TNETX3270 datasheet(6/66 Pages) TI1

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TNETX3270

ThunderSWITCH

™ 24/3 ETHERNET™ SWITCH

WITH 24 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS

SPWS043B – NOVEMBER 1997 – REVISED APRIL 1999

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

Terminal Functions

10-Mbit/s MAC multiplexed interface (ports 00–23) is multiplexed into three groups (TH0, TH1, and

TH2) of eight ports†

TERMINAL

I/O

INTERNAL

DESCRIPTION

NAME

NO.

I/O

RESISTOR‡

DESCRIPTION

TH0CLK

TH1CLK

TH2CLK

222

Pullup

Interface clock. Eight ports are supported on each interface and use this common 20-MHz

clock.

TH0COL

TH1COL

TH2COL

223

Pulldown

Interface collision sense. Assertion of THxCOL† during half-duplex operation indicates

network collision on the current port. Additionally, during full-duplex operation, transmission

of new frames does not start if this terminal is asserted.

TH0CRS

TH1CRS

TH2CRS

224

Pulldown

Interface carrier sense. THxCRS† indicates a frame carrier signal is being received on a

current port.

TH0LINK

TH1LINK

TH2LINK

232

Pulldown

Interface link presence. THxLINK† indicates the presence of the connection on a port.

– Low = no link

– High = link good

TH0RENEG

TH1RENEG

TH2RENEG

213

233

None

Interface renegotiate. A 1-0-1 sequence output on THxRENEG causes flow control and

half/full duplex for a port to be renegotiated with its companion physical-layer (PHY) device.

These THxRENEG terminals connect to IFFORCEHD on TNETE2008.

TH0RXD3

TH0RXD2

TH0RXD1

TH0RXD0

TH1RXD3

TH1RXD2

TH1RXD1

TH1RXD0

TH2RXD3

TH2RXD2

TH2RXD1

TH2RXD0

231

230

228

227

Pullup

Interface receive data. The receive data nibble from the current port is synchronous to

THxCLK. When the THxRXDV signal is 1, the receive data terminals contain valid information.

THxRXD0 is the least significant bit and THxRXD3 is the most significant bit. These signals

also are used to report the channel state to the MAC.

TH0TXEN

TH1TXEN

TH2TXEN

219

240

None

Interface transmit enable. THxTXEN indicates valid transmit data on THxTXD.

TH0SYNC

TH1SYNC

TH2SYNC

221

Pullup

Interface synchronize. THxSYNC is used to synchronize the port traffic between the

media-access controller (MAC) and PHY. When THxSYNC is a 1, the current MAC-to-PHY

path is the multiplexer interface TH0, and the PHY-to-MAC path is the multiplexer interface

TH2. THxSYNC is sampled by the MAC on the falling edge of THxCLK.

† THx = TH0, TH1, and TH2

‡ Internal resistors are provided to pull signals to known values. System designers should determine if additional pullups or pulldowns are required

in their system.

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