LAN9250 datasheet(233/421 Pages) MICROCHIP

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DS00001913A-page 233

LAN9250

Note 4:

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

and the speed select strap (speed_strap_1). Essentially, if the Auto-Negotiation strap is set, the default

value is 1, otherwise the default is determined by the value of the speed select strap. 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 1.

Note 5:

The default is the value of the Auto-Negotiation strap (autoneg_strap_1). Refer to Section 7.0, "Configura-

tion Straps," on page 54 for more information. In 100BASE-FX mode, the default value of this bit is a 0.

Note 6:

The default value of this bit is determined by the logical AND of the negation of the Auto-Negotiation strap

(autoneg_strap_1) and the duplex select strap (duplex_strap_1). Essentially, if the Auto-Negotiation strap

is set, the default value is 0, otherwise the default is determined by the value of the duplex select strap. Refer

to Section 7.0, "Configuration Straps," on page 54 for more information.

In 100BASE-FX mode, the Auto-Negotiation strap is not considered and the default of this bit is the value

of the duplex select strap.

Duplex Mode (PHY_DUPLEX)

This bit is used to set the duplex when the Auto-Negotiation Enable

(PHY_AN) bit is disabled.

0: Half Duplex

1: Full Duplex

R/W

Note 6

Collision Test Mode (PHY_COL_TEST)

This bit enables/disables the collision test mode of the PHY. When set, the

collision signal is active during transmission. It is recommended that this fea-

ture be used only in loopback mode.

0: Collision test mode disabled

1: Collision test mode enabled

R/W

6:0

RESERVED

Bits

Description

Type

Default

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