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     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 Management (STA) entities, and the PHY
     Layer as defined by the IEEE 802.3 Standard.

     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 specific register set.

     The following network device drivers use the miibus interface:

     ae(4)   Attansic/Atheros L2 Fast Ethernet
     age(4)  Attansic/Atheros L1 Gigabit Ethernet
     alc(4)  Atheros AR8131/AR8132 PCIe Ethernet
     ale(4)  Atheros AR8121/AR8113/AR8114 PCIe Ethernet
     aue(4)  ADMtek USB Ethernet
     axe(4)  ASIX Electronics AX88172 USB Ethernet
             ASIX Electronics AX88178A/AX88179 USB Ethernet
     bce(4)  Broadcom NetXtreme II Gigabit Ethernet
     bfe(4)  Broadcom BCM4401 Ethernet
     bge(4)  Broadcom BCM570xx Gigabit Ethernet
     cas(4)  Sun Cassini/Cassini+ and National Semiconductor DP83065 Saturn
     dc(4)   DEC/Intel 21143 and various workalikes
     ed(4)   NE[12]000, SMC Ultra, 3c503, DS8390 cards
     et(4)   Agere ET1310 Gigabit Ethernet
     fxp(4)  Intel EtherExpress PRO/100B
     gem(4)  Sun ERI, Sun GEM and Apple GMAC Ethernet
     hme(4)  Sun HME Ethernet
     jme(4)  JMicron JMC250 Gigabit/JMC260 Fast Ethernet
     lge(4)  Level 1 LXT1001 NetCellerator Gigabit Ethernet
     msk(4)  Marvell/SysKonnect Yukon II Gigabit Ethernet
     nfe(4)  NVIDIA nForce MCP Networking Adapter
     nge(4)  National Semiconductor DP83820/DP83821 Gigabit Ethernet
     pcn(4)  AMD Am79C97x PCI 10/100
     re(4)   RealTek 8139C+/8169/8169S/8110S
     rl(4)   RealTek 8129/8139
     rue(4)  RealTek RTL8150 USB To Fast Ethernet
     sf(4)   Adaptec AIC-6915
     sge(4)  Silicon Integrated Systems SiS190/191 Ethernet
     sis(4)  Silicon Integrated Systems SiS 900/SiS 7016
     sk(4)   SysKonnect SK-984x and SK-982x Gigabit Ethernet
             SMSC LAN9xxx USB Fast Ethernet
     ste(4)  Sundance ST201 (D-Link DFE-550TX)
             Sundance/Tamarack TC9021 Gigabit Ethernet
     tl(4)   Texas Instruments ThunderLAN
     tx(4)   SMC EtherPower II (83c170)
             Davicom DM9601 USB Ethernet
     ure(4)  RealTek RTL8152 USB To Fast Ethernet
     vge(4)  VIA VT612x PCI Gigabit Ethernet
     vr(4)   VIA Rhine, Rhine II
     vte(4)  DM&P Vortex86 RDC R6040 Fast Ethernet
     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.


     ae(4), age(4), alc(4), ale(4), arp(4), aue(4), axe(4), axge(4), bce(4), bfe(4), bge(4),
     cas(4), dc(4), ed(4), et(4), fxp(4), gem(4), hme(4), jme(4), lge(4), msk(4), netintro(4),
     nfe(4), nge(4), pcn(4), re(4), rgephy(4), rl(4), rue(4), sf(4), sge(4), sis(4), sk(4),
     smsc(4), ste(4), stge(4), tl(4), tx(4), udav(4), ure(4), vge(4), vr(4), vte(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 <>.