4.2. 10GBASE-R and 10GBASE-KR
10GBASE-R is a specific physical layer implementation of the 10 Gigabit Ethernet link defined in clause 49 of the IEEE 802.3-2008 specification. The 10GBASE-R PHY uses the XGMII interface to connect to the IEEE802.3 media access control (MAC) and reconciliation sublayer (RS). The IEEE 802.3-2008 specification requires each 10GBASE-R link to support a 10 Gbps data rate at the XGMII interface and a 10.3125 Gbps serial line rate with 64B/66B encoding.
The IEEE 802.3ap-2007 specification also requires each backplane link to support multi-data rates of 1Gbps and 10 Gbps speeds. 10GBASE-KR and 1000BASE-KX is the electrical backplane physical layer implementation for the 10 Gigabit and 1 Gigabit Ethernet link defined in clause 72 and clause 70 respectively of the IEEE 802.3ap-2007 specification. The 10 Gbps backplane ethernet 10GBASE-KR implementation uses the XGMII interface to connect to the reconciliation sublayer (RS) with 64B/66B PCS encoding, the optional Forward Error Correction (FEC), and Auto-Negotiation (AN) support to the Highest Common Denominator (HCD) technology with the partner link. The optional FEC, LT, and AN logic is implemented in the core fabric. The 1Gbps backplane ethernet 1000BASE-KX implementation uses the GMII interface to connect to the reconciliation sublayer (RS) with 8B/10B PCS encoding and Auto-Negotiation support to the HCD technology with the partner link.
An additional license is required in order to use the 1G/10GbE and 10GBASE-KR PHY IP Core which also supports 10GBASE-R and 1000BASE-X links and auto-negotiation between the 10 Gigabit and 1 Gigabit Ethernet data rates.
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