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Preliminary Data Sheet

September 2000

3X38FTR 208-Pin SQFP

OCTAL-FET (Fast Ethernet Transceiver) for 10Base-T/100Base-TX/FX

Overview

The 3X38FTR 208-Pin SQFP is an eight-channel,

single-chip complete transceiver designed specifi-

cally for dual-speed 10Base-T, 100Base-TX, and

100Base-FX switches and repeaters. It supports

simultaneous operation in three separate

IEEE

*

standard modes: 10Base-T, 100Base-TX, and

100Base-FX. The 3X38 uses 0.25

碌m

low-power

CMOS to achieve extremely low power dissipation

and operates from a single 3.3 V power supply.

Each channel implements the following:

s

s

s

s

s

s

s

Autopolarity detection and correction.

Adjustable squelch level for extended line length

capability (two levels).

On-chip filtering eliminates the need for external

filters.

Half- and full-duplex operations.

s

s

100 Mbits/s TX Transceiver

s

10Base-T transceiver function of

IEEE

802.3.

100Base-TX transceiver function of

IEEE

802.3u.

100Base-FX transceiver function of

IEEE

802.3u.

s

s

Compatible with

IEEE

802.3u PCS (clause 23),

PMA (clause 24), autonegotiation (clause 28), and

PMD (clause 25) specifications.

Compatible with the reduced MII (RMII) specifica-

tion of the RMII consortium version 1.2.

Selectable 7-pin RMII, 2-pin SMII (serial MII).

Scrambler/descrambler bypass.

Selectable carrier sense signal generation (CRS)

asserted during either transmission or reception in

half duplex (CRS asserted during reception only in

full duplex).

Full- or half-duplex operations.

On-chip filtering and adaptive equalization that

eliminates the need for external filters.

Autonegotiation of

IEEE

802.3u.

s

MII management of

IEEE

802.3u.

s

The 3X38 supports operations over two pairs of

unshielded twisted-pair (UTP) cable (10Base-T and

100Base-TX) and over fiber-optic cable (100Base-

FX).

s

It has been designed with a flexible system interface

that allows configuration for optimum performance

and effortless design. The individual per-port system

interface can be configured as 10 Mbits/s, or

100 Mbits/s reduced MII (RMII), or 10 Mbits/s, or

100 Mbits/s serial MII (SMII).

s

100 Mbits/s FX Transceiver

s

Features

s

Pseudo-ECL compatible input/output for 100Base-

FX support (with fiber-optic signal detect).

Compatible with

IEEE

802.3u 100Base-FX stan-

dard.

Reuses existing twisted-pair I/O pins for compati-

ble fiber-optic transceiver pseudo-ECL (PECL)

data:

鈥?No additional data pins required.

鈥?Reuses existing 3X38 pins for fiber-optic

signal detect (FOSD) inputs.

10 Mbits/s Transceiver

s

s

Compatible with

IEEE

802.3 10Base-T standard

for category 3 unshielded twisted-pair (UTP) cable.

Compatible with the reduced MII (RMII) specifica-

tion of the RMII consortium version 1.2.

Selectable 7-pin RMII or 2-pin serial MII (SMII).

s

s

*

IEEE

is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.

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• 3X38FTR
  英文版
  OCTAL-FET (Fast Ethernet Transceiver) for 10Base-T/100Base-T...
  AGERE
  3X38FTR
• 3X38FTR
  英文版
  OCTAL-FET (Fast Ethernet Transceiver) for 10Base-T/100Base-T...
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