LAN9250 datasheet(239/421 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001913A-page 239

LAN9250

Note 7:

The default values of the Asymmetric Pause and Symmetric Pause bits are determined by the Manual Flow

Control Enable Strap (manual_FC_strap_1). When the Manual Flow Control Enable Strap is 0, the Symmet-

ric Pause bit defaults to 1 and the Asymmetric Pause bit defaults to the setting of the Full-Duplex Flow Con-

trol Enable Strap (FD_FC_strap_1). When the Manual Flow Control Enable Strap is 1, both bits default to 0.

Refer to Section 7.0, "Configuration Straps," on page 54 for more information. In 100BASE-FX mode, the

default value of these bits is 0.

Note 8:

The default value of this bit is determined by the logical OR of the Auto-Negotiation Enable strap

(autoneg_strap_1) with the logical AND of the negated Speed Select strap (speed_strap_1) and the Duplex

Select Strap (duplex_strap_1). Table 12-10 defines the default behavior of this bit. Refer to Section 7.0,

"Configuration Straps," on page 54 for more information. In 100BASE-FX mode, the default value of this bit

is a 0.

Note 9:

The default value of this bit is determined by the logical OR of the Auto-Negotiation strap (autoneg_strap_1)

and the negated Speed Select strap (speed_strap_1). Table 12-11 defines the default behavior of this bit.

Refer to Section 7.0, "Configuration Straps," on page 54 for more information. In 100BASE-FX mode, the

default value of this bit is a 0.

10BASE-T Half Duplex

This bit determines the advertised 10BASE-T half duplex capability.

0: 10BASE-T half duplex ability not advertised

1: 10BASE-T half duplex ability advertised

R/W

Note 9

Table 12-11

4:0

Selector Field

This field identifies the type of message being sent by Auto-Negotiation.

00001: IEEE 802.3

R/W

00001b

TABLE 12-10: 10BASE-T FULL DUPLEX ADVERTISEMENT DEFAULT VALUE

autoneg_strap_1

speed_strap_1

duplex_strap_1

Default 10BASE-T Full Duplex (Bit 6) Value

TABLE 12-11: 10BASE-T HALF DUPLEX ADVERTISEMENT BIT DEFAULT VALUE

autoneg_strap_1

speed_strap_1

Default 10BASE-T Half Duplex (Bit 5) Value

Bits

Description

Type

Default

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