2–26
Chapter 2: Board Components
Components and Interfaces
Cyclone V GX FPGA Development Board
May 2013
Altera Corporation
Reference Manual
10/100/1000 Ethernet
The development board supports 10/100/1000 base-T Ethernet using an external
Marvell 88E1111 PHY and Altera Triple-Speed Ethernet MegaCore MAC function. The
PHY-to-MAC interface employs a RGMII interface. The MAC function must be
provided in the FPGA for typical networking applications.
The Marvell 88E1111 PHY uses 2.5-V and 1.0-V power rails and requires a 25-MHz
reference clock driven from a dedicated oscillator. The PHY interfaces to a RJ45 model
with internal magnetics that can be used for driving copper lines with Ethernet traffic.
Figure 2–7
shows the RGMII interface between the FPGA (MAC) and Marvell 88E1111
PHY.
Table 2–23
lists the Ethernet PHY interface pin assignments.
A25
PCIE_TX_P2
AB4
1.5-V PCML
Transmit bus
A26
PCIE_TX_N2
AB3
1.5-V PCML
Transmit bus
A29
PCIE_TX_P3
Y4
1.5-V PCML
Transmit bus
A30
PCIE_TX_N3
Y3
1.5-V PCML
Transmit bus
B11
PCIE_WAKEn
Y27
2.5-V
Wake signal
Table 2–22. PCI Express Pin Assignments, Schematic Signal Names, and Functions
Board
Reference (J19)
Schematic Signal Name
Cyclone V GX
Pin Number
I/O Standard
Description
Figure 2–7. RGMII Interface between FPGA (MAC) and Marvell 88E1111 PHY
10/100/1000 Mbps
Ethernet MAC
Marvell 88E1111
PHY
Device
Transformer
RJ45
RGMII Interface
TXD[3:0]
RXD[3:0]
CAT 5 UTP:
- 10BASE-T
- 100BASE-TX
- 1000BASE-T
Table 2–23. Ethernet PHY Pin Assignments, Signal Names and Functions (Part 1 of 2)
Board
Reference (U10)
Schematic Signal Name
Cyclone V GX
Pin Number
I/O Standard
Description
8
ENET_GTX_CLK
U9
2.5-V CMOS
125-MHz RGMII transmit clock
23
ENET_INTN
B17
2.5-V CMOS
Management bus interrupt
60
ENET_LED_DUPLEX
—
2.5-V CMOS
Duplex or collision LED. Not used
70
ENET_LED_DUPLEX
—
2.5-V CMOS
Duplex or collision LED. Not used
76
ENET_LED_LINK10
—
2.5-V CMOS
10-Mb link LED
74
ENET_LED_LINK100
—
2.5-V CMOS
100-Mb link LED
73
ENET_LED_LINK1000
—
2.5-V CMOS
1000-Mb link LED
58
ENET_LED_RX
—
2.5-V CMOS
RX data active LED
69
ENET_LED_RX
—
2.5-V CMOS
RX data active LED
68
ENET_LED_TX
—
2.5-V CMOS
TX data active LED
25
ENET_MDC
C17
2.5-V CMOS
Management bus data clock