Return to ace.4 CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / man / man4 / tahoe

Annotation of 43BSDTahoe/man/man4/tahoe/ace.4, revision 1.1.1.1

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.

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.