LXT9782 datasheet(29/78 Pages) INTEL

29 / 78 page

Fast Ethernet 10/100 Multi-Port Transceiver with Serial MII — LXT9762/9782

Datasheet

2.5.1.3

Controlling Auto-Negotiation

When auto-negotiation is controlled by software, the following steps are recommended:

• After power-up, power-down, or reset, the power-down recovery time, as specified in Table 34

on page 62, must be exhausted before proceeding.

• Set the auto-negotiation advertisement register bits.

• Enable auto-negotiation (set MDIO bit 0.12 = 1).

Do not enable Auto-Negotiation if fiber mode is selected.

2.5.2

Parallel Detection

In parallel with auto-negotiation, the LXT97x2 also monitors for 10 Mbps Normal Link Pulses

(NLP) or 100 Mbps Idle symbols. If either is detected, the device automatically reverts to the

corresponding operating mode.

Parallel detection allows the LXT97x2 to communicate with

devices that do not support auto-negotiation.

2.6

Serial MII Operation

The LXT97x2 exchanges transmit and receive data with the controller via the Serial MII (SMII).

The SMII performs the following functions:

• Conveys complete MII information between a 10/100 PHY and MAC with two pins per port.

Figure 12. Link Establishment Process

Check Value

0.12

Start

Done

Enable

Auto-Neg/Parallel Detection

Go To Forced

Settings

Attempt Auto-

Negotiation

Listen for 10T

Link Pulses

Listen for 100TX

Idle Symbols

Link Set

YES

Power-Up, Reset,

Link Failure

Disable

Auto-Negotiation

0.12 = 0

0.12 = 1

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