LAN7430 datasheet(34/77 Pages) MICROCHIP

Part #	LAN7430

Description	Low Power PCIe to Gigabit Ethernet Controller with Integrated Ethernet MAC / PHY

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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34 / 77 page

LAN7430/LAN7431

DS00002631D-page 34

 2018-2019 Microchip Technology Inc.

• The 125MHz clock is provided from an external clock source.

• The LAN7431 can output a 25MHz reference Clock that can be converted for generating the RGMII TXC Signal.

Table 6-1 describes the RGMII signals. Refer to the RGMII Version 2.0 Specification for more detailed information.

The LAN7431 RGMII pin connections to a MAC are detailed in Figure 6-1.

TABLE 6-1:

RGMII SIGNAL DEFINITION

RGMII Signal

Name

Pin Type

(with respect to LAN7431)

Pin Type

(with respect to MAC)

Description

TXC

Output

Input

Transmit Reference Clock

(125MHz for 1000Mbps, 25MHz for 100

Mbps, 2.5MHz for 10 Mbps)

TX_CTL

Output

Input

Transmit Control

TXD[3:0]

Output

Input

Transmit Data [3:0]

RXC

Input

Output

Receive Reference Clock

(125MHz for 1000Mbps, 25MHz for 100

Mbps, 2.5MHz for 10 Mbps)

RX_CTL

Input

Output

Receive Control

RXD[3:0]

Input

Output

Receive Data [3:0]

FIGURE 6-1:

RGMII SIGNAL DIAGRAM

TXC

TX_CTL

TD[3:0]

RXC

RX_CTL

RXD[3:0]

ETH Ref CLK

LAN7431 MAC Interface

MAC Interface

TXC

TX_CTL

TXD[3:0]

RXC

RX_CTL

RXD[3:0]

CLK125

RGMII

OSC

125MHz

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