Constraint files bind logical ports to package pins and define clocks, I/O standards and timing assumptions.
A constraint file is part of the hardware design, not a convenience file. Before using any XDC, SDC, QSF, CST, PCF or LPF file, confirm board revision, connector voltage, clock source and bank voltage from official documents or a trusted board repository.
Compact Gowin GW2AR board with HDMI, audio amplifier, TF card slot, SDRAM, and onboard debugger.
Gowin Semiconductor GW2AR20,736 LUTopen toolchain28.17 USD
Open-source educational Lattice iCE40UP5K board designed around the Yosys, nextpnr and IceStorm flow.
Lattice Semiconductor iCE40 UltraPlus5,280 LUTopen toolchainprice at the seller
Digilent Artix-7 board with Vivado WebPACK support, Pmods, Arduino/chipKIT style expansion, DDR3 and Ethernet.
AMD/Xilinx Artix-7open toolchainprice at the seller
