Open the downloaded constraints file in a text editor, then create an empty file with the same base name and the *.mspc extension (replacing the ".xdc"). For more information on constraints files, read: What is a Constraints File.įor Digilent boards, you can find the xdc file specific to your board on the bottom right hand side of the board's resource center, or on this page. You can also think of this file like the name definitions for physical pins, so later, in your "code" you only have to use the name, not the pin number. The xdc file is called a constraints file (standing for Xilinx Design Constraints) and contains the location constraints assigning physical FPGA chip pins to port names in HDL code. These two are an ***.xdc** and a ***.mspc** file. Multisim needs two configuration files specific to the chosen FPGA board. While Multisim contains a few selectable FPGA boards, most of them are older and were already replaced, but newer FPGA board can be easily added. However, by using the PLD design function of Multisim Desktop Education and the compiler of the Vivado Design Suite, "schematics" of digital circuits can be translated to FPGA bit files and uploaded to the chip. While using FPGAs in certain projects might be the best choice, the fact that FPGA designs have to be written in VHDL, or Verilog, might discourage new users.
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