DM9010EP datasheet(19/62 Pages) DAVICOM

19 / 62 page

DM9010

Single Chip Ethernet Controller with General Processor Interface

Preliminary

Version: DM9010-17--DS-P04

Jan. 18, 2006

DIS_CRC

PHS0,RW

Discard CRC Error Packet

ALL

PHS0,RW

Pass All Multicast

RUNT

PHS0,RW

Pass Runt Packet

PRMSC

PHS0,RW

Promiscuous Mode

RXEN

PHS0,RW

RX Enable

6.7 RX Status Register ( 06H )

Bit

Name

Default

Description

PHS0,RO

Runt Frame

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

PHS0,RO

Multicast Frame

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

LCS

PHS0,RO

Late Collision Seen

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

RWTO

PHS0,RO

Receive Watchdog Time-Out

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

PLE

PHS0,RO

Physical Layer Error

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

PHS0,RO

Alignment Error

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

PHS0,RO

CRC Error

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

FOE

PHS0,RO

FIFO Overflow Error

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

6.8 Receive Overflow Counter Register ( 07H )

Bit

Name

Default

Description

RXFU

PHS0,R/C

Receive Overflow Counter Overflow

This bit is set when the ROC has an overflow condition

6:0

ROC

PHS0,R/C

Receive Overflow Counter

This is a statistic counter to indicate the received packet count upon FIFO overflow

6.9 Back Pressure Threshold Register (08H)

Bit

Name

Default

Description

7:4

BPHW

PHS3,

Back Pressure High Water Overflow Threshold. MAC will generate the jam pattern

when RX SRAM free space is lower than this threshold value

Default is 3K-byte free space. Please do not exceed SRAM size

(1 unit=1K bytes)

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