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6678中的Gigabit Ethernet (GbE) Switch Subsystem中的refclk = LINERATE * RATESCALE/MPY的疑问

6678中的Gigabit Ethernet (GbE) Switch Subsystem中的refclk = LINERATE * RATESCALE/MPY,请问:

(1)refclk是否是serdes的参考时钟?

(2)LINERATE 一般设置为多少?

(3)在文档

KeyStone Architecture
Literature Number: SPRUGV9D
June 2013
Gigabit Ethernet (GbE) Switch Subsystem中没有找到在哪里设置RATESCALE?