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GENERAL DESCRIPTION

The PCnet-ISA+ controller, a single-chip Ethernet controller, is a highly integrated system solution for the PC-AT Industry Standard Architecture (ISA ) architecture. It is designed to provide flexibility and compatibility with any existing PC application. This highly integrated 132-pin VLSI device is specifically designed to reduce parts count and cost, and addresses applications where higher system throughput is desired. The PCnet-ISA+ controller is fabricated with AMD’s advanced low-power CMOS process to provide low standby current for power sensitive applications.

DISTINCTIVE CHARACTERISTICS

■ Single-chip Ethernet controller for the Industry Standard Architecture (ISA) and Extended Industry Standard Architecture (EISA) buses

■ Supports IEEE 802.3/ANSI 8802-3 and Ethernet standards

■ Direct interface to the ISA or EISA bus

■ Software compatible with AMD’s Am7990 LANCE register and descriptor architecture

■ Low power, CMOS design with sleep mode allows reduced power consumption for critical battery powered applications

■ Individual 136-byte transmit and 128-byte receive FIFOs provide packet buffering for increased system latency, and support the following features:

— Automatic retransmission with no FIFO reload

— Automatic receive stripping and transmit padding (individually programmable)

— Automatic runt packet rejection

— Automatic deletion of received collision frames

■ Dynamic transmit FCS generation programmable on a frame-by-frame basis

■ Single +5 V power supply

■ Internal/external loopback capabilities

■ Supports 8K, 16K, 32K, and 64K Boot PROMs or Flash for diskless node applications

■ Supports Microsoft’s Plug and Play System configuration for jumperless designs

■ Supports staggered AT bus drive for reduced noise and ground bounce

■ Supports 8 interrupts on chip

■ Look Ahead Packet Processing (LAPP) allows protocol analysis to begin before end of receive frame

■ Supports 4 DMA channels on chip

■ Supports 16 I/O locations

■ Supports 16 boot PROM locations

■ Provides integrated Attachment Unit Interface (AUI) and 10BASE-T transceiver with 2 modes of port selection:

— Automatic selection of AUI or 10BASE-T

— Software selection of AUI or 10BASE-T

■ Automatic Twisted Pair receive polarity detection and automatic correction of the receive polarity

■ Supports bus-master and shared-memory architectures to fit in any PC application

■ Supports edge and level-sensitive interrupts

■ DMA Buffer Management Unit for reduced CPU intervention which allows higher throughput by by-passing the platform DMA

■ JTAG Boundary Scan (IEEE 1149.1) test access port interface for board level production test

■ Integrated Manchester Encoder/Decoder

■ 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

■ Supports LANCE General Purpose Serial Interface (GPSI)

■ 132-pin PQFP package