ALT_IOBUF Primitive

The ALT_IOBUF primitive allows you to do the following:

  • Make a location assignment
  • Make an I/O standards Definition assignment
  • Make a drive strength (current strength) assignment
  • Make a slow slew rate assignment
  • Enable bus-hold circuitry
  • Enable a weak pull-up resistor
  • Make an on-chip termination (OCT) assignment to a bidirectional pin from a lower-level entity

This primitive is available for supported device (Cyclone® III and Stratix® III) families.

  • Trying to set other parameters not listed in the Parameters table on the ALT_IOBUF primitive results in errors.
  • For information about Intel® Quartus® Prime primitive instantiation, go to Using a Intel® Quartus® Prime Logic Function.