Thanks Joel. Now i can understand :) 2011/3/29 Joel Jaeggli <joe...@bogus.com>
> 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! > > > >
