DM9000BI Просмотр технического описания (PDF) - Davicom Semiconductor, Inc.

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DM9000BI

Industrial-grade Ethernet Controller with General Processor Interface

Davicom Semiconductor, Inc. 

DM9000BI

Industrial-grade Ethernet Controller with General Processor Interface

6.5 TX Status Register II ( 04H ) for packet index I 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, 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

6.6 RX Control Register ( 05H )

Bit

Name

Default

7 RESERVED PS0,RW

6

WTDIS PS0,RW

5 DIS_LONG PS0,RW

4 DIS_CRC PS0,RW

3

ALL

PS0,RW

2

RUNT PS0,RW

1

PRMSC PS0,RW

0

RXEN PS0,RW

Description

Reserved

Watchdog Timer Disable

When set, the Watchdog Timer (2048 bytes) is disabled. Otherwise it is enabled

Discard Long Packet

Packet length is over 1522byte

Discard CRC Error Packet

Pass All Multicast

Pass Runt Packet

Promiscuous Mode

RX Enable

6.7 RX Status Register ( 06H )

Bit

Name

Default

7

RF

PS0,RO

6

MF

PS0,RO

5

LCS

PS0,RO

4

RWTO PS0,RO

3

PLE

PS0,RO

2

AE

PS0,RO

1

CE

PS0,RO

0

FOE

PS0,RO

Description

Runt Frame

It is set to indicate that the size of the received frame is smaller than 64 bytes

Multicast Frame

It is set to indicate that the received frame has a multicast address

Late Collision Seen

It is set to indicate that a late collision is found during the frame reception

Receive Watchdog Time-Out

It is set to indicate that it receives more than 2048 bytes

Physical Layer Error

It is set to indicate that a physical layer error is found during the frame reception

Alignment Error

It is set to indicate that the received frame ends with a non-byte boundary

CRC Error

It is set to indicate that the received frame ends with a CRC error

FIFO Overflow Error

It is set to indicate that a FIFO overflow error happens during the frame reception

Preliminary

16

Version: DM9000BI-13-DS-P02

January 17, 2008

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