91C94中文資料SMSC數(shù)據(jù)手冊PDF規(guī)格書

GENERAL DESCRIPTION

The LAN91C94 is a VLSI Ethernet Controller that combines ISA and PCMCIA interfaces in one chip. LAN91C94 integrates all the MAC and physical layer functions, as well as the packet RAM, needed to implement a high performance 10BASE-T (twisted pair) node. For 10BASE5 (thick coax), 10BASE2 (thin coax), and 10BASE-F (fiber) implementations, the LAN91C94 interfaces to external transceivers via its AUI port. Only one additional IC is required on most applications. The LAN91C94 occupies 16 I/0 locations and no memory space except for PCMCIA attribute memory space.

FEATURES

? ISA/PCMCIA Single-Chip Ethernet Controller

? 4608 Bytes of On-Chip RAM

? Supports IEEE 802.3 (ANSI 8802-3) Ethernet Standards

? Simultasking TM - Early Transmit and Early Receive Functions

? Hardware Memory Management Unit

? Optional Configuration via Serial EEPROM Interface (Jumperless)

? Single +5V Power Supply

? Low Power CMOS Design

? 100 Pin QFP, TQFP and VTQFP Package

Bus Interface

? Direct Interface to ISA and PCMCIA with No Wait States

? Flexible Bus Interface

? 16-Bit Data and Control Paths

? Fast Access Time (40 ns)

? Pipelined Data Path

? Handles Block Word Transfers for Any Alignment

? High Performance Chained (Back-toBack) Transmit and Receive

? Pin Compatible with LAN91C92 (in ISA mode)

? Flat Memory Structure for Low CPU Overhead

? Dynamic Memory Allocation Between Transmit and Receive

? Buffered Architecture, Insensitive to Bus Latencies (No Overruns/Underruns)

? Supports Boot PROM for Diskless ISA Applications

Network Interface

? Integrates 10BASE-T Transceiver Functions:

- Driver and Receiver

- Link Integrity Test

- Receive Polarity Detection and Correction

? Integrates AUI Interface

? Implements 10 Mbps Manchester Encoding/Decoding and Clock Recovery

? Automatic Retransmission, Bad Packet Rejection, and Transmit Padding

? External and Internal Loopback Modes

? Four Direct Driven LEDs for Status/Diagnostics

Software Drivers

? Uses Certified LAN9000 Drivers Which Operate with Every Major Network Operating System

? Software Driver Compatible with LAN91C92 and LAN91C100 (100 Mbps) Controllers in ISA Mode

? Software Driver Utilizes Full Capability of 32 Bit Microprocessor