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1.1     ! root        1: .\" Copyright (c) 1986 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" Redistribution and use in source and binary forms are permitted provided
        !             5: .\" that: (1) source distributions retain this entire copyright notice and
        !             6: .\" comment, and (2) distributions including binaries display the following
        !             7: .\" acknowledgement:  ``This product includes software developed by the
        !             8: .\" University of California, Berkeley and its contributors'' in the
        !             9: .\" documentation or other materials provided with the distribution and in
        !            10: .\" all advertising materials mentioning features or use of this software.
        !            11: .\" Neither the name of the University nor the names of its contributors may
        !            12: .\" be used to endorse or promote products derived from this software without
        !            13: .\" specific prior written permission.
        !            14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            15: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            16: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17: .\"
        !            18: .\"    @(#)ace.4       6.4 (Berkeley) 6/23/90
        !            19: .\"
        !            20: .TH ACE 4 "June 23, 1990"
        !            21: .UC 5
        !            22: .SH NAME
        !            23: ace \- ACC 10 Mb/s Ethernet interface
        !            24: .SH SYNOPSIS
        !            25: .B "device ace0 at vba? csr 0xffff0000 flags 0xfff80000 vector acecint acerint"
        !            26: .SH DESCRIPTION
        !            27: The
        !            28: .I ace
        !            29: interface provides access to a 10 Mb/s Ethernet network through
        !            30: an ACC controller.
        !            31: .PP
        !            32: The hardware has 32 kilobytes of dual-ported memory on the VERSAbus. 
        !            33: This memory
        !            34: is used for internal buffering by the board, and the interface code reads
        !            35: the buffer contents directly through the VERSAbus.
        !            36: The address of this memory is given in the \fIflags\fP field
        !            37: in the configuration file.
        !            38: .PP
        !            39: Each of the host's network addresses
        !            40: is specified at boot time with an SIOCSIFADDR
        !            41: ioctl.  The
        !            42: .I ace
        !            43: interface employs the address resolution protocol described in
        !            44: .IR arp (4)
        !            45: to dynamically map between Internet and Ethernet addresses on the local
        !            46: network.
        !            47: .PP
        !            48: The interface normally tries to use a ``trailer'' encapsulation
        !            49: to minimize copying data on input and output.
        !            50: The use of trailers is negotiated with ARP.
        !            51: This negotiation may be disabled, on a per-interface basis,
        !            52: by setting the IFF_NOTRAILERS
        !            53: flag with an SIOCSIFFLAGS ioctl.
        !            54: .PP
        !            55: The device implements an exponential backoff algorithm
        !            56: when notified of a collision on the cable.  This algorithm utilizes
        !            57: a table of random numbers setup by the system at boot time.
        !            58: The delay is done in the controller.
        !            59: .SH DIAGNOSTICS
        !            60: .BR "ace%d: stray xmit interrupt, xnct %d" .
        !            61: An unexpected transmission complete interrupt was received;
        !            62: the interrupt is ignored.
        !            63: .BR "ace%d: can't handle af%d" .
        !            64: The interface was handed
        !            65: a message with addresses formatted in an unsuitable address
        !            66: family; the packet was dropped.
        !            67: .SH SEE ALSO
        !            68: intro(4), inet(4), arp(4)
        !            69: .SH BUGS
        !            70: The hardware is not capable of talking to itself.  The software
        !            71: implements local sending and broadcast by sending such packets to the
        !            72: loop interface.  This is a kludge.
        !            73: .PP
        !            74: The device doesn't autoconfigure its interrupt vector; it is set
        !            75: at 0x90 + eight times the unit number.

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