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AM79C974 Datasheet(PDF) 1 Page - Advanced Micro Devices |
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AM79C974 Datasheet(HTML) 1 Page - Advanced Micro Devices |
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1 / 153 page  Publication# 18681 Rev. B Amendment /1 Issue Date: October 1994 This document contains information on a product under development at Advanced Micro Devices, Inc. The information is intended to help you to evaluate this product. AMD reserves the right to change or discontinue work on this proposed product without notice. Advanced Micro Devices Am79C974 PCnet TM-SCSI Combination Ethernet and SCSI Controller for PCI Systems PRELIMINARY 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. |
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