high-performance semiconductor evaluation boards and systems.
The carrier module supplies the power supply, the input/output voltage and controls the functions of the peripheral modules.
The CRUVI open standard coexists between low speed, low pin-count like Pmod Interface devices and high-performance, high pin-count, 400 I/O FPGA Mezzanine Card peripherals.
Three board-to-board connectors are specified: CRUVI-LS, CRUVI-HS and CRUVI-GT PCIe Gen 5.0 capable.
Bridging adapter exists to convert signals from Pmod to CRUVI-LS, from FMC to CRUVI-HS and FMC to CRUVI-GT.
History of CRUVI specification
International contributors to define the open source CRUVI specification are Trenz Electronic GmbH, Arrow Electronics, Samtec, Flinders University, Synaptic Laboratories Ltd, Symbiotic EDA and MicroFPGA UG.| Year | Version | Notes | Refs |
| 2021 | 1.0.7 -alpha | first release | |
| 2024 | 2.0.1 -alpha | new: CRUVI-GT |
The Standardization Group for Embedded Technologies e.V. launches its call for participation to establish a new Standard Development Team for the FPGA Peripheral Module standard with the working title sCRUVI. The founding meeting of the Standard Development Team for FPGA Peripheral Modules was on May 6th 2025. This initiative aims to set a groundbreaking standard for peripheral modules used in FPGA and FPGA-SoC-based systems.
Other open standards for embedded hardware and software from SGET are Smart Mobility Architecture , Qseven, embedded NUC, Universal IoT Connector UIC OPen Standard Module OSM and Open Harmonzed FPGA Module oHFM.
Structure and description of the carrier modules
Single, double or triple width modules are allowed and they have more mounting holes.A triple size of space on carrier board is 67.72 x 57.5 mm². There are 3 slots. The mounting holes for M2 screws are 2.2 mm diameter and need SMD spacer for mechanically fixing.
The CR99201 PCB template has LS and HS connectors named: AX, BY and CZ. The CR99500 PCB template has LS, HS and GT connectors.
It is recommended for all FPGA host boards with CRUVI slots provide LiteX platform support files.
Structure and description of the peripheral modules
There are different single peripheral module possible,flexible and scalable by size LS, HS and GT connectors. Mounting holes are for M2 screws 2.2 mm diameter.
CRUVI connector specification
peripheral board specification
There are different single peripheral module possible,flexible and scalable by size LS, HS and GT connectors. Mounting holes are for M2 screws
2.2 mm diameter.
It is recommended to have EEPROM with I2C for identification of peripheral module with a specific address number.
| L x H / | speed | PCB template | Note |
| 14 x 14 / 0.55 x 0.55 | LS | CR99001 | identification EEPROM is included; This template is usefull for I2C, I3C, SPI sensor, I2S PDM MEMS microphones, programmable oscillator, ADC, DAC or SPI Flash memory device in BGA24 or SO-8 package. |
| 14 x 14 / 0.55 x 0.55 | LS | CR99002 | same as CR99001 with added u.Fl connectors for I/O |
| 22 x 32 / 0.87 x 1.2598 | LS | CR99003 | maximum size one-wide half-length, identification EEPROM is included |
| 18 x 32 / 0.71 x 1.26 | LS | CR99004 | This template is usefull to convert into Pmod compatible connector. |
| 22 x 30 / 0.87 x 1.18 | LS | CR99005 | is half-length LS module with two SMA connectors |
| 18 x 20 / 0.71 x 0.79 | HS | CR99101 | minimal size HS Module; good for HyperRAM or HyperFlash, eMMC or loopback adapter for CRUVI-HS |
| 22 x 57.5 / 0.87 x 2.26 | HS | CR99102 | maximum sized single-width HS module; good for signal test adapter to probed with scope or logic analyzer, for high speed interfaces like USB-C, HDMI, MIPI CSI/DSI, SDIO, xGMII Ethernet and LVDS ADC |
| GT | CR99103 | coming soon, good for HDMI output, JESD204B ADC, loopback adapter for CRUVI-GT |