RTL8208 データシートの表示（PDF） - Realtek Semiconductor

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RTL8208

REALTEK SINGLE CHIP OCTAL 10/100 MBPS FAST ETHERNET TRANSCEIVER

Realtek Semiconductor 

RTL8208

6.2 Register1: Status

Reg. bit

1.15

1.14

1.13

1.12

1.11

1.[10:7]

1.6

1.5

1.4

1.3

1.2

1.1

1.0

Name

100Base_T4

100Base_TX_FD

100Base_TX_HD

10Base_T_FD

10Base_T_HD

Reserved

MF Preamble

Suppression

Auto-negotiate

Complete

Remote Fault

Auto-Negotiation

Ability

Link Status

Jabber Detect

Extended Capability

Description

Mode

0 = no 100Base-T4 capability.

RO

1=100Base-TX full duplex capable.

RO

0=Not 100Base-TX full duplex capable.

1=100Base-TX half duplex capable.

RO

0=Not 100Base-TX half duplex capable.

1=10Base-TX full duplex capable.

RO

0=Not 10Base-TX full duplex capable.

1=10Base-TX half duplex capable.

RO

0=Not 10Base-TX half duplex capable.

RO

The RTL8208 will accept management frames with RO

preamble suppressed.

1=Auto-negotiation process completed. Reg.4,5 are valid if RO

this bit is set.

0=Auto-negotiation process not completed.

1=Remote fault indication from link partner has been

RO/LH

detected.

0=No remote fault indication detected.

When in 100FX mode, this bit means in-band signal

Far-End-Fault is detected. Refer to FX MODE section.

1=Nway Auto-negotiation capable. (permanently =1)

RO

0=Without Nway Auto-negotiation capability.

1=Link has never failed since previous read.

RO/LL

0=Link has failed since previous read.

If link fails, this bit will be set to 0 until bit is read.

1=Jabber detected.

RO/LH

0=No Jabber detected.

The jabber function is disabled in 100Base-X mode. Jabber

is supported only in 10Base-T mode.

1=Extended register capable. (permanently =1)

RO

0=Not extended register capable.

Default

0

1

1

1

1

0

1

0

0

1

0

0

1

100Base_T4 – The RTL8208 does not support the T4 function. Any reads to this bit will return a ‘0’.

100Base_TX_FD – The RTL8208 is capable of operating in 100Base-TX full duplex mode.

100Base_TX_HD – The RTL8208 is capable of operating in 100Base-TX half duplex mode.

10Base_T_FD – The RTL8208 is capable of operating in 10Base-T full duplex mode.

10Base_T_HD – The RTL8208 is capable of operating in 10Base-T half duplex mode.

Reserved – Ignore the output of the RTL8208 when these bits are read.

MF Preamble Suppression – Management Frame Preamble Suppression is permanently set in the RTL8208, allowing

subsequent MII management frames to be accepted with or without the standard preamble pattern. Only two preamble bits are

required between successive management commands, instead of the normal 32, however, a minimum of 32 preamble bits are

required for the first SMI read/write transaction after reset. One idle bit is required between any two management transactions (as

defined in IEEE802.3u spec). Reads of this bit will always return a ‘1’.

Auto-negotiate Complete – Bit 5 will return a ‘1’ if the Auto-negotiation process has been completed and the contents of

registers 4 and 5 are valid.

Remote Fault – When link partner detect far-end fault, it would send far-end indication stream pattern. When RTL8208 receive

this pattern, set Reg1.4=1.

Auto-Negotiation Ability – The RTL8208 is capable of performing IEEE Auto-negotiation, and will return a ‘1’ when bit 4 is

read, regardless of whether or not the Auto-negotiation function has been disabled.

Link Status – The RTL8208 will return a ‘1’ on bit 2 when the link state machine is in Link Pass, indicating that a valid link has

been established. Otherwise, it will return ‘0’. When a link failure occurs after the link pass state has been entered, the Link

2003/04/04

14

Rev.1.97

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