5228-DS08-R datasheet(53/100 Pages) BOARDCOM

53 / 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

MII Status Register

Page 41

MII STATUS REGISTER

100BASE-T4 Capability. The BCM5228 is not capable of 100BASE-T4 operation, and returns a 0 when bit 15 of the status

100BASE-X Full-Duplex Capability. The BCM5228 is capable of 100BASE-X full-duplex operation, and returns a 1 when

bit 14 of the Status register is read.

100BASE-X Half-Duplex Capability. The BCM5228 is capable of 100BASE-X half-duplex operation, and returns a 1 when

bit 13 of the Status register is read.

10BASE-T Full-Duplex Capability. The BCM5228 is capable of 10BASE-T full-duplex operation, and returns a 1 when bit

12 of the Status register is read.

10BASE-T Half-Duplex Capability. The BCM5228 is capable of 10BASE-T half-duplex operation, and returns a 1 when bit

11 of the Status register is read.

MF Preamble Suppression. This bit is the only writable bit in the Status register. Setting this bit to a 1 allows subsequent

MII management frames to be accepted with or without the standard preamble pattern. When preamble suppression is

enabled, only two preamble bits are required between successive management commands, instead of the normal 32.

Table 20: MII Status Register (Address 01d, 01h)

Bit

Name

R/W

Description

Default

100BASE-T4 Capability

0 = Not 100BASE-T4 capable

100BASE-TX FDX Capability

1 = 100BASE-TX full-duplex capable

100BASE-TX Capability

1 = 100BASE-TX half-duplex capable

10BASE-T FDX Capability

1 = 10BASE-T full-duplex capable

10BASE-T Capability

1 = 10BASE-T half-duplex capable

10:7

Reserveda

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

–

0000

MF Preamble Suppression

R/W

1 = Preamble may be suppressed

0 = Preamble always required

Auto-Negotiation Complete

1 = Auto-negotiation process completed

0 = Auto-negotiation process not completed

Remote Fault

1 = Far-End Fault condition detected

0 = No Far-End Fault condition detected

Auto-Negotiation Capability

1 = Auto-negotiation capable

0 = Not auto-negotiation capable

2Link Status

1 = Link is up (Link Pass state)

0 = Link is down (Link Fail state)

Jabber Detect

1 = Jabber condition detected

0 = No Jabber condition detected

Extended Capability

1 = Extended register capable

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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