DM9000B Просмотр технического описания (PDF) - Davicom Semiconductor, Inc.

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DM9000B

Ethernet Controller With General Processor Interface

Davicom Semiconductor, Inc. 

DM9000B

Ethernet Controller with General Processor Interface

6.2 Network Status Register (01H)

Bit

Name

Default

Description

7

SPEED

X,RO

Media Speed 0:100Mbps 1:10Mbps, when Internal PHY is used. This bit has no

meaning when LINKST=0

6

LINKST

X,RO Link Status 0:link failed 1:link OK,

5

WAKEST

P0, Wakeup Event Status. Clears by read or write 1 (work in 8-bit mode)

RW/C1 This bit will not be affected after software reset

4 RESERVED 0,RO Reserved

3

TX2END

PS0, TX Packet 2 Complete Status. Clears by read or write 1

RW/C1 Transmit completion of packet index 2

2

TX1END

PS0, TX Packet 1 Complete status. Clears by read or write 1

RW/C1 Transmit completion of packet index 1

1

RXOV

PS0,RO RX FIFO Overflow

0 RESERVED 0,RO Reserved

6.3 TX Control Register (02H)

Bit

Name

Default

7 RESERVED 0,RO

6

TJDIS

PS0,RW

5

EXCECM PS0,RW

4 PAD_DIS2 PS0,RW

3 CRC_DIS2 PS0,RW

2 PAD_DIS1 PS0,RW

1 CRC_DIS1 PS0,RW

0

TXREQ

PS0,RW

Description

Reserved

Transmit Jabber Disable

When set, the transmit Jabber Timer (2048 bytes) is disabled. Otherwise it is

Enable

Excessive Collision Mode Control : 0:aborts this packet when excessive collision

counts more than 15, 1: still tries to transmit this packet

PAD Appends Disable for Packet Index 2

CRC Appends Disable for Packet Index 2

PAD Appends Disable for Packet Index 1

CRC Appends Disable for Packet Index 1

TX Request. Auto clears after sending completely

6.4 TX Status Register I ( 03H ) for packet index I

Bit

Name

Default

Description

Transmit Jabber Time Out

7

TJTO

PS0,RO It is set to indicate that the transmitted frame is truncated due to more than 2048

bytes are transmitted

Loss of Carrier

6

LC

PS0,RO It is set to indicate the loss of carrier during the frame transmission. It is not valid in

internal Loop-back mode

No Carrier

5

NC

PS0,RO It is set to indicate that there is no carrier signal during the frame transmission. It is

not valid in internal Loop-back mode

4

LC

PS0,RO

Late Collision

It is set when a collision occurs after the collision window of 64 bytes

3

COL

PS0,RO

Collision Packet

It is set to indicate that the collision occurs during transmission

2

EC

PS0,RO

Excessive Collision

It is set to indicate that the transmission is aborted due to 16 excessive collisions

1:0 RESERVED 0,RO Reserved

Final

15

Version: DM9000B-13-DS-F02

June 4, 2009

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