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PDF AM79C974 Data sheet ( Hoja de datos )
| Número de pieza | AM79C974 | |
| Descripción | PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems | |
| Fabricantes | Advanced Micro Devices | |
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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
1 page  
PRELIMINARY
AMD
TABLE OF CONTENTS
DISTINCTIVE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
HIGH LEVEL BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
RELATED PRODUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
CONNECTION DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
PIN DESIGNATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Listed By Pin Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Listed By Pin Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Quick Reference Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Listed By Driver Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
LOGIC SYMBOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PCI Bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Ethernet Controller Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Board Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Microwire EEPROM Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Attachment Unit Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Twisted-Pair Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
SCSI Controller Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Test Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
BASIC FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
System Bus Interface Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Software Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Ethernet Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
SCSI Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DETAILED FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Bus Interface Unit (BIU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Slave Configuration Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Slave I/O Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Bus Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Bus Master DMA Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Target Initiated Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Master Initiated Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Ethernet Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Buffer Management Unit (BMU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Re-Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Buffer Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Descriptor Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Descriptor Ring Access Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Polling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Transmit Descriptor Table Entry (TDTE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Receive Descriptor Table Entry (RDTE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Am79C974
5
5 Page 
PRELIMINARY
RELATED PRODUCTS
Part No.
Am33C93A
Am386®
Am486TM
Am53C94/96
Am53C974
Am53CF94/96
Am79C90
Am79C98
Am79C100
Am79C900
Am79C940
Am79C960
Am79C961
Am79C965
Am79C970
Am79C981
Am79C987
Am7990
Am7996
Am85C30
Description
Synchronous SCSI Controller
High-Performance 32-Bit Microprocessor
High-Performance 32-Bit Microprocessor
High-Performance SCSI Controller
PCSCSITM Bus Mastering Fast SCSI Controller for PCI Systems
Enhanced Fast SCSI-2 Controller
CMOS Local Area Network Controller for Ethernet (C-LANCE)
Twisted-Pair Ethernet Transceiver (TPEX)
Twisted-Pair Ethernet Transceiver Plus (TPEX+)
Integrated Local Area Communications ControllerTM (ILACCTM)
Media Acces Controller for Ethernet (MACETM)
PCnet-ISA Single-Chip Ethernet Controller (for ISA bus)
PCnet-ISA+ Single-Chip Ethernet Controller (with Microsoft® Plug n’ Play support)
PCnet-32 Single-Chip 32-Bit Ethernet Controller (for 386DX, 486 and VL buses)
PCnet-PCI Single-Chip Ethernet Controller for PCI Local Bus
Integrated Multiport Repeater PlusTM (IMR+TM)
Hardware Implemented Management Information BaseTM (HIMIBTM)
Local Area Network Controller for Ethernet (LANCE)
IEEE 802.3/Ethernet/Cheapernet Tap Transceiver
Enhanced Serial Communication Controller
AMD
Am79C974
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AM79C974.PDF ] | |
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