PRELIMINARY

This document contains information on a product under development at Advanced Micro Devices. The information
is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed
product without notice.

Publication# 21510

Rev: E Amendment/0

Issue Date: August 2000

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Am79C973/Am79C975

PCnetTM-FAST III
Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY

DISTINCTIVE CHARACTERISTICS

Single-chip PCI-to-Wire Fast Ethernet controller

-- 32-bit glueless PCI host interface

-- Supports PCI clock frequency from DC to

33 MHz independent of network clock

-- Supports network operation with PCI clock

from 15 MHz to 33 MHz

-- High performance bus mastering

architecture with integrated Direct Memory
Access (DMA) Buffer Management Unit for
low CPU and bus utilization

-- PCI specification revision 2.2 compliant

-- Supports PCI Subsystem/Subvendor ID/

Vendor ID programming through the
EEPROM interface

-- Supports both PCI 5.0 V and 3.3 V signaling

environments

-- Plug and Play compatible

-- Big endian and little endian byte alignments

supported

Fully Integrated 10/100 Mbps Physical Layer
Interface (PHY)

-- Conforms to IEEE 802.3 standard for

10BASE-T, 100BASE-TX, and 100BASE-FX
interfaces

-- Integrated 10BASE-T transceiver with on-

chip filtering

-- Fully integrated MLT-3 encoder/decoder for

100BASE-TX

-- Provides a PECL interface for 100BASE-FX

fiber implementations

-- Full-duplex capability for 10BASE-T and

100BASE-TX

-- IEEE 802.3u Auto-Negotiation between 10

Mbps and 100 Mbps, half- and full-duplex op-
eration

Dual-speed CSMA/CD (10 Mbps and 100 Mbps)
Media Access Controller (MAC) compliant with
IEEE/ANSI 802.3 and Blue Book Ethernet
standards

Supports PC98/PC99 and Wired for
Management baseline specifications

-- Full OnNow support including pattern

matching and link status wake-up events

-- Implements AMD's patented Magic PacketTM

technology for remote wake-up & power-on

-- Magic Packet mode and the physical address

loaded from EEPROM at power up without
requiring PCI clock

-- Supports PCI Bus Power Management

Interface Specification Revision 1.1

-- Supports Advanced Configuration and

Power Interface (ACPI) Specification Version
1.0

-- Supports Network Device Class Power

Management Specification Version 1.0a

Serial Management Interface enables remote
alerting of system management events

-- Inter-IC (I

C) compliant electrical interface

-- System Management Bus (SMBus)

compliant signaling interface and register
access protocol

-- Optional interrupt pin simplifies software

interface

Large independent internal TX and RX FIFOs

-- Programmable FIFO watermarks for both TX

and RX operations

-- RX frame queuing for high latency PCI bus

host operation

-- Programmable allocation of buffer space

between RX and TX queues

EEPROM interface supports jumperless design
and provides through-chip programming

-- Supports extensive programmability of

device operation through EEPROM mapping

Supports up to 1 megabyte (Mbyte) optional
Boot PROM and Flash for diskless node
application

Extensive programmable internal/external
loopback capabilities

Extensive programmable LED status support

Am79C973/Am79C975

P R E L I M I N A R Y

Look-Ahead Packet Processing (LAPP) data
handling technique reduces system overhead
by allowing protocol analysis to begin before
the end of a receive frame

Includes Programmable Inter Packet Gap (IPG)
to address less network aggressive MAC
controllers

Offers the Modified Back-Off algorithm to
address the Ethernet Capture Effect

IEEE 1149.1-compliant JTAG Boundary Scan
test access port interface and NAND tree test

mode for board-level production connectivity
test

Compatible with the existing PCnet Family
driver/diagnostic software

Software compatible with AMD PCnet Family
and LANCETM/C-LANCETM register and
descriptor architecture

Available in 160-pin PQFP and 176-pin TQFP
packages

Advanced +3.3 V CMOS process technology for
low power operation

GENERAL DESCRIPTION

The Am79C973 and Am79C975 controllers are single-
chip 32-bit full- duplex, 10/100-Megabit per second
(Mbps) fully integrated PCI-to-Wire Fast Ethernet sys-
tem solution, designed to address high-performance
system application requirements. They are flexible bus
mastering device that can be used in any application,
including network-ready PCs and bridge/router de-
signs. The bus master architecture provides high data
throughput and low CPU and system bus utilization.
The Am79C973 and Am79C975 controllers are fabri-
cated with advanced low-power 3.3-V CMOS process
to provide low operating current for power sensitive ap-
plications.

The third generation Am79C973 and Am79C975 Fast
Ethernet controllers also have several enhancements
ove r t h e i r p r e d e c e s s o r s, t h e A m 7 9 C 9 7 1 a n d
Am79C972 devices. Besides integrating the complete
10/100 Physical Layer (PHY) interface, they further re-
duce system implementation cost by integrating the
SRAM buffers on chip.

The Am79C973 and Am79C975 controllers contain 12-
kilobyte (Kbyte) buffers, the largest of their class in 10/
100 Mbps Ethernet controllers. The large internal buff-
ers are fully programmable between the RX and TX
queues for optimal performance.

The Am79C973 and Am79C975 controllers are also
compliant with PC98/PC99 and Wired for Management
specifications. They fully support Microsoft's OnNow
and ACPI specifications, which are backward compati-
ble with Magic Packet technology and compliant with
the PCI Bus Power Management Interface Specifica-
tion by supporting the four power management states
(D0, D1, D2, and D3), the optional PME pin, and the
necessary configuration and data registers.

The Am79C973 and Am79C975 controllers are com-
plete Ethernet nodes integrated into a single VLSI de-
vice. It contains a bus interface unit, a Direct Memory
Access (DMA) Buffer Management Unit, an ISO/IEC
8802-3 (IEEE 802.3)- compliant Media Access Control-

ler (MAC), a large Transmit FIFO and a large Receive
FIFO, and an IEEE 802.3-compliant 10/100 Mbps PHY.

The integrated 10/100 PHY unit of the Am79C973 and
Am79C975 controllers implement the complete physi-
cal layer for 10BASE-T and the Physical Coding Sub-
layer (PCS), Physical Medium Attachment (PMA), and
Physical Medium Dependent (PMD) functionality for
100BASE-TX, including MLT-3 encoding/decoding. It
also supports 100BASE-FX operation by providing a
Pseudo-ECL (PECL) interface for direct connection to
a fiber optic transceiver module. The internal 10/100
PHY implements Auto-Negotiation for twisted-pair
(10T/100TX) operation by using a modified 10BASE-T
link integrity test pulse sequence as defined in the
IEEE 802.3u specification. The Auto-Negotiation func-
tion automatically configures the controller to operate
at the maximum performance level supported across
the network link.

The Am79C975 controller also implements a Serial
Management Interface in addition to the advanced
management features offered with the Am79C973 con-
troller. The Serial Management Interface is based on
the industry standard Inter-IC (I

C) and System Man-

agement Bus (SMBus) specifications and enables a
system to communicate with another network station
for remote monitoring and alerting of local system man-
agement parameters and events. This simple yet pow-
erful Serial Management Interface is capable of
communicating within the system and over the network
during normal operation or in low-power modes, even if
the device is not initialized or set up for transmit or re-
ceive operation by the network software driver.

The 32-bit multiplexed bus interface unit provides a di-
rect interface to the PCI local bus, simplifying the
design of an Ethernet node in a PC system. The
Am79C973 and Am79C975 controllers provide the
complete interface to an Expansion ROM or Flash de-
vice allowing add-on card designs with only a single
load per PCI bus interface pin. With their built-in sup-
port for both little and big endian byte alignment, the

Am79C973/Am79C975

P R E L I M I N A R Y

controllers also address non-PC applications. The
Am79C973 and Am79C975 controllers' advanced
CMOS design allows the bus interface to be connected
to either a +5-V or a +3.3-V signaling environment. A
compliant IEEE 1149.1 JTAG test interface for board-
level testing is also provided, as well as a NAND tree
test structure for those systems that cannot support the
JTAG interface.

The Am79C973 and Am79C975 controllers support
auto-configuration in the PCI configuration space. Ad-
ditional Am79C973 and Am79C975 controller configu-
ration parameters, including the unique IEEE physical
address, can be read from an external non-volatile
memory (EEPROM) immediately following system re-
set.

In addition, the Am79C973 and Am79C975 controllers
provide programmable on-chip LED drivers for trans-
mit, receive, collision, link integrity, Magic Packet sta-
tus, activity, link active, address match, full-duplex, 10
Mbps or 100 Mbps, or jabber status.

The Am79C973 and Am79C975 controllers are regis-
ter compatible with the LANCETM (Am7990) Ethernet
controller, the C-LANCETM (Am79C90) Ethernet con-
troller, and all Ethernet controllers in the PCnetTM Fam-
ily, except ILACCTM (Am79C900), including the PCnet-
ISATM (Am79C960), PCnet-ISA+TM (Am79C961),
P C n e t - I S A I I TM ( A m 7 9 C 9 6 1 A ) , P C n e t - 3 2 TM
( A m 7 9 C 9 6 5 ) , P C n e t - P C I TM ( A m 7 9 C 9 7 0 ) ,
P C n e t -PC I II TM (A m 7 9 C9 7 0 A ), P Cn e t - FAST TM
(Am79C971), and PCnet-FAST+TM (Am79C972). The
Buffer Management Unit supports the LANCE and
PCnet descriptor software models.

The Am79C973 and Am79C975 controllers are ideally
suited for LAN on the motherboard, network adapter
card, and embedded designs. It is available in a 160-
pin Plastic Quad Flat Pack (PQFP) package and also in
a 176-pin Thin Quad Flat Pack (TQFP) package for
form factor sensitive designs.

Am79C973/Am79C975

P R E L I M I N A R Y

DISTINCTIVE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
RELATED AMD PRODUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
CONNECTION DIAGRAM (PQR160) - AM79C973 . . . . . . . . . . . . . . . . . . . . . . . . . . 18
CONNECTION DIAGRAM (PQL176) AM79C973 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
CONNECTION DIAGRAM (PQR160) - AM79C975 . . . . . . . . . . . . . . . . . . . . . . . . . . 20
CONNECTION DIAGRAM (PQL176) - AM79C975 . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
PIN DESIGNATIONS (PQR160) (Am79C973/Am79C975) . . . . . . . . . . . . . . . . . . . . 22

Listed By Pin Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

PIN DESIGNATIONS (PQL176) (Am79C973/Am79C975) . . . . . . . . . . . . . . . . . . . . . 23

Listed By Pin Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

PIN DESIGNATIONS (PQR160, PQL176) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Listed By Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

PIN DESIGNATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Listed By Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

PIN DESIGNATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Listed By Driver Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
PIN DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

PCI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Board Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Expansion Bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Media Independent Interface (MII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
External Address Detection Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
IEEE 1149.1 (1990) Test Access Port Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Network Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Clock Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Serial Management Interface (SMI) (Am79C975 only) . . . . . . . . . . . . . . . . . . . . . . 37
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

BASIC FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

System Bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Software Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Network Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Serial Management Interface (Am79C975) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
MII Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

DETAILED FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Slave Bus Interface Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Slave Configuration Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Slave I/O Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Expansion ROM Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Slave Cycle Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Parity Error Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Master Bus Interface Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

TABLE OF CONTENTS

Электронный компонент: AM79C973