CS8900A-CQ3Z datasheet(10/138 Pages) CIRRUS

部件名	CS8900A-CQ3Z

功能描述	Crystal LAN ??ISA Ethernet Controller

Download	138 Pages

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制造商	CIRRUS [Cirrus Logic]

网页	http://www.cirrus.com

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10 / 138 page

10

DS271F4

CS8900A

Crystal LAN™ Ethernet Controller

CIRRUS LOGIC PRODUCT DATASHEET

•

On-chip LED ports can be used for either

optional LEDs, or as programmable out-

puts.

1.3 Key Features and Benefits

1.3.1 Very Low Cost

The CS8900A is designed to provide the low-

est-cost Ethernet solution available for embed-

ded applications, portable motherboards, non-

ISA bus systems and adapter cards. Cost-sav-

ing features include:

•

Integrated RAM eliminates the need for ex-

pensive external memory chips.

•

On-chip 10BASE-T filters allow designers

to use simple isolation transformers in-

stead 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 CS8900A is designed to be used on a

2-layer circuit board instead of a more ex-

pensive multilayer board.

•

The 8900A-based solution offers the small-

est footprint available, saving valuable

printed circuit board area.

•

A set of certified software drivers is avail-

able at no charge, eliminating the need for

costly software development.

1.3.2 High Performance

The CS8900A is a full 16-bit Ethernet control-

ler designed to provide optimal system perfor-

mance by minimizing time on the ISA bus and

CPU overhead per frame. It offers equal or su-

perior performance for less money when com-

pared to other Ethernet controllers. The

CS8900A’s PacketPage 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 CS8900A

includes several key features that increase

throughput and lower CPU overhead, includ-

ing:

•

StreamTransfer cuts up to 87% of inter-

rupts to the host CPU during large block

transfers.

•

Auto-Switch DMA allows the CS8900A to

maximize throughput while minimizing

missed frames.

•

Early interrupts allow the host to prepro-

cess incoming frames.

•

On-chip buffering of full frames cuts the

amount of host bandwidth needed to man-

age Ethernet traffic.

1.3.3 Low Power and Low Noise

For low power needs, the CS8900A offers

three power-down options: Hardware Stand-

by, Hardware Suspend, and Software Sus-

pend. In Standby mode, the chip is powered

down with the exception of the 10BASE-T re-

ceiver, which is enabled to listen for link activ-

ity. In either Hardware or Software Suspend

mode, the receiver is disabled and power con-

sumption drops to the micro-ampere range.

In addition, the CS8900A has been designed

for very low noise emission, thus shortening

the time required for EMI testing and qualifica-

tion.

1.3.4 Complete Support

The CS8900A comes with a suite of software

drivers for immediate use with most industry

standard network operating systems. In addi-

tion, complete evaluation kits and manufactur-

ing packages are available, significantly

reducing the cost and time required to produce

new Ethernet products.

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