Intel® Quartus® Prime Pro Edition User Guide: Design Optimization

ID 683641
Date 10/02/2023

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2.2.1. Initial I/O Assignment Guidelines

The I/O standard and drive strength requirements that you specify for your design affect the I/O timing. Follow these guidelines when specifying initial I/O assignments:
  • When specifying I/O assignments, specify an accurate I/O timing delay for timing analysis and Fitter optimizations.
  • If the PCB layout does not indicate pin locations, then leave the pin locations unconstrained. This technique allows the Compiler to search for the best layout. Otherwise, make pin assignments to constrain the compilation appropriately.