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Home >> Products >> SuperSpeed USB-to-LAN ICs >> USB 2.0 to Fast Ethernet >> AX88172A

ASIX Electronics Corporation    AX88172A  Product Introduction   v1.0

 AX88172A -- Single chip USB 2.0 to MII, single chip MII to Ethernet and USB Bridging controller in Dual-PHY mode

The AX88172A is a high performance and highly integrated ASIC which enables a low cost, small form factor, and simple plug-and-play Fast Ethernet network connection capability for desktops, notebook PC's, UMPC's, cradles/port replicators/docking stations, game consoles, digital-home appliances, and any embedded system using a standard USB port.

The AX88172A features a USB interface to communicate with a USB Host Controller and is compliant with USB specification V1.1 and V2.0. The AX88172A implements 10/100Mbps Ethernet LAN function based on IEEE802.3 and IEEE802.3u standards with 24KB of embedded SRAM for packet buffering. In addition, it integrates an on-chip 10/100Mbps Ethernet PHY, simplifying system design. The AX88172A has a wide array of features including support for HP Auto-MDIX, Wake-on-LAN power management, and IEEE 802.3x/backpressure flow control. Optional serial interfaces such as I²C, SPI, and UART are provided as a control channel from the USB Host Controller to communicate with the external MCU chip.

The AX88172A, USB 2.0 to MII controller, provides an optional External Media Interface (EMI) for an external PHY or an external MAC depending on different application purposes. The EMI can be a media-independent interface (MII) for implementing 100BASE-FX Ethernet or HomePNA functions. The EMI can also be a Reverse-MII or Reverse Reduced-MII (Reverse-RMII) for glueless MAC-to-MAC connections to any MCU with Ethernet MAC MII or RMII interface. In addition, the EMI can be configured to Dual-PHY mode allowing the AX88172A to act as an Ethernet PHY or USB 2.0 PHY for external MAC devices that need Ethernet and USB interfaces in system applications. The potential and flexibility of Dual-PHY mode singles out the AX88172A as an ideal solution for growing applications such as WiMAX-to-USB modems, WiMAX ExpressCard modems, and HomePlug Powerline adapters.



  • USB Device Interface
    • Integrates on-chip USB 2.0 transceiver and SIE compliant to USB Spec 1.1 and 2.0
    • Supports USB Full and High Speed modes with Bus-Power or Self-Power capability
    • Supports 4 or 6 programmable endpoints on USB interface
    • High performance packet transfer rate over USB bus using proprietary burst transfer mechanism (US Patent Approval)
    • Supports USB to Ethernet bridging or vice versa in hardware
  • Fast Ethernet Controller
    • Integrates 10/100Mbps Fast Ethernet MAC/PHY
    • IEEE 802.3 10BASE-T/100BASE-TX compatible
    • Supports twisted pair crossover detection and auto-correction (HP Auto-MDIX)
    • Embedded 16KB SRAM for RX packet buffering and 8KB SRAM for TX packet buffering
    • Supports both Full-duplex with flow control and Half-duplex with backpressure operation
    • Supports 2 VLAN ID filtering, received VLAN Tag (4 bytes) can be stripped off or preserved
    • MAC/PHY loop-back diagnostic capability
  • Support Wake-on-LAN Function
    • Supports Suspend mode and Remote Wakeup via Link-up, Magic packet, MS wakeup frame and external pin
    • Optional PHY power down during Suspend mode
  • Versatile External Media Interface
    • Optional MII interface in MAC mode allows AX88172A to work with external 100BASE-FX Ethernet PHY or HomePNA PHY
    • Optional Reverse-MII or Reverse-RMII interface in PHY mode allows AX88172A to work with external HomePlug PHY or glueless MAC-to-MAC connections
    • Optional Reverse-MII interface in Dual-PHY mode (US Patent Pending) allows AX88172A to act as an Ethernet PHY or USB 2.0 PHY for external MAC device that needs Ethernet and USB in system application
  • Supports 256/512 bytes (93c56/93c66) of serial EEPROM (for storing USB Descriptors)
  • Supports automatic loading of Ethernet ID, USB Descriptors and Adapter Configuration from EEPROM after power-on initialization
  • Provides optional serial interface, I²C, SPI and UART
  • Integrates on-chip voltage regulator and only requires a single 3.3V power supply
  • 12MHz and 25Mhz clock input from either crystal or oscillator source
  • Integrates on-chip power-on reset circuit
  • 80-pin TQFP RoHS compliant package
  • Operating temperature range: 0°C to 70°C

 Block Diagram


 Selection Guide


 Development Board

AX88172A Demo Board  Available
 This is an AX88172A USB dongle adapter for users to verify AX88172A function on any platform that supports USB interface

Technical Documentation

 Product Brief, Product Introduction and Datasheet

AX88172A Product Brief311.9 KB2007-12-17
AX88x72A Product Introduction 796.2 KBv1.112013-12-19
AX88172A Datasheet 1.9 MBv1.082011-12-13
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 Reference Manuals and User Guides

AX88x72A EEPROM/Manufacture User Guide  
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AX88172A MAC-to-MAC Application Note  
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AX88172A Reliability Report 108.8 KB2007-06-14
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AX88x72A Performance Test Report   
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Hardware Design Documentation

 Reference Schematics

AX88172A Demo Board(USB to Rev-MII) Reference Schematic 292.3 KBv1.322009-05-18
AX88172A ExpressCard to Rev-MII Reference Schematic 233.1 KBv1.302009-05-18
AX88x72A PHY-to-PHY Connection Reference Circuit   
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 Bill of Materials, Application Notes and Layout Guides

AX88172A Demo Board BOM File 36.6 KBv1.312008-12-11
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AX88172A USB-to-LAN Applications Design Note 805.2 KBv2.022014-06-10
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 PCB Layout, Gerber and IBIS Model

1. You can open the gerber files by running ORACLE's AutoVue Evaluation Revision tool (30 days evaluation date). Please visit ORACLE's web site ( for more details.
2. You can open the PowerPCB PCB layout file by running Mentor Graphics PADS Layout Product Evaluation Software (No time limitation but with limited function). Please visit Mentor Graphics' web site ( for more details.
AX88172A Demo Board PCB Layout File (PowerPCB) 264 KB2007-12-05
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AX88172A Demo Board Gerber Files 247.3 KB2008-01-21
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AX88172A IBIS Model 843.5 KB2008-05-15
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Windows SROM Programming Tool
Please contact ASIX Sales to get zip password
1.8 MBv1.31.02019-04-24
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Windows Production Test Tool
Please contact ASIX Sales to get zip password
1.8 MBv1.15.02019-08-02
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Linux SROM Programming Tool   
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WinCE SROM Programming Tool   
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All these AX88172A drivers are qualified with ASIX AX88172A demo board. If these drivers could not work with your AX88172A device, please contact your AX88172A device manufacturer to get a correct driver.
Driver TypeRevision Release DateDescriptionFile Size
Linux kernel 3.x/2.6.x Driver v1.4.02013-04-19 For Android 1.x/2.x/3.x/4.x, Linux kernel 2.6.14 and later21.6 KB
Windows 7 32-bit Driver v1.12.0.2 2010-06-02 For 32-bit x86 CPU platform, WHQL certified1.4 MB
Windows 7 64-bit Driver v1.14.0.22010-06-02 For 64-bit x86 CPU platform, WHQL certified1.6 MB
Windows 7 32-bit/64-bit Drivers Setup Program v1.0.0.02010-06-22 For 32-bit/64-bit x86 CPU platform , WHQL certified11.7 MB
Windows Vista 32-bit Driver v1.8.0.52010-06-02 For 32-bit x86 CPU platform, WHQL certified1.1 MB
Windows Vista 64-bit Driver v1.10.0.52010-06-02 For 64-bit x86 CPU platform, WHQL certified1.4 MB
Windows Vista 32-bit/64-bit WHQL drivers setup program v1.0.0.02010-08-06 For 32-bit/64-bit x86 CPU platform , WHQL certified11.2 MB
Windows XP/2K 32-bit Driver v1.4.0.62010-06-02 For 32-bit x86 CPU platform, WHQL certified32.3 KB
Windows XP/2003 64-bit Driver v1.6.0.62010-08-05 For 64-bit x86 CPU platform, WHQL certified 40.6 KB
Windows XP 32-bit/64-bit Drivers Setup Program v1.0.0.02010-08-06 For 32-bit/64-bit x86 CPU platform , WHQL certified8.8 MB


click here for more AX88172A FAQs....
Q0001: Where can I obtain the the latest AX88172A drivers?
A0001: Please visit the AX88172A Driver Download web page ( for details.

Note: The AX88172A drivers are released for users to evaluate some basic network functions of the AX88172A demo board. Users should contact ASIX's Sales ( for further driver support on your AX88172A target applications.

Q0002: Why don't ASIX's AX88172A standard drivers work with my AX88172A device?
A0002: All ASIX's AX88172A standard drivers are qualified with ASIX's AX88172A demo board with AX88172A default Vendor ID (0B95h) and Product ID (172Ah). Some of AX88172A manufacturers have their own Vendor ID and Product ID on their AX88172A applications. In this case, ASIX's AX88172A standard drivers will not work with your AX88172A device. Please contact the technical support of your AX88172A device manufacturer to obtain a proper driver.

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