DP8390D Datasheet | National Semiconductor

Description The DP8390D NS32490D Network Interface Controller (NIC) is a micro CMOS VLSI device designed to ease interfacing with CSMA CD type local area networks including Ethernet Thin Ethernet (Cheapernet) and Star LAN The NIC implements all Media Access Control (MAC) layer functions for transmission and reception of packets in accordance with the IEEE 802 3 Standard Unique dual DMA channels 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 plete IEEE 802 3 protocol and node electronics as shown below The others include the DP8391 Serial Network Interface (SNI) and the DP8392 Coaxial Transceiver Interface (CTI) Table of Contents 1 0 SYSTEM DIAGRAM 2 0 BLOCK DIAGRAM 3 0 FUNCTIONAL DESCRIPTION 4 0 TRANSMIT RECEIVE PACKET ENCAPSULATION DECAPSULATION 5 0 PIN DESCRIPTIONS 6 0 DIRECT MEMORY ACCESS CONTROL (DMA) 7 0 PACKET RECEPTION 8 0 PACKET TRANSMISSION 9 0 REMOTE DMA 10 0 INTERNAL REGISTERS 11 0 INITIALIZATION PROCEDURES 12 0 LOOPBACK DIAGNOSTICS 13 0 BUS ARBITRATION AND TIMING 14 0 PRELIMINARY ELECTRICAL CHARACTERISTICS 15 0 SWITCHING CHARACTERISTICS 16 0 PHYSICAL DIMENSIONS Features Y Y patible with IEEE 802 3 Ethernet II Thin Ethernet Star LAN Interfaces with 8- 16- and 32-bit microprocessor systems Implements simple versatile buffer management Requires single 5V supply Utilizes low power micro CMOS 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 1 0 System Diagram IEEE 802 3 patible Ethernet Thin Ethernet Local Area Network Chip Set ww.. TL F 8582 - 1 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National...