DP83905AVQB datasheet(8/80 Pages) NSC

8 / 80 page

30 Simplified Application Diagram

TLF11498 – 3

40 Functional Description

The ATLANTIC Controller is a highly integrated and config-

urable Ethernet controller making it suitable for most Ether-

net applications The ATLANTIC Controller integrates the

functions of the following blocks

1 DP8390 Ethernet Controller Core and Media Access

Control logic

2 ISA Bus Interface containing all logic required to connect

the DP8390 core to a packet buffer RAM and the ISA

bus

3 Media Interface which includes an EncoderDecoder

block with an AUI (Attachment Unit Interface) and a

10BASE-T Twisted Pair Interface

41 BUS INTERFACE BLOCK

The ATLANTIC Controller’s Bus interface block provides

the circuitry to interface the Ethernet controller logic and

the external packet buffer RAM to an ISA (Industry Standard

Architecture) Bus The bus interface provides several con-

figuration modes which offer various different features de-

pending on the designer’s specific design requirements

The possible modes are

1 16-Bit or 8-Bit Shared Memory Compatible Mode

2 16-Bit or 8-Bit Shared Memory Enhanced Mode

3 16-Bit or 8-Bit IO Port Compatible Mode

4 16-Bit or 8-Bit IO Port Enhanced Mode

This section describes the function of each of these modes

DP83905AVQB Datasheet(PDF) 8 Page - National Semiconductor (TI)