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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
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14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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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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