[139192] in North American Network Operators' Group
Re: XGMII interface
daemon@ATHENA.MIT.EDU (Joel Jaeggli)
Tue Mar 29 08:36:55 2011
Date: Tue, 29 Mar 2011 05:36:09 -0700
From: Joel Jaeggli <joelja@bogus.com>
To: yifeng zhou <zhuifeng0426@gmail.com>
In-Reply-To: <AANLkTimt_QPh2y2o0053+MciJeYt2CnZ6B8RGKUtp=Ek@mail.gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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!
>
