DP8390D datasheet(2/58 Pages) TI1

2 / 58 page

TLF8582

July 1995

DP8390DNS32490D NIC Network Interface Controller

General Description

The DP8390DNS32490D Network Interface Controller

(NIC) is a microCMOS VLSI device designed to ease inter-

facing with CSMACD type local area networks including

Ethernet Thin Ethernet (Cheapernet) and StarLAN The

NIC implements all Media Access Control (MAC) layer func-

tions for transmission and reception of packets in accord-

ance with the IEEE 8023 Standard Unique dual DMA chan-

nels and an internal FIFO provide a simple yet efficient

packet management design To minimize system parts

count and cost all bus arbitration and memory support logic

are integrated into the NIC

The NIC is the heart of a three chip set that implements the

complete IEEE 8023 protocol and node electronics as

shown below The others include the DP8391 Serial Net-

work Interface (SNI) and the DP8392 Coaxial Transceiver

Interface (CTI)

Features

Compatible with IEEE 8023Ethernet IIThin Ethernet

StarLAN

Interfaces with 8- 16- and 32-bit microprocessor

systems

Implements simple versatile buffer management

Requires single 5V supply

Utilizes low power microCMOS process

Includes

Two 16-bit DMA channels

16-byte internal FIFO with programmable threshold

Network statistics storage

Supports physical multicast and broadcast address

filtering

Provides 3 levels of loopback

Utilizes independent system and network clocks

Table of Contents

10 SYSTEM DIAGRAM

20 BLOCK DIAGRAM

30 FUNCTIONAL DESCRIPTION

40 TRANSMITRECEIVE PACKET ENCAPSULATION

DECAPSULATION

50 PIN DESCRIPTIONS

60 DIRECT MEMORY ACCESS CONTROL (DMA)

70 PACKET RECEPTION

80 PACKET TRANSMISSION

90 REMOTE DMA

100 INTERNAL REGISTERS

110 INITIALIZATION PROCEDURES

120 LOOPBACK DIAGNOSTICS

130 BUS ARBITRATION AND TIMING

140 PRELIMINARY ELECTRICAL CHARACTERISTICS

150 SWITCHING CHARACTERISTICS

160 PHYSICAL DIMENSIONS

10 System Diagram

IEEE 8023 Compatible EthernetThin Ethernet Local Area Network Chip Set

TLF8582 – 1

TRI-STATE

is a registered trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A

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