TNETE2008

OctalPHY

EIGHT 10BASE-T PHYSICAL-LAYER INTERFACES

SPWS042B – DECEMBER 1997 – REVISED JUNE 1998

1

POST OFFICE BOX 655303

(PHY) Interfaces for Internetworking

Applications

Simultaneous Transmit and Receive

Specification

Transmit Circuits

– No External Filters Are Required

– Meets IEEE Std 802.3 (Section 14.3)

Electrical Requirements

to Establish the Highest Common Protocol

Model (HBM) Protection 1.5 kV Per JEDEC

JESD22-A114A

Digital Phase-Locked Loop (PLL)

Channels Using Digital PLL

Per-Channel-Pair Frequency Mismatch

Across All Eight Channels (IEEE Std 802.3,

Sec 7.3.2)

Threshold

Electromagnetic Interference (EMI)

Correction

LED Status Indicators

Consumption

(TAP)

Magnetics

(PQFP)

description

The TNETE2008 OctalPHY is a physical-layer (PHY) interface device for up to eight 10BASE-T networks using

a multiplexed medium access controller (MAC) interface compatible with TNETX3110, TNETX3151,

TNETX3190, or TNETX3270 switch devices, or equivalent. A digital-signal-processor (DSP)-based

phase-locked loop (PLL) is used on each channel to recover data. Integrated wave shaping of the output

eliminates the need for filters to meet electromagnetic interference (EMI) testing. DSP-based wave-shaping

techniques used internally reduce the required number of external components to a coupling transformer, four

resistors, and a capacitor per channel. The multiplexed host interface reduces the number of terminals required

to connect eight networks to eight MAC engines, allowing the use of a single package.

The TNETE2008 operation is fully automatic. It can be taken from reset to full operation without parameter

downloads or interaction with a host central processing unit (CPU). Some mode terminals affect all of the ports,

such as looping back transmit data to the receive path, powering down the PHY, and setting the receiver

threshold. There are no management interfaces or internal registers on this device. A directly driven LED matrix

provides Ethernet

™ status indicators, i.e., link, activity, collision, and duplex. The TNETE2008 produces and

receives IEEE Std 802.3-compliant waveforms when coupled to the network with a suitable transformer. The

TNETE2008 also incorporates a JTAG-compliant test port.

Copyright

© 1998, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

† IEEE Std 1149.1-1990, IEEE Standard Test-Access Port and Boundary-Scan Architecture

Ethernet is a trademark of Xerox Corporation.