5220-DS02-R datasheet(38/90 Pages) BOARDCOM

38 / 90 page

BCM5220

Preliminary Data Sheet

04/20/04

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

Page 26

MII Status Register

Document

5220-DS04-405-R

MII STATUS REGISTER

The MII status register bit descriptions are shown in Table 10.

100BASE-T4 Capability

The BCM5220 is not capable of 100BASE-T4 operation, and returns a 0 when bit 15 of the status register is read.

100BASE-X Full-Duplex Capability

The BCM5220 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 BCM5220 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 BCM5220 is capable of 10BASE-T full-duplex operation, and returns a 1 when bit 12 of the Status register is read.

Table 10: MII Status Register (Address 00001B, 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.”

Ignore when read

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 are cleared

after read operation)

5220-DS02-R 数据表(PDF) 38 Page - Broadcom Corporation.

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