AM79C974 Просмотр технического описания (PDF) - Advanced Micro Devices

Номер в каталоге

Компоненты Описание

производитель

AM79C974

PCnet™-SCSI Combination Ethernet and SCSI Controller for PCI Systems

Advanced Micro Devices 

PRELIMINARY

Am79C974

PCnetTM-SCSI Combination Ethernet and SCSI Controller

for PCI Systems

Advanced

Micro

Devices

DISTINCTIVE CHARACTERISTICS

PCI Features

s Direct glueless interface to 33 MHz, 32-bit PCI

local bus

s 132 Mbyte/s burst DMA transfer rate

s Compliant to PCI local bus Specification

Revision 2.0

Ethernet Features

s Supports ISO 8802-3 (IEEE/ANSI 802.3) and

Ethernet Standards

s High-performance Bus Master architecture with

integrated DMA Buffer Management Unit for

low CPU and bus utilization

s Individual 136-byte transmit and 128-byte

receive FIFOs provide frame buffering for

increased system latency

s MicrowireTM EEPROM interface supports

jumperless design

s Integrated Manchester Encoder/Decoder

s Provides integrated Attachment Unit Interface

(AUI) and 10BASE-T transceiver with automatic

port selection

s Automatic Twisted-Pair receive polarity detec-

tion and automatic correction of the receive

polarity

s Dynamic transmit FCS generation programma-

ble on a frame-by-frame basis

s Internal/external loopback capabilities

s Supports the following types of network

interfaces:

— AUI to external 10BASE2, 10BASE5,

10BASE-T or 10BASE-F MAU

— Internal 10BASE-T transceiver with Smart

Squelch to Twisted-Pair medium

SCSI Features

s Compliant to ANSI standards X3.131 – 1986

(SCSI-1) and X3.131 – 199X (SCSI-2)

s Fast 8-bit SCSI-2 10 Mbyte/s synchronous or

7 Mbyte/s asynchronous data transfer rate

s SCSI specific Bus Mastering DMA engine

(32-bit address/data)

s 96-byte DMA FIFO for low bus latency

s On-chip state machine to control the SCSI

sequences in hardware

s Integrated industry standard Fast SCSI-2 core

s Single-Ended 48 mA outputs to drive the SCSI

bus directly

s Support for Scatter-Gather DMA data transfers

s Hooks in silicon and software to enable disk

drive spin down for power savings

General Features

s Software compatible with AMD’s Am79C960

PCnet-ISA, Am79C961 PCnet-ISA+, Am79C965

PCnet-32, Am79C970 PCnet-PCI register and

descriptor architecture

s Plug-in and software compatible with AMD’s

PCSCSI family of SCSI controllers for PCI

s NAND Tree test mode for connectivity testing

on printed circuit boards

s Single +5 V power supply operation

s Low-power, CMOS design with sleep modes for

both Ethernet and SCSI controllers allows re-

duced power consumption for critical battery

powered applications and ‘Green PCs’

s Fully static design for low frequency and

power operation

s 132-pin PQFP package

GENERAL DESCRIPTION

The PCnet-SCSI combination Ethernet and 8-bit Fast

SCSI controller with a 32-bit PCI bus interface is a highly

integrated Ethernet-Fast SCSI system solution de-

signed to address high-performance system application

requirements. This single-chip is a flexible bus-master-

ing device that can be used in many applications, includ-

ing network- and SCSI-ready PCs, printers, fax

modems, and bridge/router designs. The bus-master

architecture provides high data throughput in the sys-

tem and low CPU and system bus utilization. The

PCnet-SCSI controller is fabricated with AMD’s ad-

vanced low-power CMOS process to provide low oper-

ating and standby current for power sensitive

applications.

This document contains information on a product under development at Advanced Micro Devices, Inc. The information is intended Publication# 18681 Rev. B Amendment /1

to help you to evaluate this product. AMD reserves the right to change or discontinue work on this proposed product without notice. Issue Date: October 1994

Share Link: