check your xgmii specs... it's ddr so there is a bit on both clock rise and fall.
http://en.wikipedia.org/wiki/10_Gigabit_Media_Independent_Interface On 3/29/11 5:27 AM, yifeng zhou wrote: > Dears: > > As in IEEE 802.3 clause 46, in 10G Ethernet, RS and PCS may use XGMII > interface to inter-connect. > > XGMII interface is a 32-bit wide, transmit & receive data path, working on > frequency of 156.25HZ. So, for transmit direction, the total transmit rate > should be 32*156.25=5Gbps, how 10G works with this interface? > > Further, on PMA, the transmit rate become 312.5M characters per lane.. how > done this number come? > > thanks! >
