.\"	$NetBSD: mii.4,v 1.6 1999/09/09 12:38:43 augustss Exp $
.\"
.\" Copyright (c) 1998 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
.\" NASA Ames Research Center.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"        This product includes software developed by the NetBSD
.\"        Foundation, Inc. and its contributors.
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.\"    contributors may be used to endorse or promote products derived
.\"    from this software without specific prior written permission.
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.Dd November 3, 1998
.Dt MII 4
.Os
.Sh NAME
.Nm mii
.Nd IEEE 802.3 Media Independent Interface
.Sh SYNOPSIS
.Cd "exphy*  at mii? phy ?		# 3Com internal PHYs"
.Cd "icsphy* at mii? phy ?		# Integrated Circuit Systems ICS1890 PHYs"
.Cd "inphy*  at mii? phy ?		# Intel 82555 PHYs"
.Cd "iophy*  at mii? phy ?		# Intel 82553 PHYs"
.Cd "lxtphy* at mii? phy ?		# Level One LXT-970 PHYs"
.Cd "nsphy*  at mii? phy ?		# National Semiconductor NS83840 PHYs"
.Cd "qsphy*  at mii? phy ?		# Quality Semiconductor QS6612 PHYs"
.Cd "sqphy*  at mii? phy ?		# Seeq 80220/80221/80223 PHYs"
.Cd "tlphy*  at mii? phy ?		# ThunderLAN internal PHYs"
.Cd "tqphy*  at mii? phy ?		# TSC Semiconductor 78Q2120 PHYs"
.Cd "ukphy*  at mii? phy ?		# Generic/unknown PHYs"
.Sh DESCRIPTION
Media Independent Interface is an IEEE standard serial bus for
connecting MACs (network controllers) to PHYs (physical media
interfaces).  The
.Nm
layer allows network device drivers to share support code for
various PHY models, and allows unused support for PHYs which
are not present in a system to be removed from the kernel.
.Pp
Network device drivers which use the
.Nm
layer carry the
.Dq mii
autoconfiguration attribute.  This allows kernel configuration
files to simply specify PHYs as described above in the synopsis.
.Pp
The following is an example of the messages displayed when a network
interface with an attached PHY is detected by the kernel:
.Bd -literal -offset indent
epic0 at pci0 dev 12 function 0: SMC EPIC/100 Fast Ethernet
epic0: interrupting at kn20aa irq 4
epic0: SMC9432TX, Ethernet address 00:e0:29:07:17:c4
qsphy0 at epic0 phy 3: QS6612 10/100 media interface, rev. 1
qsphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
.Ed
.Pp
All PHY drivers display the media types supported by the PHY when it
is detected by the kernel.  These media types are valid media keywords
for use with the
.Xr ifconfig 8
program.
.Sh SEE ALSO
.Xr exphy 4 ,
.Xr icsphy 4 ,
.Xr ifmedia 4 ,
.Xr inphy 4 ,
.Xr iophy 4 ,
.Xr intro 4 ,
.Xr lxtphy 4 ,
.Xr nsphy 4 ,
.Xr qsphy 4 ,
.Xr sqphy 4 ,
.Xr tlphy 4 ,
.Xr tqphy 4 ,
.Xr ukphy 4 ,
.Xr ifconfig 8