5228-DS08-R datasheet(57/100 Pages) BOARDCOM

57 / 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 Expansion Register

Page 45

AUTO-NEGOTIATION EXPANSION REGISTER

Parallel Detection Fault. Bit 4 of the Auto-Negotiation Expansion register is a read-only bit that gets latched high when a

parallel detection fault occurs in the auto-negotiation state machine. For further details, consult the IEEE standard. The bit

is reset to 0 after the register is read or when the chip is reset.

Link Partner Next Page Able. Bit 3 of the Auto-Negotiation Expansion register returns a 1 when the link partner has Next

Page capabilities. It has the same value as bit 15 of the Link Partner Ability register.

Next Page Able. The BCM5228 Returns 1 when bit 2 of the auto-negotiation Expansion register is read indicating that it has

Next Page capabilities.

Page Received. Bit 1 of the Auto-Negotiation Expansion register is latched high when a new link code word is received from

the link partner, checked, and acknowledged. It remains high until the register is read, or until the chip is reset.

Link Partner Auto-Negotiation Able. Bit 0 of the Auto-Negotiation Expansion register returns a 1 when the link partner is

known to have auto-negotiation capability. Before any auto-negotiation information is exchanged, or if the link partner does

not comply with IEEE auto-negotiation, the bit returns a value of 0.

Table 24: Auto-Negotiation Expansion Register (Address 06d, 06h)

Bit

Name

R/W

Description

Default

15:5

Reserveda

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

–

000h

Parallel Detection Fault

1 = Parallel detection fault.

0 = No parallel detection fault

Link Partner Next Page Able

1 = Link partner has next page capability

0 = Link partner does not have next page

Next Page Able

1 = Next page able

Page Received

1 = New page has been received

0 = New page has not been received

Link Partner Auto-Negotiation Able

1 = Link partner has auto-negotiation capability

0 = Link partner does not have auto-negotiation

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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