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AM79C971

PCnet™-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus

Advanced Micro Devices 

s Supports up to 1 Megabyte (Mbyte) optional

Boot PROM and Flash for diskless node

application

s Look-Ahead Packet Processing (LAPP) data

handling technique reduces system overhead

by allowing protocol analysis to begin before

the end of a receive frame

s Includes Programmable Inter Packet Gap (IPG)

to address less network aggressive MAC

controllers

s Offers the Modified Back-Off algorithm to

address the Ethernet Capture Effect

s IEEE 1149.1-compliant JTAG Boundary Scan

test access port interface and NAND tree test

mode for board-level production connectivity

test

s Implements low-power management for critical

battery powered application and green PCs

— Includes two power-saving sleep modes

(sleep and snooze)

— Integrated Magic Packet™ technology

support for remote power of networked PCs

s Software compatible with AMD PCnet Family

and LANCE/C-LANCE register and descriptor

architecture

s Compatible with the existing PCnet Family

driver/diagnostic software

s Available in 160-pin TQFP and 176-pin TQFP

packages

GENERAL DESCRIPTION

The Am79C971 controller is a single-chip 32-bit full-du-

plex, 10/100-Megabit per second (Mbps) highly-

integrated Ethernet system solution, designed to

address high-performance system application require-

ments. It is a flexible bus mastering device that can be

used in any application, including network-ready PCs

and bridge/router designs. The bus master architecture

provides high data throughput in the system and low

CPU and system bus utilization. The Am79C971 con-

troller is fabricated with AMD’s advanced low-power

Complementary Metal Oxide Semiconductor (CMOS)

process to provide low operating and standby current

for power sensitive applications.

The Am79C971 controller is a complete Ethernet node

integrated into a single VLSI device. 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 Controller (MAC), a large

Transmit FIFO and a large Receive FIFO, SRAM-

based FIFO extension with support for up to 128K

bytes of external frame buffering, an IEEE 802.3u-com-

pliant MII, an IEEE 802.3-compliant Twisted-Pair Trans-

ceiver Media Attachment Unit (10BASE-T MAU), and

an IEEE 802.3-compliant Attachment Unit Interface

(AUI). Both proprietary full-duplex and IEEE 802.3

compliant half-duplex operation are supported on the

MII, AUI, GPSI, and 10BASE-T MAU interfaces. 10-

Mbps operation is supported through the MII, AUI, and

10BASE-T MAU interfaces, and 100 Mbps operation is

supported through the MII. The 10BASE-T MAU inter-

face includes an IEEE 802.3-compliant auto-negotia-

tion implementation, which will automatically negotiate

between half- and full-duplex with another IEEE 802.3-

compliant auto-negotiation 10BASE-T device.

The Am79C971 controller is register compatible with

the LANCE (Am7990) Ethernet controller, the C-

LANCE (Am79C90) Ethernet controller, and all Ether-

net controllers in the PCnet Family except ILACC

(Am79C900), including the PCnet-ISA controller

(Am79C960),PCnet-ISA+ controller (Am79C961),

PCnet-ISA II controller (Am79C961A), PCnet-32 con-

troller (Am79C965), PCnet-PCI controller

(Am79C970), and PCnet-PCI II controller

(Am79C970A). The Buffer Management Unit supports

the LANCE and PCnet descriptor software models.

The 32-bit multiplexed bus interface unit provides a

direct interface to the PCI local bus, simplifying the

design of an Ethernet node in a PC system. The

Am79C971 controller provides the complete interface

to an Expansion ROM or Flash device allowing add-on

card designs with only a single load per PCI bus inter-

face pin. With its built-in support for both little and big

endian byte alignment, this controller also addresses

non-PC applications. The Am79C971 controller’s ad-

vanced CMOS design allows the bus interface to be

connected to either a +5-V or a +3.3-V signaling envi-

ronment. 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 Am79C971 controller supports auto-configuration

in the PCI configuration space. Additional Am79C971

controller configuration parameters, including the

unique IEEE physical address, can be read from an ex-

ternal non-volatile memory (EEPROM) immediately fol-

lowing system reset.

The integrated Manchester encoder/decoder (MEN-

DEC) eliminates the need for an external Serial Inter-

face Adapter (SIA) in the system. The built-in GPSI

allows the MENDEC to be bypassed.

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Am79C971

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