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CS8904

Crystal LAN™ Quad Ethernet Transceiver

Cirrus Logic 

CS8904

Crystal LAN™ Quad Ethernet Transceiver

If the remote device supports Auto-Negotiation,

but does not share a compatible set of capabilities

with the CS8904, then the CS8904 will indicate

that the Auto-Negotiation was unsuccessful and

that the link is failed through the Auto-Negotiation

output and the Link Status LED output. Auto-

negotiation may also fail if the CS8904 is unable to

exchange a Link Code Word with the remote

device.

When Auto-Negotiation is disabled, the CS8904

sends Normal Link Pulses to the remote Ethernet

device.

3.3.3.3 Receive Polarity Detection and Correction

The CS8904 checks the polarity of the receive half

of the twisted pair cable and automatically corrects

a reversal.

To detect a reversed pair, the receiver examines

received link pulses and the End-of-Frame (EOF)

sequence of incoming packets. If it detects at least

one reversed link pulse and at least four frames in a

row with negative polarity after the EOF, the

receive pair is considered reversed. Any data

received before the correction of the reversal is

ignored.

3.3.4 Collision Detection

If half duplex operation is selected, the CS8904

detects a 10BASE-T collision whenever the

receiver and transmitter are active simultaneously.

When a collision is present, the collision detection

circuit informs the digital controller by asserting

the collision signal. If full duplex operation is

selected, the collision detection circuit is disabled.

CIRRUS LOGIC ADVANCED PRODUCT DATABOOK

DS191PP2

15

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