rocketio in serdes mode

Hi,
Actually i am using rocketio wizard 7.1.I want to do conversion of 8 bit
parallel data into serial stream using rocketio mgt for 3.125 gbps.
What frequency i have to apply on
refclk,rxusrclk,rxusrclk2,txusrclk,txusrclk2??
I do not want to use crc and 8b10b module of rocketio mgt.
Please suggest me any simple application for that.