ASIX ELECTRONICS CORPORATION

4

AX88172

PRELIMINARY

1.0 Introduction

1.1 General Description:

The AX88172 USB to Fast Ethernet Controller is a high performance and highly integrated USB bus Ethernet Controller

with embedded 7K*16 bit SRAM. The AX88172 supported Full/High Speed USB Device with bus power capability. The

AX88172 implements both 10Mbps and 100Mbps Ethernet function based on IEEE802.3/ IEEE802.3u LAN standard.

The AX88172 supports media-independent interface (MII) to simplify the design on implementing Fast Ethernet and

HomePNA functions.

AX88172 uses 80-pin LQFP low profile package, 12MHz operation for USB and 25MHz operation for Ethernet, CMOS

process with pure 3.3V operation.

1.2 AX88172 Block Diagram:

Fig – 1 AX88172 Block Diagram

MAC

Core

Memory Arbiter

USB to

Ethernet

Bridge

USB Core and Interface

STA

SEEPROM

Loader I/F

DM/DP

MII /IF

MDC

MDIO

EECS

EECK

EEDI

EEDO

7K* 16

SRAM