TNETE2201B

1.25-GIGABIT ETHERNET TRANSCEIVER

SLLS367A – JUNE 1999 – REVISED AUGUST 1999

2

POST OFFICE BOX 655303

description (continued)

The intended application of this device is to provide building blocks for developing point-to-point baseband data

transmission over controlled-impedance media of approximately 50

Ω to 75 Ω. The transmission media can be

printed-circuit board traces, back planes, cables, or fiber optical media. The ultimate rate and distance of data

transfer is dependent upon the attenuation characteristics of the media and the noise coupling to the

environment.

The TNETE2201B performs the data serialization and deserialization (SERDES) functions for the gigabit

ethernet physical layer interface. The transceiver operates at 1.25 Gbps (typical), providing up to 1000 Mbps

of bandwidth over a copper or optical media interface. The serializer/transmitter accepts 8b/10b parallel

encoded data bytes. The parallel data bytes are serialized and transmitted differentially nonreturn-to-zero

(NRZ) at pseudo-ECL (PECL) voltage levels. The deserializer/receiver extracts clock information from the input

serial stream and deserializes the data, outputting a parallel 10-bit data byte. The 10-bit data bytes are output

with respect to two receive byte clocks (RBC0, RBC1), allowing a protocol device to clock the parallel bytes in

RBC clock rising edges.

The transceiver automatically locks onto incoming data without the need to prelock. However, the transceiver

can be commanded to lock to the externally supplied reference clock (REFCLK) as a reset function, if needed.

The TNETE2201B provides an internal loopback capability for self-test purposes. Serial data from the serializer

is passed directly to the deserializer allowing the protocol device a functional self-check of the physical interface.

The TNETE2201B is characterized for operation from 0

°C to 70°C.