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DM9000

ISA to Ethernet MAC Controller with Integrated 10/100 PHY

Davicom Semiconductor, Inc. 

DM9000

ISA to Ethernet MAC Controller with Integrated 10/100 PHY

6.7 RX Status Register ( 06H )

Bit

Name

Default

7

RF

0,RO

6

MF

0,RO

5

LCS

0,RO

4

RWTO

0,RO

3

PLE

0,RO

2

AE

0,RO

1

CE

0,RO

0

FOE

0,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

6.8 Receive Overflow Counter Register ( 07H )

Bit

Name

Default

Description

7

RXFU

0,R/C Receive Overflow Counter Overflow

This bit is set when the ROC has an overflow condition

6:0

ROC

0,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

3H, RW 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)

3:0

JPT

7H, RW Jam Pattern Time. Default is 200us

bit3 bit2 bit1 bit0 time

0000

5us

0001

10us

0010

15us

0011

25us

0100

50us

0 1 0 1 100us

0 1 1 0 150us

0 1 1 1 200us

1 0 0 0 250us

1 0 0 1 300us

1 0 1 0 350us

1 0 1 1 400us

1 1 0 0 450us

1 1 0 1 500us

1 1 1 0 550us

1 1 1 1 600us

Final

15

Version: DM9000-DS-F03

April 23, 2009

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