5220-DS02-R datasheet(45/90 Pages) BOARDCOM

45 / 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 33

AUTO-NEGOTIATION EXPANSION REGISTER

Table 14 shows the Auto-Negotiation Expansion Register bit descriptions.

Reserved Bits

Ignore when read.

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, refer to 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 BCM5220 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.

Table 14: Auto-Negotiation Expansion Register (Address 00110b, 6d, 06h)

Bit

Name

R/W

Description

Default

15:5

Reserveda

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

Ignore when read

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 = BCM5220 does have next page capability

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 are cleared

after read operation)

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