AM79C970 datasheet(2/168 Pages) AMD

2 / 168 page

P R E L I M I N A R Y

AMD

1-869

Am79C970

controllers in the PCnet Family, including the PCnet-ISA

controller (Am79C960), the PCnet-ISA+ controller

(Am79C961),

and

the

PCnet-32

controller

(Am79C965). The buffer management unit supports the

LANCE, ILACC, and PCnet descriptor software models.

The PCnet-PCI controller is software compatible with

the Novell NE2100 and NE1500 Ethernet adapter card

architectures. In addition, a Sleep function has been in-

corporated to provide low standby current, excellent for

notebooks and Green PCs.

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

rect interface to the PCI local bus applications, simplify-

ing the design of an Ethernet node in a PC system. With

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

alignment, this controller also addresses proprietary

non-PC applications.

The PCnet-PCI controller supports auto configuration in

the PCI configuration space. Additional PCnet-PCI

controller configuration parameters, including the

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

ternal non-volatile memory (serial EEPROM) immedi-

ately following system RESET.

The controller also has the capability to automatically

select either the AUI port or the Twisted-Pair trans-

ceiver. Only one interface is active at any one time. The

individual transmit and receive FIFOs optimize system

overhead, providing sufficient latency during frame

transmission and reception, and minimizing intervention

during normal network 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 program-

mable on-chip LED drivers for transmit, receive, colli-

sion, receive polarity, link integrity or jabber status.

BLOCK DIAGRAM

Buffer

Management

Unit

FIFO

Control

Microwire

and LED

Control

PCI Bus

Interface

Unit

802.3

MAC

Core

Manchester

Encoder/

Decoder

(PLS) &

AUI Port

10BASE-T

MAU

XTAL1

DO+/-

CI+/-

DI+/-

RXD+/-

TXD+/-

TXP+/-

XTAL2

Rcv

FIFO

Xmt

FIFO

CLK

PAR

FRAME

BE[3:0]

TRDY

IRDY

LOCK

IDSEL

DEVSEL

REQ

GNT

PERR

SERR

INTA

STOP

AD[31:00]

RST

NOUT

LNKST/EEDI

EECS

EESK/

LED1

EEDO/

LED3

18220C-1

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