DM9621 datasheet(14/66 Pages) DAVICOM

14 / 66 page

DM9621

USB2.0 to Fast Ethernet Controller

Preliminary

Version: DM9621 -14-DS-P02

February 23, 2011

USBDA

USB device address register

F0H

00H

RXC

Received packet counter register

F1H

00H

TXC/USBS

Transmit packet counter/USB status register

F2H

10H

USBC

USB control register

F4H

00H

Key to Default

In the register description that follows, the default column

takes the form:

Where：

<Reset Value>:

Bit set to logic one

Bit set to logic zero

No default value

P = power on reset default value

H = hardware reset command default value

S = software reset default value

E = default value from EEPROM

T = default value from strap pin

<Access Type>:

RO = Read only

RW = Read/Write

R/C = Read and Clear

RW/C1=Read/Write and Cleared by write 1

WO = Write only

Reserved bits are shaded and should be written with 0.

Reserved bits are undefined on read access.

4.1 Network Control Register (00H)

Bit

Name

Default

Description

EXT_PHY

PT0,RW

External PHY mode (valid when pin TEST1 tie to ground)

1: Select external PHY

0: select Internal PHY.

This bit can be forced by register 2DH bit 5.

WAKEEN

PE0,RW

Wakeup event enable

When set, it enables the wakeup function.

Clearing this bit will also clear all wakeup event status.

WCR_MODE

PHS,RW

Write To Clear Mode

When set, the following register bits are cleared by write ‘1” .

FCOL

PHS0,RW Force Collision in Loopback Mode

Used for testing only.

FDX

PHS0,RW Full-Duplex mode.

1: Full-Duplex mode

0: Half-Duplex mode

Read only in Internal PHY mode.

This bit can be written only in External PHY mode.

This bit can also be forced by register 2EH bit 5 and 1.

2:1

LBK

PH00,RW

Loopback mode

Bit 2 1

normal

MAC internal loopback

internal PHY digital loopback

internal PHY analog loopback

RST

PH0,RW

Software Reset

When write “1” to this bit, DM9621 enters software reset mode and will be

automatically cleared after 10us.

Write “0” to this bit can end the software reset mode.

DM9621 Datasheet(PDF) 14 Page - Davicom Semiconductor, Inc.

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