CS8900-CQ 查看數據表（PDF） - Cirrus Logic

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CS8900-CQ

Highly-Integrated ISA Ethernet Controller

Cirrus Logic 

CS8900

• On-chip LED ports can be used for either

optional LEDs, or as programmable outputs.

1.3 Key Features and Benefits

Very Low Cost

The CS8900 is designed to provide the lowest-

cost Ethernet solutions available for ISA desktop

motherboards, portable motherboards, and

adapter cards. Cost-saving 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 instead of

more costly filter/transformer packages.

• The serial EEPROM port, used for configura-

tion and initialization, eliminates the need for

expensive switches and jumpers.

• The CS8900 is designed to be used on a 2-

layer circuit board instead of a more

expensive multi-layer board.

• The 8900-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 CS8900 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 CS8900’s Pack-

etPage architecture allows software to select

whichever access method is best suited to each

particular CPU/ISA-bus configuration. When

6

compared to older I/O-space designs, PacketPage

is faster, simpler and more efficient.

To boost performance further, the CS8900 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 CS8900 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 CS8900 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-

ceiver is disabled and power consumption drops

to the micro-ampere range.

In addition, the CS8900 has been designed for

very low noise emission, thus shortening the

time required for EMI testing and qualification.

Complete Support

The CS8900 comes with a suite of software driv-

ers for immediate use with most industry

standard network operating systems. In addition,

complete evaluation kits and manufacturing

packages are available, significantly reducing the

cost and time required to produce new Ethernet

products.

DS150PP2

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