TXP(4)                    OpenBSD Programmer's Manual                   TXP(4)

NAME
     txp - 3Com 3XP Typhoon/Sidewinder (3CR990) Ethernet interface

SYNOPSIS
     txp* at pci? dev ? function ?

DESCRIPTION
     The txp interface provides access to the 10Mb/s and 100Mb/s Ethernet net-
     works via the 3Com Typhoon/Sidewinder chipset.  This driver supports the
     following cards:

           o   3Com 3CR990-TX-95
           o   3Com 3CR990-TX-97
           o   3Com 3CR990SVR95
           o   3Com 3CR990SVR97

     Basic Ethernet functions are provided as well as support for vlan(4) tag
     removal and insertion assistance.  There is no support currently for
     ip(4), tcp(4), and udp(4) checksum offloading, tcp(4) segmentation, nor
     ipsec(4) acceleration.

     Each of the host's network addresses is specified at boot time with an
     SIOCSIFADDR ioctl(2). The txp interface employs the address resolution
     protocol described in arp(4) to dynamically map between Internet and Eth-
     ernet addresses on the local network.

     When a txp interface is brought up, by default, it will attempt to auto-
     negotiate the link speed and duplex mode.  The speeds, in order of at-
     tempt, are: 100Mb/s Full Duplex, 100Mb/s Half Duplex, 10 Mb/s Full Du-
     plex, and 10 Mb/s Half Duplex.

     The txp supports several media types, which are selected via the ifcon-
     fig(8) command.  The supported media types are:

           media autoselect
                           Attempt to autoselect the media type (default)

           media 100baseTX mediaopt full-duplex
                           Use 100baseTX, full duplex

           media 100baseTX [mediaopt half-duplex]
                           Use 100baseTX, half duplex

           media 10baseT mediaopt full-duplex
                           Use 10baseT, full duplex

           media 10baseT [mediaopt half-duplex]
                           Use 10baseT, half duplex

SEE ALSO
     arp(4), ifmedia(4), inet(4), intro(4), ip(4), tcp(4), udp(4), vlan(4),
     ifconfig(8)

HISTORY
     The txp driver first appeared in OpenBSD 2.9.

OpenBSD 2.9                     April 15, 2001                               1
