Why are IBIS models not generated for the PCI IO standard by the Intel® Quartus® II design software when the current strength is set to a minimum?

Description

IBIS models are not generated for the PCI I/O standard in Quartus® II if a minimum current strength assignment has been applied, as the PCI I/O standards do not support current strength control.

A warning of the form given below will be observed during IBIS file generation if a minimum current strength assignment has been made:

Warning: IBIS model for pin "pci_<pin name>" at package pin <pin location> is not available

Resolution

To work around this issue, remove any current strength assignments made to PCI I/O standard pins and re-compile the design.