.\"	$OpenBSD: ex.4,v 1.2 1996/03/29 10:16:51 niklas Exp $
.\"	$NetBSD: ex.4,v 1.3 1996/03/03 17:13:33 thorpej Exp $
.\"
.\" Copyright (c) 1986, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\"     from: @(#)ex.4	6.6 (Berkeley) 3/27/91
.\"
.Dd March 27, 1991
.Dt EX 4 vax
.Os BSD 4.2
.Sh NAME
.Nm ex
.Nd Excelan 10 Mb/s Ethernet interface
.Sh SYNOPSIS
.Cd "device ex0 at uba0 csr 164000 vector excdint"
.Sh DESCRIPTION
The
.Nm ex
interface provides access to a 10 Mb/s Ethernet network through
an Excelan controller used as a link-layer interface.
.Pp
Each of the host's network addresses
is specified at boot time with an
.Dv SIOCSIFADDR
.Xr ioctl 2 .
The
.Nm ex
interface employs the address resolution protocol described in
.Xr arp 4
to dynamically map between Internet and Ethernet addresses on the local
network.
.Pp
The interface normally tries to use a
.Dq trailer
encapsulation
to minimize copying data on input and output.
The use of trailers is negotiated with
.Tn ARP .
This negotiation may be disabled, on a per-interface basis,
by setting the
.Dv IFF_NOTRAILERS
flag with an
.Dv SIOCSIFFLAGS
.Xr ioctl .
.Sh DIAGNOSTICS
.Bl -diag
.It "ex%d: HW %c.%c, NX %c.%c, hardware address %s."
This provides firmware revisions levels, and is expected during
autoconfiguration.
.Pp
.It ex%d: can't initialize.
There was a failure in allocating unibus resources for the device.
.Pp
.It "ex%d: configuration failed; cc = %x."
The hardware indicated an error when trying to initalize itself.
The error code returned is described at length in the device
Reference Manual.
.Pp
.It ex%d: receive error %b.
The hardware indicated an error
in reading a packet from the cable.
Specific Error bits are provided
.Pp
.It ex%d: transmit error %b.
The hardware indicated an error
in transmitting a packet to the cable or an illegally sized packet.
Specific Error bits are provided
.Pp
.It ex%d: can't handle af%d.
The interface was handed
a message with addresses formatted in an unsuitable address
family; the packet was dropped.
.El
.Sh SEE ALSO
.Xr netintro 4 ,
.Xr inet 4 ,
.Xr arp 4
.Sh HISTORY
The
.Nm
driver appeared in
.Bx 4.3 .