Specifications

Chapter 2: Board Components 2–41
Communication Ports and Interfaces
© March 2009 Altera Corporation Cyclone III 3C120 Development Board Reference Manual
Ta bl e 2–45 is an excerpt from the Marvell data sheet with a summary of RGMII
interface signals and their functions.
Ta bl e 2–46 lists the 10/100/1000 Ethernet PHY component reference and
manufacturing information.
f For more information about the data sheet and related documentation, contact
Marvell at www.marvell.com.
U5 pin 12 RGMII interface transmit data bus bit 1 2.5 V ENET_TX_D1 AA5
U5 pin 14 RGMII interface transmit data bus bit 2 2.5 V ENET_TX_D2 Y5
U5 pin 16 RGMII interface transmit data bus bit 3 2.5 V ENET_TX_D3 W3
U5 pin 9 RGMII interface transmit control 2.5 V ENET_TX_EN AA7
Table 2–44. Ethernet PHY Interface I/O (Part 2 of 2)
Board
Reference Description I/O Standard
Schematic
Signal Name
Cyclone III
Device Pin
Number
Table 2–45. RGMII Signal Definitions
Schematic
Signal Name
Marvell
Device Pin
Name
RGMII
Spec Pin
Name Description
ENET_GTX_CLK GTX_CLK TXC 125-MHz, 25-MHz, or 2.5-MHz transmit clock with ±50 ppm tolerance
based on the selected speed.
ENET_TX_EN TX_EN TX_CTL Transmit control signals. TX_EN is encoded on the rising edge of
GTX_CLK, TX_ER, XORed with TX_EN is encoded on this falling
edge of GTX_CLK.
ENET_TXD[3:0] TXD[3:0] TD[3:0] Transmit data. In 1000 base-T and 1000 base-X modes, TXD[3:0]
are presented on both edges of GTX_CLK. In 100 base-T and 10
base-T modes, TXD[3:0] are presented on the rising edge of
GTX_CLK.
ENET_RX_CLK RX_CLK RXC 125-MHz, 25-MHz, or 2.5-MHz receive clock ±50 ppm tolerance
derived from the received data stream and based on the selected
speed.
ENET_RX_DV RX_DV RX_CTL Receive control signals. RX_DV is encoded on the rising edge of
RX_CLK, RX_ER XORed with RX_DV is encoded on the falling
edge of RX_CLK.
ENET_RXD[3:0] RXD[3:0] RD[3:0] Receive data. In 1000 base-T and 1000 base-X modes, RXD[3:0]
are presented on both edges of RX_CLK. In 100 base-TX and 10
base-T modes, RXD[3:0] are presented on the rising edge of
RX_CLK.
Table 2–46. Ethernet PHY Component Reference and Manufacturing Information
Board Reference Description Manufacturer
Manufacturing
Part Number
Manufacturer
Website
U5 Ethernet PHY Base-T device Marvell Semiconductor 88E1111-B2-CAA1C000 www.marvell.com