5228-DS05-R datasheet(55/100 Pages) BOARDCOM

55 / 100 page

Data Sheet

BCM5228

7/12/04

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

Document

5228-DS09-405-R

Auto-Negotiation Advertisement Register

Page 43

AUTO-NEGOTIATION ADVERTISEMENT REGISTER

Next Page. The BCM5228 supports the Next Page function.

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. 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.

Advertise. Bits 9:5 of the Advertisement register allow the user to customize the ability information transmitted to the link

partner. The default value for each bit reflects the abilities of the BCM5228. By writing a 1 to any of the bits, the corresponding

ability is transmitted to the link partner. Writing a 0 to any bit causes the corresponding ability to be suppressed from

transmission. Resetting the chip restores the default bit values. Reading the register returns the values last written to the

corresponding bits, or else the default values if no write has been completed since the last chip reset.

Advertise Selector Field. Bits 4:0 of the Advertisement register contain the value 00001, indicating that the chip belongs

to the 802.3 class of PHY transceivers.

Table 22: 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.”

––

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

Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear

after read operation.

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