TLP(4) BSD Kernel Interfaces Manual TLP(4)NAMEtlp — DECchip 21x4x and clone Ethernet interfaces device driver
SYNOPSIS
tlp* at eisa? slot ?
tlp* at pci? dev ? function ?
tlp* at cardbus? function ?
Configuration of PHYs may also be necessary. See mii(4).
DESCRIPTION
The tlp device driver supports Ethernet interfaces based on the DECchip
21x4x “Tulip” (DEC fourth generation Ethernet controller) and a variety
of clone chips. The Tulip has several features designed to make it flex‐
ible and reduce CPU usage:
· Flexible receive filter allowing for 16 perfect matches, 16
perfect inverse matches, 512-bit hash table plus 1 perfect
match, or 512-bit hash table only.
· Uniform transmit descriptor architecture, configurable as a
ring (allowing 2 buffers per descriptor) or a chain (allowing 1
buffer per descriptor).
· Uniform receive descriptor architecture, configurable as a ring
(allowing 2 buffers per descriptor) or a chain (allowing 1 buf‐
fer per descriptor).
· Interrupt pacing; host may choose whether or not completion of
processing of an individual descriptor causes an interrupt.
· Support for jumbo packets (by disabling transmit and receive
watchdog timers).
· A patented transmit backoff algorithm which solves the Ethernet
capture effect problem.
· Flexible bus modes to optimize DMA cycles for various cache
sizes and bus implementations.
· Programmable transmit FIFO drain threshold to allow DMA overlap
and reduce time to transmit.
· Flexible media attachment facilities.
The tlp driver supports the following chips:
· DECchip 21040 -- This is the original Tulip Ethernet chip. It
supports 10Mb/s speeds over a built-in serial interface. The
serial interface has support for 10BASE-T and AUI media. The
AUI port may be connected to 10BASE5 AUI or 10BASE2 BNC connec‐
tors, or both, selected by a gang jumper on the board. Some
boards connect the BNC connector to an external serial inter‐
face. The driver has no way of knowing this, but the external
serial interface may be selected with the “manual” media set‐
ting.
Boards that include this chip include the DEC DE-435, on-board
Ethernet on many DEC AlphaStation and AlphaServer systems, ZNYX
ZX312, ZX312T, ZX314, ZX315, SMC 8432, SMC 8434, ACCTON EN1203,
and some Cogent multi-port boards.
This chip also appears on the DEC DE-425 EISA Ethernet board.
This board is a DECchip 21040 and a PLX PCI glue chip, which
provides the interface to the EISA bus, and special address
decoding so that the PCI configuration space registers of the
21040 are accessible in normal EISA I/O space.
The very first versions of this chip were labeled “DC1003” and
“DC1003 Prototype”.
· DECchip 21041 -- This is the second chip in the Tulip family,
dubbed “Tulip Plus”. It supports 10Mb/s speeds over a built-in
serial interface. The serial interface has support for 10BASE-
T, 10BASE5 AUI, and 10BASE2 BNC media. The serial interface
also includes support for IEEE 802.3u NWay over the 10BASE-T
interface, for negotiation of duplex mode with the link part‐
ner.
Boards that include this chip include the DEC DE-450 and some
SMC boards.
· DECchip 21140 and 21140A -- This is the third chip in the Tulip
family, dubbed “FasterNet”. It supports 10Mb/s speeds with a
built-in 10BASE-T encoder/decoder, and 100Mb/s speeds with a
built-in 100BASE PCS function. Support for 100BASE-TX and
100BASE-T4 is provided by a built-in scrambler. Support for
100BASE-FX is possible with an appropriate PMD connected to the
100BASE PCS. The 21140 and 21140A also support 10Mb/s and
100Mb/s speeds over an MII interface connected to one or more
PHYs.
The 21140 and 21140A include a general purpose I/O facility,
which may be used to toggle relays on the board. This facility
is often used to reset individual board modules (e.g. the MII
bus), select the output path of the chip (e.g. connect the UTP
port on the board to the PHY, built-in 10BASE-T ENDEC, or
built-in 100BASE-T PMD), or detect link status (by reading an
output pin on the 100BASE-T magnetics).
The 21140 and 21140A use a standardized data structure located
in the SROM to describe how the chip should be programmed for
various media settings, including the internal chip pathway,
and GPIO settings. If the SROM data is not in the standardized
format, the device driver must know specific programming infor‐
mation for that particular board.
Boards that include the 21140 and 21140A include the DEC EB140,
DE-500XA, DE-500AA, Asante EtherFast, DaynaPORT BlueStreak,
Cogent EM100TX, EM110TX, EM440T4 multi-port, Kingston KNE100TX,
older versions of the NetGear FA-310TX, SMC 9332, SMC 9334,
ZNYX ZX34x multi-port, and Adaptec ANA-6944A/TX multi-port.
· DECchip 21142 and 21143 -- These are the fourth and fifth chips
in the Tulip family. While they have two different chip num‐
bers, the 21142 and 21143 are essentially identical, with only
minor differences related to available technology at time of
manufacture. Both chips include support for 10Mb/s speeds over
a built-in serial interface, and support for 10Mb/s and 100Mb/s
speeds over an MII interface connected to one or more PHYs.
The serial interface includes support for 10BASE-T, 10BASE5
AUI, and 10BASE2 BNC media, as well as support for IEEE 802.3u
NWay over the 10BASE-T interface, for negotiation of duplex
mode and link speed with the link partner.
The 21143 adds support for 100Mb/s speeds with a built-in PCS
function. Support for 100BASE-TX and 100BASE-T4 is provided by
a built-in scrambler. Support for 100BASE-FX is possible with
an appropriate PMD connected to the 100BASE PCS.
The 21142 and 21143 include a general purpose I/O facility,
which may be used to toggle relays on the board. This facility
is often used to reset individual board modules (e.g. the MII
bus), select the output path of the chip (e.g. connect the UTP
port on the board to the PHY, built-in serial interface, or
built-in 100BASE-T PMD), or detect link status (by reading an
output pin on the 100BASE-T magnetics).
The 21142 and 21143 use a standardized data structure located
in the SROM to describe how the chip should be programmed for
various media settings, including the internal chip pathway,
and GPIO settings. If the SROM data is not in the standardized
format, the device driver must know specific programming infor‐
mation for that particular board.
Boards that include the 21142 include the DEC EB142, and on-
board Ethernet on the Digital Personal Workstation (Alpha
“Miata” and x86 models) and several Digital PCs.
Boards that include the 21143 include the DEC EB143, DE-500BA,
several commonly-available 100BASE-FX boards, the NetGear
FA-510c CardBus card, and the Compu-Shack FASTline-II PCI
boards.
· Lite-On 82C168 and 82C169 -- These chips, dubbed “PNIC”, were
some of the first commonly-available Tulip clones, appearing on
low-cost boards when it became difficult for board vendors to
obtain DECchip 21140A parts. They include support for 10Mb/s
speeds over a built-in 10BASE-T encoder/decoder, and 100Mb/s
speeds over a built-in PCS function. Support for 100BASE-TX
and 100BASE-T4 is provided by a built-in scrambler and trans‐
ceiver module. The transceiver module also includes support
for NWay, for negotiating duplex mode and link speed with the
link partner. These chips also include support for 10Mb/s and
100Mb/s speeds over and MII interface connected to one or more
PHYs.
These chips also include a GPIO facility, although it is pro‐
grammed differently than the 21140's.
Unfortunately, these chips seem to be plagued by two unfortu‐
nate hardware bugs: in some situations, the receive logic
incorrectly dumps the entire transmit FIFO into the receive
chain, rather than a single Ethernet frame, and the DMA engines
appear to be substandard; they must be run in store-and-forward
mode, and occasionally fail to upload the filter setup frame.
Boards that include the 82C168 and 82C169 include the newer
NetGear FA-310TX, the Kingston KNE110TX, and some older LinkSys
LNE100TX boards.
· Macronix 98713, 98713A, 98715, 98715A, and 98725 -- Of all the
clones, these chips, dubbed “PMAC”, are the best. They are
very close clones of their respective originals, with the
exception of some slight programming magic necessary to work
around an apparent hardware bug.
The 98713 is a DECchip 21140A clone. It includes all of the
21140A's features, and uses the same SROM data format.
The 98713A is a half-clone of the DECchip 21143. It has sup‐
port for serial, PCS, and MII media. The serial interface has
a built-in NWay function. However, the 98713A does not have a
GPIO facility, and, as a result, usually does not use the same
SROM format as the 21143 (no need for GPIO programming informa‐
tion).
The 98715, 98715A, and 98725 are more 21143-like, but lack the
GPIO facility and MII. These chips also support ACPI power
management.
Boards that include the Macronix chips include some SVEC
boards, some SOHOWare boards, and the Compex RL100TX.
· Lite-On/Macronix 82C115 -- This chip, dubbed the “PNIC-II”, was
co-designed by Lite-On and Macronix. It is almost identical to
the Macronix 98725, with a few exceptions: it has Wake-On-LAN
support, uses a 128-bit receive filter hash table, and supports
IEEE 802.3x flow control.
Boards that include the 82C115 include the newer LinkSys (Ver‐
sion 2) LNE100TX boards.
· Winbond 89C840F -- This chip is a very low-end barely-a-clone
of the 21140. It supports 10Mb/s and 100Mb/s speeds over an
MII interface only, and has several programming differences
from the 21140.
The receive filter is completely different: it supports only a
single perfect match, and has only a 64-bit multicast filter
hash table. The receive filter is programmed using special
registers rather than the standard Tulip setup frame.
This chip is also plagued by a terrible DMA engine. The chip
must be run in store-and-forward mode or it will often transmit
garbage onto the wire.
Interrupt pacing is also less flexible on the chip.
Boards that include the 89C940F include the Complex RL100ATX,
some Unicom 10/100 boards, and several no-name 10/100 boards.
· ADMtek AL981 -- This chip is a low cost, single-chip (sans mag‐
netics) 10/100 Ethernet implementation. It supports 10Mb/s and
100Mb/s speeds over an internal PHY. There is no generic MII
bus; instead the IEEE 802.3u-compliant PHY is accessed via spe‐
cial registers on the chip. This chip also supports Wake-On-
LAN and IEEE 802.3x flow control.
The receive filter on the AL981 is completely different: it
supports only a single perfect match, and has only a 64-bit
multicast filter hash table. The receive filter is programmed
using special registers rather than the standard Tulip setup
frame.
This chip also supports ACPI power management.
A list of boards which include the AL981 is not yet available.
Support for the AL981 has not yet been tested. If you have a
board which uses this chip, please contact the author (listed
below).
· Xircom X3201-3 -- This chip is a CardBus 21143 clone with a
loosely-coupled modem function (the modem is on a separate
CardBus function, but the MAC portion includes a shadow of its
interrupt status). Media is provided by an IEEE 802.3u-compli‐
ant PHY connected to an MII interface. These chips have no
SROM; instead, the MAC address must be obtained from the card's
CIS information. Unlike most other Tulip-like chips, the
X3201-3 requires that transmit buffers be aligned to a 4-byte
boundary. This virtually ensures that each outgoing packet
must be copied into an aligned buffer, since the Ethernet
header is 14 bytes long.
This chip also supports ACPI power management.
This chip is found in Xircom RealPort(tm) 10/100 CardBus Ether‐
net/Modem cards, as well as some Intel OEM'd RealPort(tm) and
IBM Etherjet cards.
· Davicom DM9102 and DM9102A -- These chips are 21104A-like with
a few minor exceptions. Media is provided by an internal IEEE
802.3u-compliant PHY accessed as if it were connected to a nor‐
mal MII interface. The DM9102A also provides an external MII
interface, to which a HomePNA 1 PHY is typically connected.
The DM9102A also includes support for CardBus.
This chip also supports ACPI power management and Wake-On-LAN.
A complete list of boards with the DM9102 and DM9102A is not
available. However, the DM9102 is often found on PC mother‐
boards that include a built-in Ethernet interface.
· ASIX AX88140A and AX88141 -- These chips are 21143-like with
some exceptions. Media is proved by an internal IEEE 802.3u-
compliant PHY connected to an MII interface. Unlike most other
Tulip-like chips, AX88140A and AX88141 both require that the
transmit buffers be aligned to a 4-byte boundary.
It has a specific broadcast bit.
This chip also supports ACPI power management.
A list of boards which include the AX88140A or the AX88141 is
not yet available.
· Conexant RS7112 (LANfinity) -- These chips are 21143 clones
with coupled modem function. Media is provided by an IEEE
802.3u-compliant PHY connected to an MII interface.
A list of boards which include the RS7112 is not yet available.
MEDIA SELECTION
Media selection done using ifconfig(8) using the standard ifmedia(4)
mechanism. Refer to those manual pages for more information.
SEE ALSOarp(4), eisa(4), ifmedia(4), mii(4), netintro(4), pci(4), ifconfig(8)
Digital Equipment Corporation, DECchip 21040 Ethernet LAN Controller for
PCI Hardware Reference Manual, May 1994, Order Number EC-N0752-72.
Digital Equipment Corporation, DECchip 21041 PCI Ethernet LAN Controller
Hardware Reference Manual, Preliminary, April 1995, Order Number EC-
QAWXA-TE.
Digital Equipment Corporation, DECchip 21041 DC1017-BA Errata, Revision
1.0, April 27, 1995, Order Number EC-QD2MA-TE.
Digital Equipment Corporation, DECchip 21140 PCI Fast Ethernet LAN
Controller Hardware Reference Manual, Supersedes EC-Q0CA-TE, May 1995,
Order Number EC-Q0CB-TE.
Digital Equipment Corporation, DECchip 21140A PCI Fast Ethernet LAN
Controller Hardware Reference Manual, Supersedes EC-QN7NA-TE, EC-QN7NB-
TE, January 1996, Order Number EC-QN7NC-TE.
Intel Corporation, 21143 PCI/CardBus 10/100Mb/s Ethernet LAN Controller
Hardware Reference Manual, Revision 1.0, October 1998, Document Number
278074-001.
Digital Equipment Corporation, Ethernet Address ROM Programming: An
Application Note, April 1994, Order Number EC-N3214-72.
Digital Equipment Corporation, Using the DECchip 21041 with Boot ROM,
Serial ROM, and External Register: An Application Note, April 1995, Order
Number EC-QJLGA-TE.
Digital Equipment Corporation, Connecting the DECchip 21140 PCI Fast
Ethernet LAN Controller to the Network: An Application Note, Preliminary,
December 1994, Order Number EC-QAR2A-TE.
Macronix International Co., Ltd., MXIC MX98713 PMAC 100/10BASE PCI MAC
Controller, Revision 1.1, November 8, 1996, Part Number: PM0386.
Macronix International Co., Ltd., MXIC MX98713A Fast Ethernet MAC
Controller, Revision 1.0, August 28, 1997, Part Number: PM0489.
Macronix International Co., Ltd., MXIC MX98715A Single Chip Fast Ethernet
NIC Controller, Revision 1.2, February 24, 1999, Part Number: PM0537.
Macronix International Co., Ltd., MXIC MX98725 Single Chip Fast Ethernet
NIC Controller, Revision 1.7, September 15, 1998, Part Number: PM0468.
Macronix International Co., Ltd., MXIC MX98715 Application Note, Revision
1.5, October 9, 1998, Part Number: PM0498.
Macronix International Co., Ltd., MXIC MX98715A Application Note,
Revision 1.2, October 9, 1998, Part Number: PM0541.
Macronix International Co., Ltd., MXIC MX98725 Application Note, Revision
1.1, July 10, 1998, Part Number: PM0525.
Macronix International Co., Ltd., MXIC LC82C115 Single Chip Fast Ethernet
NIC Controller, Revision 0.2, February 12, 1999, Part Number: PM0572.
LITE ON, Inc., PNIC Hardware Specification, Revision 1.0, December 1,
1994.
ADMtek Incorporated, Comet: AL981 PCI 10/100 Fast Ethernet Controller
with Integrated PHY, Revision 0.93, January, 1999.
Winbond Electronics Corporation, Winbond LAN W89C840F 100/10Mbps Ethernet
Controller, Revision A1, April 1997.
Xircom X3201-3 CardBus 10/100 Mbps Ethernet Controller Software
Developer's Specification, Revision B, April 7, 1999, Reference number:
103-0548-001.
Davicom DM9102 10/100 Mbps Single Chip LAN Controller, Version DM9102-DS-
F01, July 22, 1999.
Davicom DM9102A Single Chip Fast Ethernet NIC Controller, Version
DM9102A-DS-F01, January 20, 2000.
ASIX Electronics Co., ASIX AX88140A 100BaseTX/FX PCI Bus Fast Ethernet
MAC Controller, Preliminary, March 11, 1997, Document Number AX140D2.DOC.
Conexant Systems, Inc., LANfinity - Home Networking Physical Layer Device
with Integrated Analog Front End Circuitry, Revision A, March 12, 1999.
HISTORY
The tlp driver first appeared in NetBSD 1.5.
AUTHORS
The tlp driver was written by Jason R. Thorpe while employed at the
Numerical Aerospace Simulation Facility, NASA Ames Research Center. The
author may be contacted at ⟨thorpej@NetBSD.org⟩.
ASIX AX88140A and AX881401 support was added by Rui Paulo
⟨rpaulo@NetBSD.org⟩.
Conexant RS7112 support was contributed by Frank Wille
⟨frank@phoenix.owl.de⟩.
BUGS
Media autosense is not yet supported for any serial or PCS function
media. It is, however, supported for IEEE 802.3u-compliant PHY media.
BSD March 26, 2006 BSD
