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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
PCnet™-FAST III
Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
DISTINCTIVE CHARACTERISTICS
a73 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
a73 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
a73 Dual-speed CSMA/CD (10 Mbps and 100 Mbps)
Media Access Controller (MAC) compliant with
IEEE/ANSI 802.3 and Blue Book Ethernet
standards
a73 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 Packet™
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
a73 Serial Management Interface enables remote
alerting of system management events
— Inter-IC (I
2
C) compliant electrical interface
— System Management Bus (SMBus)
compliant signaling interface and register
access protocol
— Optional interrupt pin simplifies software
interface
a73 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
a73 EEPROM interface supports jumperless design
and provides through-chip programming
— Supports extensive programmability of
device operation through EEPROM mapping
a73 Supports up to 1 megabyte (Mbyte) optional
Boot PROM and Flash for diskless node
application
a73 Extensive programmable internal/external
loopback capabilities
a73 Extensive programmable LED status support