5220-DS03-R datasheet(41/90 Pages) BOARDCOM

41 / 90 page

Preliminary Data Sheet

BCM5220

04/20/04

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

Document

5220-DS04-405-R

MII Status Register

Page 29

AUTO-NEGOTIATION ADVERTISEMENT REGISTER

The BCM5220 supports the next page function.

Reserved Bits

Ignore output when read.

Remote Fault

Writing a 1 to bit 13 of the Advertisement register causes a remote fault indicator to be sent to the link partner during auto-

negotiation. Writing a 0 to this bit or resetting the chip clears the remote fault transmission bit. This bit returns the value last

written to it, or else 0 if no write has been completed since the last chip reset.

Reserved Technologies Bits

Ignore output when read.

Pause

Pause operation for full-duplex links. The use of this bit is independent of the negotiated data rate, medium, or link

technology. The setting of this bit indicates the availability of additional DTE capability when full-duplex operation is in use.

This bit is used by one MAC to communicate pause capability to its link partner and has no effect on PHY operation.

Table 12: Auto-Negotiation Advertisement Register (Address 04d, 04h)

Bit

Name

R/W

Description

Default

R/W

1 = Next page ability is enabled

0 = Next page ability is disabled

Reserveda

a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”

Ignore when read

Remote Fault

R/W

1 = Transmit remote fault

12:11

Reserved Technologies

Ignore when read

Pause

R/W

1 = Pause operation for full-duplex

Advertise 100BASE-T4

R/W

1 = Advertise T4 capability

0 = Do not advertise T4 capability

Advertise 100BASE-X FDX

R/W

1 = Advertise 100BASE-X full-duplex

0 = Do not advertise 100BASE-X full-duplex

Advertise 100BASE-X

R/W

1 = Advertise 100BASE-X

Advertise 10BASE-T FDX

R/W

1 = Advertise 10BASE-T full-duplex

0 = Do not advertise 10BASE-T full-duplex

Advertise 10BASE-T

R/W

1 = Advertise 10BASE-T

4:0

Advertise Selector Field

R/W

Indicates 802.3

00001

Notes: R/W = Read/Write, RO = Read only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL & LH Clear after

read operation. Use default values of reserved bit(s) when writing to reserved bit(s).

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