LAN8820 datasheet(19/83 Pages) MICROCHIP

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DS00001871B-page 19

LAN8820/LAN8820I

The various RGMII modes and their corresponding configuration settings are summarized in Figure 3-3.

Timing information for the RGMII interface is provided in Section 5.5, "AC Specifications," on page 65. For additional

information on the RGMII interface, refer to the RGMII specification.

FIGURE 3-3:

RGMII MODES OF OPERATION

Note:

Strapping RGMII_ID_MODE high sets the device into Hybrid Mode. In order to set the device into ID Mode,

the RGMII PHY TXC Delay Enable and RGMII PHY RXC Delay Enable bits of the Control / Status Indica-

tions Register (27.[9:8]) must be configured via software to 01b.

MAC

PCB Trace Delay

Non-ID Mode (RGMII Specification)

(27.[9:8] = 00b, RGMII_ID_MODE = 0)

TXC

RXC

PCB Trace Delay

LAN8820/

LAN8820i

TXC

RXC

ID Mode (RGMII Specification)

(27.[9:8] = 01b)

RGMII PHY TXC Delay: Disabled

RGMII PHY RXC Delay: Disabled

Hybrid Mode

(27.[9:8] = 11b, RGMII_ID_MODE = 1)

TXD[3:0]

RXD[3:0]

MAC

TXC

RXC

LAN8820/

LAN8820i

TXC

RXC

TXD[3:0]

RXD[3:0]

RGMII PHY TXC Delay: Disabled

RGMII PHY RXC Delay: Enabled

MAC

TXC

RXC

LAN8820/

LAN8820i

TXC

RXC

TXD[3:0]

RXD[3:0]

RGMII PHY TXC Delay: Enabled

RGMII PHY RXC Delay: Enabled

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