LAN8820I datasheet(26/83 Pages) MICROCHIP

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LAN8820/LAN8820I

DS00001871B-page 26

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3.8.1.2.2

Configuring the Mode of Operation (CONFIG[3:2])

This section describes the initial modes of operation that are available using the CONFIG[3:2] configuration pins. The

user may configure additional modes using Software Configuration when the CONFIG[3:2] options do not include the

desired mode.

The CONFIG3 pin is used to configure the values of the MOD field (19.15:11) The configuration pin values for CONFIG3

and CONFIG2 should be selected using Table 3-8. These tables also detail how the MOD field of the Extended Mode

Control/Status Register will be configured.

Section 3.8.1.2.3 describes how the MOD field controls other configuration bits in the device. When a soft reset is issued

via the PHY Soft Reset (RESET) bit of the Basic Control Register, configuration is controlled by the register bit values

and the CONFIG[3:0] pins have no affect. Likewise, changing the MOD field of the Extended Mode Control/Status Reg-

ister bits does not change the configuration of the device in this case.

3.8.1.2.3

Configuration Bits Impacted by the Mode of Operation

Immediately after a reset, the MOD field of the Extended Mode Control/Status Register will be set dependent on the

configuration pin values of the CONFIG3 and CONFIG2 pins, as described in Section 3.8.1.2.2. Table 3-9 details how

the MOD field effects other device configuration register bits.

Note:

Table 3-8 utilizes register index and bit number referencing in lieu of individual names.

TABLE 3-8:

CONFIGURING THE MODE OF OPERATION

Mode Definitions

CONFIG3

CONFIG2

Reg 19

[15:11]

All mode capable (10/100/1000). Auto-negotiation enabled.

Auto master/slave resolution single port.

CPV(2)

CPV(0)

10111

All mode capable (10/100/1000). Auto-negotiation enabled.

Auto master/slave resolution multi-port.

CPV(2)

CPV(1)

11000

All mode capable (10/100/1000). Auto-negotiation enabled.

Manual master/slave resolution slave port.

CPV(2)

11001

All mode capable (10/100/1000). Auto-negotiation enabled.

Manual master/slave resolution master port.

CPV(2)

CPV(3)

11010

Note:

Table 3-9 utilizes register index and bit number referencing in lieu of individual names

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