5222-DS02-R datasheet(32/76 Pages) BOARDCOM

32 / 76 page

BCM5222

Preliminary Data Sheet

7/20/04

Broadcom Corporation

Page 20

MII Status Register

Document 5222-DS02-405-R

MII STATUS REGISTER

The MII status register bit descriptions are shown in Table 8.

100BASE-T4 CAPABILITY

The BCM5222 is not capable of 100BASE-T4 operation, and returns a 0 when bit 15 of the status register is read.

100BASE-TX FULL-DUPLEX CAPABILITY

The BCM5222 is capable of 100BASE-TX full-duplex operation, and returns a 1 when bit 14 of the Status register is read.

100BASE-TX HALF-DUPLEX CAPABILITY

The BCM5222 is capable of 100BASE-TX half-duplex operation, and returns a 1 when bit 13 of the Status register is read.

10BASE-T FULL-DUPLEX CAPABILITY

The BCM5222 is capable of 10BASE-T full-duplex operation, and returns a 1 when bit 12 of the Status register is read.

Table 8: 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

Reserved

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

Link 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)

5222-DS02-R 数据表(PDF) 32 Page - Broadcom Corporation.

5222-DS02-R 数据表(HTML) 32 Page - Broadcom Corporation.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

数据表下载