Artesyn COMX-P4080-2G-ENP2 Installation and Use (August 2014) - Manual (Page 47)

Functional Description
COMX-P4080-2G-ENP2 Installation and Use (6806800P63B) 47
4.14.1 MDIO
There are totally two groups of MDIO buses in P4080. The first group is called EMI1 which
complies with IEEE 802.3 Clause 22. EMI1 has two pins: EMI1_MDC and EMI1_MDIO. It is
available externally only on dTSEC0@FMan1. EMI1 is used for the communication between
dTSEC, MAC, and PHY. SGMII PHY is also managed by EMI1.
The second group is called EMI2 which complies with IEEE 802.3ae Clause 45. EMI2 has two
pins: EMI2_MDC and EMI2_MDIO. It is available externally only on 10GEC of FMan1. EMI2
is used for the communication between 10GEC and PHY.
4.14.2 PHY
dTSEC0@FMan1
is connected to BCM5482 via RGMII. There are totally two ports included in
the GE PHY BCM5482 and only first port is used.The MDIO address for the first port is 0x01 and
the second is 0x02.
The MDIO addresses for 4 SGMII PHYs are 0x1C, 0x1D, 0x1E and 0x1F when SerDes option
#5/#6 or #10 is applied.
4.15 UART INTERFACE
COMX-P4080-2G-ENP2 consists of 4 UARTS (Tx and Rx signals for each UART) or 2 DUARTS (Tx,
Rx, CTS, RTS signals for each DUART) that are routed to the COM Express connectors. Several
optional resistors are provided to determine whether UARTS or DUARTS are routed.
When UARTS are routed, R383, R385, R387, and R389 are installed and R382, R384, R386, and
R388 are removed, and vice versa.
UART option is the default setting.