LXT970ATC datasheet(30/74 Pages) INTEL

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LXT970A — Dual-Speed Fast Ethernet Transceiver

Datasheet

2.4.2.1

Manual Configuration

The LXT970A can be manually configured to force operation in the following modes:

• 100FX, full-duplex

• 100FX, half-duplex

• 100TX, full-duplex

• 100TX, half-duplex

• 10T, full-duplex

• 10T, half-duplex

Refer to Table 12 through Table 14 in the Hardware Control Interface discussion for specific

manual configuration settings.

2.4.2.2

Auto-Negotiation/Parallel Detection

With auto-negotiation enabled at power-up or reset, the LXT970A attempts to establish link

operating conditions with its partner by sending Fast Link Pulse (FLP) bursts.

If the link partner is also capable of auto-negotiation, the two devices exchange FLP bursts to

communicate their capabilities to each other. Each side finds the highest common capabilities that

both sides can support and then begins operating in that mode.

If the link partner is not capable of auto-negotiation, it transmits either 10 Mbps Normal Link

Pulses (NLP) or 100 Mbps Idle symbols. When the LXT970A detects either NLPs or Idle symbols,

it automatically configures to match the detected operating speed in half-duplex mode. This ability

allows the LXT970A to communicate with devices that do not support auto-negotiation.

Figure 11. LXT970A Initialization Sequence

Power-up or Reset

Check Value

MDDIS

High

Low

MDIO Control

Mode

Exit

Manual Control

Mode

Disable MDIO Writes

Read H/W Control

Interface

Initialize MDIO Registers

Read H/W Control

Interface

Pass Control to MDIO

Interface

Update MDIO Registers

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