Re: XGMII interface

[yifeng zhou <zhuifeng0426 () gmail com>]

Thanks Joel. Now i can understand :)

2011/3/29 Joel Jaeggli <joelja () 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!