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RTL8139C

REALTEK 3.3V SINGLE CHIP FAST ETHERNET CONTROLLER WITH POWER MANAGEMENT

Realtek Semiconductor 

RTL8139C(L)

6.22 Auto-negotiation Expansion Register

(Offset 006Ah-006Bh, R)

This register contains additional status for NWay auto-negotiation.

Bit

Name

Description/Usage

Default/ Attribute

15-5

-

Reserved. These bits are always set to 0.

-

4

MLF

Status indicating if a multiple link fault has occurred.

0, RO

1 = fault occurred; 0 = no fault occurred.

3

LP_NP_ABLE Status indicating if the link partner supports Next Page negotiation.

0, RO

1 = supported; 0 = not supported.

2

NP_ABLE This bit indicates if the local node is able to send additional Next

0, RO

Pages.

1

PAGE_RX This bit is set when a new Link Code Word Page has been received.

0, RO

The bit is automatically cleared when the auto-negotiation link

partner’s ability register (register 5) is read by management.

0

LP_NW_ABLE 1 = link partner supports NWay auto-negotiation.

0, RO

6.23 Disconnect Counter

(Offset 006Ch-006Dh, R)

Bit

Name

Description/Usage

15-0

DCNT

This 16-bit counter increments by 1 for every disconnect event. It rolls

over when becomes full. It is cleared to zero by read command.

Default/ Attribute

h'[0000],

R

6.24 False Carrier Sense Counter

(Offset 006Eh-006Fh, R)

This counter provides information required to implement the “False Carriers” attribute within the MAU managed object class of

Clause 30 of the IEEE 802.3u specification.

Bit

Name

Description/Usage

Default/ Attribute

15-0

FCSCNT This 16-bit counter increments by 1 for each false carrier event. It is

h'[0000],

cleared to zero by read command.

R

6.25 NWay Test Register

(Offset 0070h-0071h, R/W)

Bit

Name

Description/Usage

15-8

-

Reserved

7

NWLPBK 1 = set NWay to loopback mode.

6-4

-

Reserved

3

ENNWLE 1 = LED0 Pin indicates linkpulse

2

FLAGABD 1 = Auto-neg experienced ability detect state

1

FLAGPDF 1 = Auto-neg experienced parallel detection fault state

0

FLAGLSC 1 = Auto-neg experienced link status check state

Default/ Attribute

-

0, RW

-

0, RW

0, RO

0, RO

0, RO

2002/01/10

28

Rev.1.4

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