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Annotation of 43BSDTahoe/man/man4/tahoe/ace.4, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1986 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)ace.4       6.2 (Berkeley) 6/30/87
        !             6: .\"
        !             7: .TH ACE 4 "May 16, 1986"
        !             8: .UC 5
        !             9: .SH NAME
        !            10: ace \- ACC 10 Mb/s Ethernet interface
        !            11: .SH SYNOPSIS
        !            12: .B "device ace0 at vba? csr 0xffff0000 flags 0xfff80000 vector acecint acerint"
        !            13: .SH DESCRIPTION
        !            14: The
        !            15: .I ace
        !            16: interface provides access to a 10 Mb/s Ethernet network through
        !            17: an ACC controller.
        !            18: .PP
        !            19: The hardware has 32 kilobytes of dual-ported memory on the VERSAbus. 
        !            20: This memory
        !            21: is used for internal buffering by the board, and the interface code reads
        !            22: the buffer contents directly through the VERSAbus.
        !            23: The address of this memory is given in the \fIflags\fP field
        !            24: in the configuration file.
        !            25: .PP
        !            26: Each of the host's network addresses
        !            27: is specified at boot time with an SIOCSIFADDR
        !            28: ioctl.  The
        !            29: .I ace
        !            30: interface employs the address resolution protocol described in
        !            31: .IR arp (4P)
        !            32: to dynamically map between Internet and Ethernet addresses on the local
        !            33: network.
        !            34: .PP
        !            35: The interface normally tries to use a ``trailer'' encapsulation
        !            36: to minimize copying data on input and output.
        !            37: The use of trailers is negotiated with ARP.
        !            38: This negotiation may be disabled, on a per-interface basis,
        !            39: by setting the IFF_NOTRAILERS
        !            40: flag with an SIOCSIFFLAGS ioctl.
        !            41: .PP
        !            42: The device implements an exponential backoff algorithm
        !            43: when notified of a collision on the cable.  This algorithm utilizes
        !            44: a table of random numbers setup by the system at boot time.
        !            45: The delay is done in the controller.
        !            46: .SH DIAGNOSTICS
        !            47: .BR "ace%d: stray xmit interrupt, xnct %d" .
        !            48: An unexpected transmission complete interrupt was received;
        !            49: the interrupt is ignored.
        !            50: .BR "ace%d: can't handle af%d" .
        !            51: The interface was handed
        !            52: a message with addresses formatted in an unsuitable address
        !            53: family; the packet was dropped.
        !            54: .SH SEE ALSO
        !            55: intro(4N), inet(4F), arp(4P)
        !            56: .SH BUGS
        !            57: The hardware is not capable of talking to itself.  The software
        !            58: implements local sending and broadcast by sending such packets to the
        !            59: loop interface.  This is a kludge.
        !            60: .PP
        !            61: The device doesn't autoconfigure its interrupt vector; it is set
        !            62: at 0x90 + eight times the unit number.

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