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!
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!
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!
participants (2)
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Joel Jaeggli -
yifeng zhou