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MIIBUS(4)		 BSD Kernel Interfaces Manual		     MIIBUS(4)

     miibus -- IEEE 802.3 Media	Independent Interface network bus

     For most network interface	cards (NIC):
     device miibus

     The miibus	driver provides	an interconnection between the Media Access
     Control (MAC) sublayer, the Physical Layer	entities (PHY),	Station	Man-
     agement (STA) entities, and the PHY Layer as defined by the IEEE 802.3

     The miibus	layer allows network device drivers to share common support
     code for various external PHY devices.  Most 10/100 network interface
     cards either use an MII transceiver or have built-in transceivers that
     can be programmed using an	MII interface.	The miibus driver currently
     handles all of the	media detection, selection, and	reporting using	the
     ifmedia interface.	 A generic driver has been included for	all PHYs that
     are not handled by	a specific driver, this	is possible because all	10/100
     PHYs implement the	same general register set along	with their vendor spe-
     cific register set.

     The following network device drivers use the miibus interface:

     an(4)   Aironet 4500/4800 802.11 wireless NICs
     aue(4)  ADMtek USB	Ethernet
     awi(4)  BayStack 660 and others
     bge(4)  Broadcom BCM570xx Gigabit Ethernet
     cue(4)  CATC USB Ethernet
     dc(4)   DEC/Intel 21143 and various workalikes
     ed(4)   NE[12]000,	SMC Ultra, 3c503, DS8390 cards
     fxp(4)  Intel EtherExpress	PRO/100B (82557, 82558)
     gem(4)  Sun ERI, Sun GEM and Apple	GMAC Ethernet
     hme(4)  Sun HME Ethernet
     kue(4)  Kawasaki LSI USB Ethernet
     my(4)   Myson Technologies	PCI Ethernet adaptors
     pcn(4)  AMD Am79C97x PCI 10/100
     rl(4)   RealTek 8129/8139
     rue(4)  RealTek RTL8150 USB To Fast Ethernet
     sf(4)   Adaptec AIC-6915
     sis(4)  Silicon Integrated	Systems	SiS 900/SiS 7016
     ste(4)  Sundance ST201 (D-Link DFE-550TX)
     tl(4)   Texas Instruments ThunderLAN
     tx(4)   SMC EtherPower II (83c170)
     vr(4)   VIA Rhine,	Rhine II
     wb(4)   Winbond W89C840F
     xl(4)   3Com 3c90x

     The implementation	of miibus was originally intended to have similar API
     interfaces	to BSD/OS 3.0 and NetBSD, but as a result are not well behaved
     newbus device drivers.

     an(4), arp(4), aue(4), awi(4), bge(4), cue(4), dc(4), ed(4), fxp(4),
     gem(4), hme(4), kue(4), my(4), netintro(4), pcn(4), rl(4),	rue(4),	sf(4),
     sis(4), ste(4), tl(4), tx(4), vr(4), wb(4), xl(4)

     More information on MII can be found in the IEEE 802.3 Standard.

     The miibus	driver first appeared in FreeBSD 3.3.

     This manual page was written by Tom Rhodes	<>.

BSD			       February	15, 2003			   BSD


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