RTL8201 データシートの表示（PDF） - Realtek Semiconductor

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RTL8201

REALTEK SINGLE CHIP SINGLE PORT 10/100MBPS FAST ETHERNET PHYCEIVER

Realtek Semiconductor 

RTL8201(L)

4:<6>

10FD

10Base-T-FD: This bit advertises the ability to the Link Partner that the

RTL8201L can operate in 10Base-T full duplex mode. Writing a ‘0’ to

this bit will suppress the transmission of this ability to the Link Partner.

Resetting the chip will restore the default value. The default value is ‘1’

and writing a ‘1’ will set this bit to ‘1’. Reading this bit will return the

last written value or the default value if no write has been completed

since the last reset.

1, RW

4:<5>

1: 10Base-T full duplex supported by local node

0: 10Base-T full duplex not supported by local node

10

10Base-T: This bit advertises the ability to the Link Partner that the

1, RW

RTL8201L can operate in 10Base-T half duplex mode. Writing a ‘0’ to

this bit will suppress the transmission of this ability to the Link Partner.

Resetting the chip will restore the default value. The default value is ‘1’

and writing a ‘1’ will set this bit to ‘1’. Reading this bit will return the

last written value or the default value if no write has been completed

since the last reset.

4:<4:0>

Selector

1: 10Base-T is supported by local node

0: 10Base-T not supported by local node

Selector Field: This field reflects the binary encoded selector supported

by this node. Bits 4:0 contain a fixed value of <00001>, representing

CSMA/CD, is specified. This indicates that the chip belongs to the

802.3 class of PHY transceivers. No other protocols are supported.

<00001>, RW

6.6 Register 5 Auto-Negotiation Link Partner Ability

(ANLPAR)

This register contains the advertised abilities of the Link Partner as received during Auto-negotiation. The content changes

after the successful Auto-negotiation if Next-pages are supported.

Address

Name

Description/Usage

Default/Attribute

5:<15>

NP

Next Page: Bit 15 returns a value of ‘1’ when the Link Partner

0, RO

implements the Next Page function and has Next Page information that

it wants to transmit. However, since the RTL8201L does not implement

the Next Page function, it ignores the Next Page bit, except to copy it to

this register.

5:<14>

ACK

0: Transmitting the primary capability data page

1: Transmitting the protocol specific data page

Acknowledge: Bit 14 is used by Auto-negotiation to indicate that a

device has successfully received its Link Partner’s Link Code Word.

0, RO

5:<13>

1: Link partner acknowledges reception of local node’s capability data word

0: No acknowledgement

RF

Remote Fault: Bit 13 returns a value of ‘1’ when the Link Partner

0, RO

signals that it has detected a remote fault. The RTL8201L advertises this

information, but does not act upon it.

5:<12:11>

5:<10>

Reserved

Pause

1: Link partner is indicating a remote fault

0: Link partner does not indicate a remote fault

Reserved: Ignore the output of the RTL8201L when these bits are

read.

Pause: Indicates that the Link Partner pause bit is set.

0, RO

5:<9>

1: Flow control is supported by Link partner

0: Flow control is NOT supported by Link partner

T4

100Base-T4: This bit indicates that the Link Partner can support

0, RO

100Base-T4 mode. This bit is cleared any time Auto-negotiation is

restarted or the RTL8201L is reset.

1: 100Base-T4 is supported by link partner

0: 100Base-T4 not supported by link partner

2002-01-18

12

Rev.1.04

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