LS1012A SerDes spread-spectrum clock source recommendations

[MugaNathan]

In LS1012A I need to use both the PCIe & SGMII(100Mbps speed) interface simultaneously for data transfer, will this SerDes spread-spectrum clocking support both simultaneously or any one at a time.

[yipingwang]

Spread-spectrum clocking cannot be used if the same SerDes reference clock is shared with other non-spread-spectrum-supported protocols. For example, if spread-spectrum clocking is desired on a SerDes reference clock for the PCI Express protocol and the same reference clock is used for any other protocol, such as SATA or SGMII because of the SerDes lane usage mapping option, spread-spectrum clocking cannot be used at all.