DM9621 datasheet(25/66 Pages) DAVICOM

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DM9621

USB2.0 to Fast Ethernet Controller

Preliminary

Version: DM9621 -14-DS-P02

February 23, 2011

4.33 USB Packet Error Counter (82H)

Bit

Name

Default

Description

7-0

USB_ERR

PHS0,RW/C

USB Data Error Count

This counter is increased when there has been data CRC error in USB

packet. This counter can be cleared by read if register 5 is “0” or by write to

this register with any data.

4.34 Ethernet Receive Packet CRC Error Counter (83H)

Bit

Name

Default

Description

7-0

RX_ERR

PHS0,RW/C

Ethernet RX Packet CRC Error Count

This counter is increased when there has been CRC error in Ethernet receive

packet. This counter can be cleared by read if register 5 is “0” or by write to

this register with any data.

4.35 Ethernet Transmit Excessive Collision Counter (84H)

Bit

Name

Default

Description

7-0

ECOL_CTR

PHS0,RW/C

Ethernet TX Packet Excessive Collision Count

This counter is increased when there has been excessive collision, i.e.

continued 16 collisions, in Ethernet transmit packet. This counter can be

cleared by read if register 5 is “0” or by write to this register with any data.

4.36 Ethernet Transmit Collision Counter (85H)

Bit

Name

Default

Description

7-0

COL_CTR

PHS0,RW/C

Ethernet TX Packet Collision Count

This counter is increased when there has been collision in Ethernet transmit

packet. This counter can be cleared by read if register 5 is “0” or by write to

this register with any data.

4.37 Ethernet Transmit Late Collision Counter (86H)

Bit

Name

Default

Description

7-0

LCOL_CTR

PHS0,RW/C

Ethernet TX Packet Late Collision Count

This counter is increased when there has been late collision in Ethernet

transmit packet. This counter can be cleared by read if register 5 is “0” or by

write to this register with any data.

4.38 RX Header Control/Status Register (91H)

Bit

Name

Default

Description

MODE9620

PT0,RW

RX header mode

0: DM9601 compatiable, 3-byte RX header : RX_status, byte_ctr_low,

byte_ctr_high

1: DM9621 mode, 4-byte RX header : RX _flag, RX_status, byte_ctr_low,

byte_ctr_high

6~1

RESERVED

P,RO

Reserved

RESERVED

P0,RW

Reserved

RESERVED

P0,RW

Reserved

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