CS8920A Просмотр технического описания (PDF) - Cirrus Logic

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CS8920A

Crystal LAN ISA Plug-and-Play Ethernet Controller

Cirrus Logic 

CS8920A

ceiver is disabled and power consumption drops

to the micro-Amp range.

In addition, the CS8920A has been designed for

very low noise emission, thus shortening the

time required for EMI testing and qualification.

Complete Support

The CS8920A comes with a suite of software

drivers 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.

1.4 Enhancements Made in CS8920A

The functional enhancements made to the

CS8920A include the following:

The FDX_LED pin of the CS8920 has been red-

fined as the local-LAN-activity LED on the

CS8920A. The LOCALLED will light when

one of two events occurs:

• the CS8920A transmits onto the network, or

• the CS8920A receives a frame from the net-

work and that frame is addressed to this

station (i.e., the frame’s address passes the

CS8920A’s address filter).

The Plug and Play standard provides for an Aux-

illary Key which is normally used for testing

purposes or to program the EEPROM. The

CS8920A will respond to the Auxillary Key at

any time. The CS8920 responded to the Auxil-

lary Key only if Plug and Play was enabled, or if

the CS8920 had detected that the EEPROM con-

tained a bad CRC value. This meant that the

CS8920 would ignore the Auxillary Key in non-

Plug and Play mode as long as the CRC was

valid.

To support software compatibility with existing

device drivers, the CS8920A’s Product Identifi-

cation Code register has the same Product ID

Number as the CS8920. The CS8920A’s revi-

sion number has been incremented.

The CS8920A has added the EWAKE pin to the

boundary scan.

8

DS238PP1

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