LAN9500AI datasheet(77/213 Pages) MICROCHIP

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DS00001875A-page 77

LAN950x

The Auto-MDIX function can be disabled through the Special Control/Status Indications Register, or the external

AUTOMDIX_EN configuration strap.

5.6.8

PHY POWER-DOWN MODES

There are 2 power-down modes for the PHY as discussed in the following sections.

5.6.8.1

General Power-Down

This power-down is controlled by register 0, bit 11. In this mode the PHY, except the management interface, is powered-

down and stays in that condition as long as PHY register bit 0.11 is HIGH. When bit 0.11 is cleared, the PHY powers up

and is automatically reset. Please refer to Section 7.5.1, "Basic Control Register," on page 175 for additional information

on this register.

Note:

When operating in 10BASE-T or 100BASE-TX manual modes, the Auto-MDIX crossover time can be

extended via the Extend Manual 10/100 Auto-MDIX Crossover Time bit of the EDPD NLP / Crossover Time

Configuration Register. Refer to Section 7.5.8, "EDPD NLP / Crossover Time Configuration Register," on

page 182 for additional information.

FIGURE 5-19:

DIRECT CABLE CONNECTION VS. CROSS-OVER CABLE CONNECTION.

Note:

For maximum power savings, auto-negotiation should be disabled before enabling the General Power-

Down mode.

TXP

TXN

RXP

Not Used

RXN

Not Used

TXP

TXN

RXP

Not Used

RXN

Not Used

Direct Connect Cable

RJ-45 8-pin straight-through

for 10BASE-T/100BASE-TX

signaling

TXP

TXN

RXP

Not Used

RXN

Not Used

TXP

TXN

RXP

Not Used

RXN

Not Used

Cross-Over Cable

RJ-45 8-pin cross-over for

10BASE-T/100BASE-TX

signaling

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