LAN8820 datasheet(25/83 Pages) MICROCHIP

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DS00001871B-page 25

LAN8820/LAN8820I

3.8.1.2.1

Configuring the SMI Address (CONFIG[1:0])

The SMI address may be configured via hardware to any value between 0 and 7. If an address greater than 7 is required,

the user can configure the PHY address using Software Configuration via the PHYADD[4:0] field of the 10/100 Special

Modes Register (after SMI communication at an address is established).

The CONFIG1 pin is used to configure both the SMI address and the value of the Pause Operation (PAUSE) bit in the

Auto Negotiation Advertisement Register. The user must first determine the desired PAUSE value. The configuration

pin values for CONFIG1 and CONFIG0 should then be selected using Table 3-6 (PAUSE=0) or Table 3-7 (PAUSE=1),

respectively.

Note:

The HPD pin is also a dedicated configuration pin. HPD forces the entire device to power down except for

the management interface. The Hardware Power-Down mode is described in Section 3.7.3, "Hardware

Power-Down," on page 23.

TABLE 3-6:

SMI ADDRESS CONFIGURATION WITH PAUSE=0

PHYADD[2:0]

CONFIG1

CONFIG0

000

CPV(0)

001

CPV(0)

CPV(1)

010

CPV(0)

CPV(2)

011

CPV(0)

CPV(3)

100

CPV(1)

CPV(0)

101

CPV(1)

110

CPV(1)

CPV(2)

111

CPV(1)

CPV(3)

TABLE 3-7:

SMI ADDRESS CONFIGURATION WITH PAUSE=1

PHYADD[2:0]

CONFIG1

CONFIG0

000

CPV(2)

CPV(0)

001

CPV(2)

CPV(1)

010

CPV(2)

011

CPV(2)

CPV(3)

100

CPV(3)

CPV(0)

101

CPV(3)

CPV(1)

110

CPV(3)

CPV(2)

111

CPV(3)

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