BCM53112 Datasheet includes below no. of SGMII ports.
4× 100FX/1000FX SGMII ports.2× 1G/2.5G SGMII+ ports.
But these SGMII+ ports are mentioned as XFI interfaces.
can we use XFI interface as SGMII ??
Yes, it supports XFI interface as SGMII for 2.5GE and 1GE speed.
Will come back to you for further queries !!