NXP Semiconductors QorIQ T2080 - Ethernet Management Interface

RGMII
MDIO/MDC
ETH. Cntr. 1
T2080
EMII
RGMII
RGMII
MDIO/MDC
RTL8211E_VB
Transformer
Transformer
RJ-45 Port
RJ-45 Port
ETH. Cntr. 2
EMII
RGMII
RTL8211E_VB
Figure 10. EC1/EC2 interface connectivity
2.8 Ethernet Management Interface
The T2080 has two Ethernet Management Interfaces (EMI), both powered by LVDD. However, EMI2 is only used with XFI-based
PHYs, which uses 1.2 V pull-up. EMI1 is used with all other non-XFI-based PHYs, including the onboard RGMII PHYs. The image
below shows the EMI hardware block.
1V2
2V5
EMI1_MDC
EMI1_MDIO
RTL8211E-VB
(RGMII PHY)
RTL8211E-VB
(RGMII PHY)
CS4315
10G CDR
AQR113C
10G-BASET
PHY_ADDR=0x01
PHY_ADDR=0x02
PHY1_ADDR=0x0C
PHY2_ADDR=0x0D
PHY1_ADDR=0x00
PHY2_ADDR=0x08
EMI1_MDC
EMI1_MDIO
T2080
EMI2_MDC
EMI2_MDIO
AQR113C
10G-BASET
Figure 11. EMI hardware block
NXP Semiconductors
Architecture
QorIQ T2080 Reference Design Board (T2080RDB-PC) User Guide, Rev. 1, 08/2021
User Guide 17 / 44