DS explanation for modified ip_stratixiv_phy_xaui_soft.qip.

libraries/technology/ip_stratixiv/phy_xaui/readme.txt

+
+
+1) ip_stratixiv_phy_xaui_soft.qip
+
+The soft XAUI qip that is generated by the MegaWizard includes the following assignment:
+
+set_global_assignment -library "lib_phy_xaui" -name SYSTEMVERILOG_FILE [file join $::quartus(qip_path) phy_xaui/altera_xcvr_xaui.sv]
+
+...which assigns a file that is exactly the same as a file in the HARD xaui QIP, which causes ambiguity in Quartus. Therefore the assignment
+has been stripped from the soft XAUI qip. The resulting QIP has been put in this dir and is read by Quartus instead of the generated QIP.
+