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 designed to address high-performance system application requirements. This single-chip is a flexible bus-mastering device that can be used in many applications, including network- and SCSI-ready PCs, printers, fax modems, and bridge/router designs. The bus-master architecture provides high data throughput in the system and low CPU and system bus utilization. The PCnet-SCSI controller is fabricated with AMD’s advanced low-power CMOS process to provide low operating and standby current for power sensitive applications.

DISTINCTIVE CHARACTERISTICS
PCI Features
■ Direct glueless interface to 33 MHz, 32-bit PCI local bus
■ 132 Mbyte/s burst DMA transfer rate
■ Compliant to PCI local bus Specification Revision 2.0

Ethernet Features
■ Supports ISO 8802-3 (IEEE/ANSI 802.3) and Ethernet Standards
■ High-performance Bus Master architecture with integrated DMA Buffer Management Unit for low CPU and bus utilization
■ Individual 136-byte transmit and 128-byte receive FIFOs provide frame buffering for increased system latency
■ MicrowireTM EEPROM interface supports jumperless design
■ Integrated Manchester Encoder/Decoder
■ Provides integrated Attachment Unit Interface (AUI) and 10BASE-T transceiver with automatic port selection
■ Automatic Twisted-Pair receive polarity detection and automatic correction of the receive polarity
■ Dynamic transmit FCS generation programmable on a frame-by-frame basis
■ Internal/external loopback capabilities
■ 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
■ Compliant to ANSI standards X3.131 – 1986 (SCSI-1) and X3.131 – 199X (SCSI-2)
■ Fast 8-bit SCSI-2 10 Mbyte/s synchronous or 7 Mbyte/s asynchronous data transfer rate
■ SCSI specific Bus Mastering DMA engine (32-bit address/data)
■ 96-byte DMA FIFO for low bus latency
■ On-chip state machine to control the SCSI sequences in hardware
■ Integrated industry standard Fast SCSI-2 core
■ Single-Ended 48 mA outputs to drive the SCSI bus directly
■ Support for Scatter-Gather DMA data transfers
■ Hooks in silicon and software to enable disk drive spin down for power savings

General Features
■ Software compatible with AMD’s Am79C960 PCnet-ISA, Am79C961 PCnet-ISA+, Am79C965 PCnet-32, Am79C970 PCnet-PCI register and descriptor architecture
■ Plug-in and software compatible with AMD’s PCSCSI family of SCSI controllers for PCI
■ NAND Tree test mode for connectivity testing on printed circuit boards
■ Single +5 V power supply operation
■ Low-power, CMOS design with sleep modes for both Ethernet and SCSI controllers allows reduced power consumption for critical battery powered applications and ‘Green PCs’
■ Fully static design for low frequency and power operation
■ 132-pin PQFP package