5220-DS02-R datasheet(64/90 Pages) BOARDCOM

64 / 90 page

BCM5220

Preliminary Data Sheet

04/20/04

Broa d c om Co rp o r a t i o n

Page 52

Auxiliary Multiple PHY Register

Document

5220-DS04-405-R

Restart Auto-Negotiation

This self-clearing bit allows the auto-negotiation process to be restarted, regardless of the current status of the state

machine. For this bit to work, auto-negotiation must be enabled. Writing a 1 to this bit restarts auto-negotiation. Since the bit

is self-clearing, it always returns a 0 when read. The operation of this bit is identical to bit 9 of the Control register.

Auto-Negotiation Complete

This read-only bit returns a 1 after the auto-negotiation process has been completed. It remains 1 until the auto-negotiation

process is restarted, a Link Fault occurs, or the chip is reset. If auto-negotiation is disabled or the process is still in progress,

the bit returns a 0.

Acknowledge Complete

This read-only bit returns a 1 after the acknowledgment exchange portion of the auto-negotiation process has been

completed and the Arbitrator state machine has exited the Complete Acknowledge state. It remains this value until the auto-

negotiation process is restarted, a Link Fault occurs, auto-negotiation is disabled, or the BCM5220 is reset.

Acknowledge Detected

This read-only bit is set to 1 when the arbitrator state machine exits the acknowledged detect state. It remains high until the

auto-negotiation process is restarted, or the BCM5220 is reset.

Ability Detect

This read-only bit returns a 1 when the auto-negotiation state machine is in the Ability Detect state. It enters this state a

specified time period after the auto-negotiation process begins, and exits after the first FLP burst or link pulses are detected

from the link partner. This bit returns a 0 any time the auto-negotiation state machine is not in the Ability Detect state.

Super Isolate

Writing a 1 to this bit places the BCM5201 into the Super Isolate mode. Additionally, all link pulses are suppressed. This

allows the BCM5201 to coexist with another PHY on the same adapter card, with only one being activated at any time.

10BASE-T Serial Mode

Writing a 1 to bit 1 of the Auxiliary Mode register enables the 10BASE-T Serial mode. In the special 10BASE-T Serial mode,

data packets traverse to the MAC layer across only TXD0 and RXD0 at a rate of 10 MHz. Serial operation is not available

in 100BASE-X mode.

5220-DS02-R 数据表(PDF) 64 Page - Broadcom Corporation.