DM9621 datasheet(10/66 Pages) DAVICOM

Part #	DM9621

Description	USB2.0 to 10/100M Fast Ethernet Controller

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Manufacturer	DAVICOM [Davicom Semiconductor, Inc.]

Direct Link	http://www.davicom.com.tw

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DM9621

USB2.0 to Fast Ethernet Controller

Preliminary

10

Version: DM9621 -14-DS-P02

February 23, 2011

3.2 48-pin description

I = Input, O = Output, I/O = Input / Output, O/D = Open Drain, P = Power.

Pin No.

Pin Name

Type

Description

RMII Interface

11

TX_EN

O

External RMII Transmit Enable

GPIO2_0 in GPIO mode

12,13

TXD[1:0]

O

External RMII Transmit Data

TXD[1] as GPIO2_1 in GPIO mode

TXD[0] as GPIO2_2 in GPIO mode

14,15

RXD[1:0]

I

External RMII Receive Data

RXD[1] as GPIO2_3 in GPIO mode

RXD[0] as GPIO2_4 in GPIO mode

17

RXDV

I

External RMII Receive Data Valid

GPIO2_5 in GPIO mode

18

MDC

O

MII Serial Management Data Clock

19

MDIO

I/O

MII Serial Management Data

GPIO2_6 in GPIO mode

23

CLK50M

I

RMII 50MHz Clock

GPIO2_7 in GPIO mode

EEPROM Interface

20

EEDIO

I/O

Data to/from EEPROM

21

EECK

O

Clock to EEPROM

22

EECS

O

Chip Select to EEPROM

USB Interface

37

VCC3A

P

3.3V for USB

38

GND

P

Ground for USB

39

RREF

I

Reference resistor to analog USB ground (12K 1% for USB)

40

DM

I/O

USB Data Minus

41

DP

I/O

USB Data Plus

42

VCC33_PLL

P

3.3V for USB PLL

43

GND_PLL

P

Ground for USB PLL

44

VCCOUT

O

1.8V power out for USB

Clock Interface

46

X2

O

Crystal 25MHz Out for Ethernet

47

X1

I

Crystal 25MHz In for Ethernet

35

X1_12M

I

Crystal 12MHz In for USB (Option, used when strap pin 22 EECS

pull-high), Normal N.C. * Note1

36

X2_12M

O

Crystal 12MHz out for USB (Option, used when strap pin 22 EECS

pull-high), Normal N.C. * Note1

* Note1: When strap pin 22 EECS pull-low, 12MHz clock from

internal PLL, detail see 3.3 strap pins table(Page 12)

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DM9621 Datasheet(PDF) 10 Page - Davicom Semiconductor, Inc.

DM9621 Datasheet(HTML) 10 Page - Davicom Semiconductor, Inc.

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