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AXE(4)                   BSD Kernel Interfaces Manual                   AXE(4)

NAME
     axe -- ASIX Electronics AX88172 USB Ethernet driver

SYNOPSIS
     device ehci
     device uhci
     device ohci
     device usb
     device miibus
     device axe

DESCRIPTION
     The axe driver provides support for USB Ethernet adapters based on the
     ASIX Electronics AX88172 USB 2.0 chipset.

     The AX88172 is a USB 2.0 device which contains a 10/100 Ethernet MAC with
     MII interface and is designed to work with both Ethernet and HomePNA
     transceivers.  The AX88172 will operate with both USB 1.x and USB 2.0
     controllers, however performance with 1.x controllers will be limited
     since the USB 1.x standard specifies a maximum transfer speed of 12Mbps.
     Users with USB 1.x controllers should therefore not expect to actually
     achieve 100Mbps speeds with these devices.

     The AX88172 supports a 64-bit multicast hash table, single perfect filter
     entry for the station address, all-multicast mode and promiscuous mode.
     Packets are received and transmitted over separate USB bulk transfer end-
     points.

     The axe driver supports the following media types:

     autoselect   Enable autoselection of the media type and options.  The
                  user can manually override the autoselected mode by adding
                  media options to the /etc/rc.conf file.

     10baseT/UTP  Set 10Mbps operation.  The mediaopt option can also be used
                  to enable full-duplex operation.  Not specifying full-duplex
                  implies half-duplex mode.

     100baseTX    Set 100Mbps (Fast Ethernet) operation.  The mediaopt option
                  can also be used to enable full-duplex operation.  Not spec-
                  ifying full-duplex implies half-duplex mode.

     The axe driver supports the following media options:

     full-duplex  Force full duplex operation.  The interface will operate in
                  half duplex mode if this media option is not specified.

     For more information on configuring this device, see ifconfig(8).

HARDWARE
     The axe driver supports ASIX Electronics AX88172 based USB Ethernet
     adapters including:

     o   Buffalo (Melco Inc.) LUA-U2-KTX
     o   D-Link DUBE100
     o   LinkSys USB200M
     o   Netgear FA120
     o   System TALKS Inc. SGC-X2UL

DIAGNOSTICS
     axe%d: watchdog timeout  A packet was queued for transmission and a
     transmit command was issued, however the device failed to acknowledge the
     transmission before a timeout expired.

     axe%d: no memory for rx list  The driver failed to allocate an mbuf for
     the receiver ring.

SEE ALSO
     arp(4), miibus(4), netintro(4), ng_ether(4), ifconfig(8)

     ASIX AX88172 data sheet, http://www.asix.com.tw.

HISTORY
     The axe device driver first appeared in FreeBSD 5.0.

AUTHORS
     The axe driver was written by Bill Paul <wpaulATwindriver.com>.

BSD                             August 25, 2004                            BSD