QSGMII Product Guide v3.1 - 3.1 English - The Quad Serial Gigabit Media Independent Interface (QSGMII) core provides a flexible solution for combining four Serial Gigabit Media Independent Interfaces (SGMII) into a single 5 Gb/s Interface, to significantly reduce the number of Input Outputs (I/Os). This core supports Cisco QSGMII specification Version 1.2 (EDCS-540123).