FALXT972MCCA4 datasheet(52/92 Pages) INTEL

52 / 92 page

Intel

® LXT972M Single-Port 10/100 Mbps PHY Transceiver

Datasheet

Document Number: 302875-005

Revision Date: 27-Oct-2005

5.9

Monitoring Operations

5.9.1

Monitoring Auto-Negotiation

Auto-negotiation can be monitored as follows:

• Register bit 17.7 is set to ‘1’ once the auto-negotiation process is completed.

• Register bits 1.2 and 17.10 are set to ‘1’ once the link is established.

• Register bits 17.14 and 17.9 can be used to determine the link operating conditions (speed and

duplex).

Note:

When the LXT972M Transceiver detects incorrect polarity for a 10BASE-T operation, Register bit

17.5 is set to ‘1’.

5.9.2

Monitoring Next Page Exchange

The LXT972M Transceiver offers an Alternate Next Page mode to simplify the next page

exchange process. Normally, Register bit 6.1 (Page Received) remains set until read. When

Alternate Next Page mode is enabled, Register bit 6.1 is automatically cleared whenever a new

negotiation process takes place. This action prevents the user from reading an old value in bit 6.1

and assuming that Registers 5 and 8 (Partner Ability) contain valid information. Additionally, the

LXT972M Transceiver uses Register bit 6.5 to indicate when the current received page is the base

page. This information is useful for recognizing when next pages must be resent due to a new

negotiation process starting. Register bits 6.1 and 6.5 are cleared when read.

FALXT972MCCA4 数据表(PDF) 52 Page - Intel Corporation