Pin Constraints File (.pcf)¶
This file is in a different usage than the Pin Constraints File in XML format (see details in Pin Constraints File (.xml))
The PCF file is the file which users should craft to assign their I/O constraints
An example of the file is shown as follows.
set_io a pad_fpga_io set_io b pad_fpga_io set_io c pad_fpga_io
- set_io <net> <pin>¶
Assign a net (defined as an input or output in users’ HDL design) to a specific pin of an FPGA device (typically a packaged chip).
The net should be single-bit and match the port declaration of the top-module in users’ HDL design
FPGA devices have different pin names, depending their naming rules. Please contact your vendor about details.