AM79C978 Ver la hoja de datos (PDF) - Advanced Micro Devices

Número de pieza

componentes Descripción

Lista de partido

AM79C978

PCnet™- Home Single-Chip 1/10 Mbps PCI Home Networking Controller

Advanced Micro Devices 

n 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

n Extensive programmable internal/external

loopback capabilities

n EEPROM interface supports jumperless design

and provides through-chip programming

— Supports full programmability of half-/full-

duplex operation through EEPROM mapping

— Programmable PHY reset output pin capable

of resetting external PHY without the need

for buffering

n Extensive programmable LED status support

n Look-Ahead Packet Processing (LAPP) data

handling technique reduces system overhead

by allowing protocol analysis to begin before

the end of a receive frame

n Includes Programmable Inter Packet Gap (IPG)

to address less network aggressive MAC

controllers

n Offers the Modified Back-Off algorithm to

address the Ethernet Capture Effect

n IEEE 1149.1-compliant JTAG Boundary Scan

test access port interface and NAND tree test

mode for board-level production connectivity

test

n Software compatible with AMD’s PCnet™

Family and LANCE/C-LANCE register and

descriptor architecture

n Very low power consumption

n +3.3 V power supply along with 5 V tolerant I/Os

enable broad system compatibility

n Available in 144-pin TQFP and 160-pin PQFP

packages

GENERAL DESCRIPTION

The Am79C978 controller is the first in a series of home

networking products from AMD. The Am79C978 con-

troller is fabricated in an advanced low power 3.3 V

CMOS process to provide low operating current for

power sensitive applications.

The Am79C978 controller contains an Ethernet Con-

troller based on the Am79C971 Fast Ethernet control-

ler, a physical layer device for supporting the 802.3

standard for 10BASE-T, and a physical layer device for

data networking at speeds up to 1 Mbps over ordinary

residential telephone wiring.

The integrated PCI Ethernet controller is a highly inte-

grated 32-bit full-duplex, 10/100 Mbps Ethernet con-

troller solution designed to address high-performance

system application requirements. It is a flexible bus-

mastering device that can be used in any application,

including network ready PCs. The bus master architec-

ture provides high data throughput and low CPU and

system bus utilization.

The integrated Ethernet transceiver is a physical layer

device supporting the IEEE 802.3 standards for

10BASE-T. It provides all of the PHY layer functions re-

quired to support 10 Mbps data transfer speeds.

The integrated HomePNA transceiver is a physical

layer device that enables data networking at speeds up

to 1 Mbps over common residential phone wiring re-

gardless of topology and without disrupting telephone

(POTS) service.

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

rect interface to the PCI local bus, simplifying the de-

sign of an Ethernet or home network node in a PC

system. The device has built-in support for both little

and big endian byte alignment. The integrated home

networking controller’s advanced CMOS design allows

the bus interface to be connected to either a +5.0 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 do not support the JTAG interface.

The integrated Am79C978 home networking controller

is also compliant with the PC98 and Net PC specifica-

tions. It includes the full implementation of the Mi-

crosoft OnNow and ACPI specifications, which are

backward compatible with Magic Packet technology. It

is also compliant with the PCI Bus Power Management

Interface specification by supporting the four power

management states (D0, D1, D2, and D3), the optional

PME pin, and the necessary configuration and data

registers.

The integrated Am79C978 home networking controller

is a complete Ethernet or home network node inte-

grated into a single VLSI device. It contains a bus inter-

face unit, a Direct Memory Access (DMA) Buffer

Management Unit, an ISO/IEC 88023 (IEEE 802.3)

compliant Media Access Controller (MAC), a Transmit

FIFO and a large Receive FIFO, and an IEEE 802.3u

compliant MII. Both IEEE 802.3 compliant full-duplex

and half-duplex operations are supported on the MII in-

terface. 10/100 Mbps operation is supported through

the MII interface.

The integrated Am79C978 home networking controller

is register compatible with the LANCE (Am7990) and

C-LANCE (Am79C90) Ethernet controllers and all

2

Am79C978

Share Link: