AX88772 ASIX [ASIX Electronics Corporation], AX88772 Datasheet - Page 4

• Manufacturer Part Number: AX88772
• Description: USB to 10/100 Fast Ethernet/HomePNA Controller
• Manufacturer: ASIX [ASIX Electronics Corporation]

1.0 Introduction
1.1 General Description
The AX88772 USB to 10/100 Fast Ethernet/HomePNA/HomePlug controller is a high performance and highly integrated
ASIC with embedded 28KB SRAM for packet buffering. It enables low cost and affordable Fast Ethernet network
connection to desktop, notebook PC, and embedded system using popular USB ports. It has an USB interface to
communicate with USB host controller and is compliant with USB specification V1.0, V1.1 and V2.0. It implements
10/100Mbps Ethernet LAN function based on IEEE802.3, and IEEE802.3u standards or HomePNA standard. It
integrates an on-chip 10/100Mbps Ethernet PHY to simplify system design and provides an optional media-independent
interface (MII) for implementing Fast Ethernet and HomePNA functions.
The AX88772 needs 12MHz clock for USB operation and 25Mhz clock for Fast Ethernet operation. It is in 128-pin LQFP
low profile package with CMOS process and requires only single 3.3V power supply to operate.
1.2 AX88772 Block Diagram
GPIO2~0
EECS
EECK
EEDI
EEDO
Purpose I/O
SEEPROM
Loader I/F
General
SRAM
28KB
Figure 1: AX88772 Block Diagram
USB to 10/100 Fast Ethernet/HomePNA Controller
Memory Arbiter
Ethernet
USB to
Bridge
USB Core and Interface
4
DP/DM
DPRS/DMRS
ASIX ELECTRONICS CORPORATION
Ethernet
10/100
MAC
STA
Core
PHY
RXIP/RXIN
TXOP/TXON
MII I/F
MDC
MDIO
AX88772