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AM79C970A

PCnet™-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product

Advanced Micro Devices 

CPU and system bus utilization. The PCnet-PCI II con-

troller is fabricated with AMD’s advanced low-power

CMOS process to provide low operating and standby

current for power-sensitive applications.

The PCnet-PCI II controller is a complete Ethernet

node integrated into a single VLSI device. It contains a

bus interface unit, a DMA buffer management unit, an

IEEE 802.3-compliant media access control (MAC)

function, individual 272-byte transmit and 256-byte re-

ceive FIFOs, an IEEE 802.3-compliant attachment unit

interface (AUI) and twisted-pair transceiver medium at-

tachment unit (10BASE-T MAU) that can both operate

in either half-duplex or full-duplex mode.

The PCnet-PCI II controller is register-compatible with

the LANCE (Am7990) Ethernet controller, the

C-LANCE (Am79C90) Ethernet controller, the ILACC

(Am79C900) Ethernet controller, and all Ethernet con-

trollers in the PCnet family, including the PCnet-ISA

controller (Am79C960), PCnet-ISA+ controller

(Am79C961), PCnet-ISA II controller (Am79C961A),

PCnet-32 controller (Am79C965), PCnet-PCI control-

ler (Am79970), and the PCnet-SCSI controller

(Am79C974). The buffer management unit supports

the C-LANCE, ILACC, and PCnet descriptor software

models. The PCnet-PCI II controller is software com-

patible with the Novell® NE2100 and NE1500 Ethernet

adapter card architectures.

The 32-bit multiplexed bus interface unit provides a di-

rect interface to PCI local bus applications, simplifying

the design of an Ethernet node in a PC system. The

PCnet-PCI II controller provides the complete interface

to an expansion ROM, allowing add-on card designs

with only a single load per PCI bus interface pin. With

its built-in support for both little and big endian byte

alignment, this controller also addresses proprietary

non-PC applications. The PCnet-PCI II controller’s ad-

vanced CMOS design allows the bus interface to be

connected to either a 5 V or a 3.3 V signaling environ-

ment. Both NAND Tree and JTAG test interfaces are

provided.

The PCnet-PCI II controller supports automatic config-

uration in the PCI configuration space. Additional PC-

net-PCI II configuration parameters, including the

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

ternal non-volatile memory (microwire EEPROM) im-

mediately following system reset.

The controller has the capability to automatically select

either the AUI port or the twisted-pair transceiver. Only

one interface is active at any one time. Both network in-

terfaces can be programmed to operate in either half-

duplex or full-duplex mode. The individual transmit and

receive FIFOs optimize system overhead, providing

sufficient latency during frame transmission and recep-

tion, and minimizing intervention during normal net-

work error recovery. The integrated Manchester

encoder/decoder (MENDEC) eliminates the need for

an external serial interface adapter (SIA) in the system.

In addition, the device provides programmable on-chip

LED drivers for transmit, receive, collision, receive po-

larity, link integrity, activity, or jabber status. The PC-

net-PCI II controller also provides an external address

detection interface (EADI) to allow fast external hard-

ware address filtering in internetworking applications.

For power-sensitive applications where low standby

current is desired, the device incorporates two sleep

functions to reduce overall system power consumption,

excellent for notebooks and Green PCs. In conjunction

with these low power modes, the PCnet-PCI II control-

ler also has integrated functions to support Magic

Packet, an inexpensive technology that allows remote

wakeup of Green PCs.

With the rise of embedded networking applications op-

erating in harsh environments where temperatures

may exceed the normal commercial temperature win-

dow (0°C to +70°C), an industrial temperature (–40°C

to +85°C) version is available in both the 132-pin PQFP

and the 144-pin TQFP package. The industrial temper-

ature version of the PCnet-PCI II Ethernet controller is

characterized across the industrial temperature range

(–40°C to +85°C) within the published power supply

specification (4.75 V to 5.25 V; i.e., ±5% VCC).

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Am79C970A

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