LXT970A 데이터 시트보기 (PDF) - Intel

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LXT970A

Dual-Speed Fast Ethernet Transceiver

Intel 

Dual-Speed Fast Ethernet Transceiver — LXT970A

Controlling Auto-Negotiation

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

• After a reset or power-up (initial or from power down mode), the power down recovery time

(refer to Table 43 on page 62) must be exhausted before proceeding.

• Set MDIO Register 4 advertisement capabilities before setting MDIO bit 0.12 = 1 to enable

auto-negotiation.

Figure 12. Auto-Negotiation Operation

Power-Up, Reset,

Link Failure

Disable

Auto-Negotiation

Start

Auto

Negotiation

Enable

Auto-Neg/Parallel Detection

Go To Forced

Settings

Done

Attempt Auto-

Negotiation

Listen for 100TX

Idle Symbols

Listen for 10T

Link Pulses

YES

NO

Link Set?

2.5

2.5.1

Monitoring Operational Status

Monitoring Status via MII Registers

The Chip Status Register (Table 56 on page 72) provides a convenient indication of several status

conditions:

• Bit 20.13 is set to 1 once the link is established.

• Bits 20.11 and 20.12 indicate the link speed and duplex condition respectively.

• Bits 20.9 and 20.8 indicate the progress and status of auto-negotiation.

Refer to the Register Definition section on page 63 for additional details on specific registers.

Datasheet

31

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