Place and Route

This contains information related to the place and route step.

• Nextpnr models
  • Generated model files
  • bel.txt (legacy)
  • bel.v2.txt
  • bel.v3.txt (BEL timing)
    • Conditions
  • pips.txt
  • placement_estimate.txt
    • FABULOUS_LC placement estimate
• Nextpnr compilation
  • Building
  • User guide
  • Primitive instantiation
  • Constraints for the placement of IO/BELs
• Pin Constraints File (PCF)
  • How it works
  • PCF syntax
    • What the BEL letter means
  • Finding valid I/O locations
  • Running the flow
  • Worked example
  • Troubleshooting