DM9621A datasheet(9/66 Pages) DAVICOM

Part #	DM9621A

Description	USB2.0 to Fast Ethernet Controller

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Manufacturer	DAVICOM [Davicom Semiconductor, Inc.]

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

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DM9621A

USB2.0 to Fast Ethernet Controller

Final

Doc No: DM9621A-13-MCO-DS-F01

June 30, 2015

9

3.2 48-Pin QFN with RMII Interface

I = Input

O = Output

I/O = Input / Output

O/D = Open Drain

P = Power

3.2.1 RMII Interface

Pin No.

Pin Name

I/O

Description

11

TXE

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

3.2.2 EEPROM Interface

Pin No.

Pin Name

I/O

Description

20

EEDIO

I/O

Data to/from EEPROM

21

EECK

O

Clock to EEPROM

22

EECS

O

Chip Select to EEPROM

3.2.3 USB Interface

Pin No.

Pin Name

I/O

Description

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

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DM9621A Datasheet(PDF) 9 Page - Davicom Semiconductor, Inc.

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