We are using LX210A Processor in our design, We have connected different interfaces in the same SERDES : For Example:If we connect the PCIe on Lane 4,5, SGMII on Lane6 and SGMII on Lane 7 ,Is necessary to provide GNDS/NC in between the pins. Please suggest us the solution in detail.
LX2160 has a fixed ball map and if there are GND or NC pins in between then use them. For not used interface, refer LX2160 design checklist for guidelines.