CS8920A Ver la hoja de datos (PDF) - Cirrus Logic

Número de pieza

componentes Descripción

Fabricante

CS8920A

Crystal LAN ISA Plug-and-Play Ethernet Controller

Cirrus Logic 

CS8920A

• On-chip 10BASE-T filters allow designers to

use simple isolation transformers instead of

more costly filter/transformer packages.

• The serial EEPROM port, used for configu-

ration and initialization, eliminates the need

for expensive switches and jumpers.

• The CS8920A is designed to be used on a

2-layer circuit board instead of a more ex-

pensive multi-layer board.

• The CS8920A-based solution offers the

smallest footprint available, saving valuable

printed circuit board area.

• A set of certified software drivers is available

at no charge, eliminating the need for costly

software development.

High Performance

The CS8920A is a full 16-bit Ethernet controller

designed to provide optimal system performance

by minimizing time on the ISA bus and CPU

overhead per frame. It offers equal or superior

performance for less money when compared to

other Ethernet controllers. The CS8920A’s Pack-

etPage architecture allows software to select

whichever access method is best suited to each

particular CPU/ISA-bus configuration. When

compared to older I/O-space designs, PacketPage

is faster, simpler and more efficient.

To boost performance further, the CS8920A in-

clude several key features that increase

throughput and lower CPU overhead, including:

• StreamTransfer cuts up to 87% of interrupts

to the host CPU during large block transfers.

• Auto-Switch DMA allows the CS8920A to

maximize throughput while minimizing

missed frames.

• Early interrupts allow the host to preprocess

incoming frames.

• On-chip buffering of full frames cuts the

amount of host bandwidth needed to manage

Ethernet traffic.

Low Power and Low Noise

For low power needs, the CS8920A offers three

power-down options: Hardware Standby, Hard-

ware Suspend, and Software Suspend. In

Standby mode, the chip is powered down with

the exception of the 10BASE-T receiver, which

is enabled to listen for link activity. In either

Hardware or Software Suspend mode, the re-

EEPROM

20 MHz

XTAL

’245

Boot PROM

CS8920A

LED

RJ-45

Attachment

Unit

Interface

(AUI)

Figure 1.2. Full-Featured ISA Adapter Solution

6

DS238PP1

Share Link: