The 1000BASE-X can also be implemented over LVDS Mode. Refer to the 1G/2.5G Ethernet PCS/PMA or SGMII LogiCORE IP Product Guide (PG047). In this mode, the locations tab is enabled. You have to select bitslice locations in this tab.
When using 1000BASE-X over LVDS, refer to the
1G/2.5G Ethernet PCS/PMA or SGMII LogiCORE IP Product
Guide (PG047) for port descriptions
(especially for RIU interface, dly_rdy, vtc_rdy ports)
and constraints relating to the design in the "Asynchronous 1000BASE-X/SGMII over LVDS"
section in the
1G/2.5G Ethernet PCS/PMA or SGMII LogiCORE IP Product
Guide (PG047).