RTL8139D-GR 데이터 시트보기 (PDF) - Realtek Semiconductor

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RTL8139D-GR

SINGLE-CHIP MULTI-FUNCTION 10/100Mbps ETHERNET CONTROLLER WITH POWER MANAGEMENT

Realtek Semiconductor 

RTL8139DL

Datasheet

Bit

R/W

Symbol

Description

frame alignment error (FAE). The collided frame will not be recognized

as CRC error if the length of this frame is shorter than 16 byte.

0

R/W

ROK

Receive (Rx) OK: In normal mode, indicates the successful completion

of a packet reception. In early mode, indicates that the Rx byte count of

the arriving packet exceeds the early Rx threshold.

5.7. Transmit Configuration Register

(Offset 0040h-0043h, R/W)

This register defines the Transmit Configuration for the RTL8139D(L). It controls such functions as

Loopback, Heartbeat, Auto Transmit Padding, programmable Interframe Gap, Fill and Drain Thresholds,

and maximum DMA burst size.

Bit

31

30-26

R/W

-

R

Symbol

-

HWVERID_A

Description

Reserved

Hardware Version ID A:

Bit30 Bit29 Bit28 Bit27 Bit26

RTL8139

1

1

0

0

0

RTL8139A 1 1 1 0 0

RTL8139A-G 1 1 1 0 1

RTL8139B 1 1 1 1 0

RTL8130

1

1

1

1

0

RTL8139C 1 1 1 0 1

RTL8100

1

1

1

1

0

RTL8100B/ 1 1 1 0 1

8139D

RTL8139C+ 1 1 1 0 1

RTL8101

1

1

1

0

1

Reserved

Other combination

Bit23

0

0

0

0

0

0

1

0

1

1

Bit22

0

0

0

0

0

0

0

1

0

1

25-24

23-22

21-19

18, 17

R/W

IFG1, 0

Interframe Gap Time: This field allows the user to adjust the

interframe gap time below the standard: 9.6 us for 10Mbps, 960 ns for

100Mbps. The time can be programmed from 9.6 us to 8.4 us (10Mbps)

and 960ns to 840ns (100Mbps). Note that any value other than (1, 1)

will violate the IEEE 802.3 standard.

The formula for the inter frame gap is:

10 Mbps

8.4us + 0.4(IFG(1:0)) us

100 Mbps

840ns + 40(IFG(1:0)) ns

R

HWVERID_B Hardware Version ID B

-

-

Reserved

R/W

LBK1, LBK0 Loopback test: There will be no packet on the TX+/- lines under the

Loopback test condition. The loopback function must be independent of

the link state.

00 : normal operation

01 : Reserved

10 : Reserved

11 : Loopback mode

Single Chip Multifunction 10/100 Ethernet Controller w/Power Management 14 Track ID: JATR-1076-21 Rev. 1.2

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