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

     axe -- ASIX Electronics AX88172 USB Ethernet driver

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

     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-

     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).

     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

     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.

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

     ASIX AX88172 data sheet,

     The axe device driver first appeared in FreeBSD 5.0.

     The axe driver was	written	by Bill	Paul <>.

BSD				August 25, 2004				   BSD


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