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2.5 10/100/1000 Ethernet PHY
The UltraZed-EG SOM provides a single 10/100/1000 Ethernet port. The Zynq Ult MPSoC contains
hardened PS Gigabit Ethernet MAC (GEM) controllers. The UltraZed-EG SOM takes advantage of one of
the available PS GEM controllers to provide RGMII Ethernet signalling to the JX3 connector. The
Texas
Instruments DP83867
device is used to implement this interface. The 10/100/1000 Ethernet PHY connect
to the Zynq Ult MPSoC device through Bank 502.
The physical RJ45 connector and magnetics is not populated on the UltraZed-EG SOM. The SOM is
designed to have the physical RJ45 connector and magnetics reside on the end-user carrier card. The
RJ45 connector signals are connected to the JX3 Micro Header. The table below shows the connections
of these signals to the JX3 Micro Header.
Table 7
– 10/100/1000 Ethernet JX3 Pin Assignments
Signal Name
JX3 Pin
ETH_MD1_P
57
ETH_MD1_N
59
ETH_MD2_P
56
ETH_MD2_N
58
ETH_MD3_P
63
ETH_MD3_N
65
ETH_MD4_P
62
ETH_MD4_N
64
ETH_PHY_LED0
53
ETH_PHY_LED1
52
The next table shows the pin assignments to Bank 502 of the Zynq Ult MPSoC device for the
10/100/1000 Ethernet Port.
Table 8
– 10/100/1000 Ethernet MPSoC Pin Assignments
Ethernet PHY Signals
MPSoC Pin
MIO77_GEM3_MDIO
H19
MIO76_GEM3_MDC
H20
MIO74_GEM3_RX_D3
G20
MIO73_GEM3_RX_D2
F20
MIO72_GEM3_RX_D1
E20
MIO71_GEM3_RX_D0
E19
MIO75_GEM3_RX_CTL
F19
MIO70_GEM3_RX_CLK
C20
MIO68_GEM3_TX_D3
G18
MIO67_GEM3_TX_D2
H18
MIO66_GEM3_TX_D1
D19
MIO65_GEM3_TX_D0
A20
MIO69_GEM3_TX_CTL
B20
MIO64_GEM3_TX_CLK
F18
GEM3_RST_N
N/C
The GEM3 peripheral is used on the PS, connected through MIO [64-77] in MIO Bank 502. The Ethernet
Reset signal is active-low and connected to the I/O expander via Port 2,
P2_GEM3_RST_N
. Either of the
push button resets,
PS_POR_B
or
PS_SRST_B
will also generate the active-low Ethernet Reset signal.
The UltraZed-EG SOM also contains an active-low Ethernet PHY interrupt/power down signal that is
connected to the I/O expander via Port 3,
P3_GEM3_PWDN_N
. By default, the end-user can assert this
control signal to enable the Power Down mode of operation for the Gigabit Ethernet PHY. Alternatively, if
the pin is programmed as an interrupt output, interrupts will be asserted low to the I/O Expander. The latter