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Texas Instruments THUNDER TNETX3270 User Manual

Page 33

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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

33

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

Pause (0 = no pause)

Half Duplex

Half Duplex

(0 = full duplex)

Autonegotiation Begins

Link Good

(0 = full duplex)

TNETE2008 latches final values,
just before autonegotiation the
fast-link pulse exchange begins.

1200-ms Min

80-ms Min

750-ms Min

Clock Runs Continuously

THxTXEN

(output)

THxCLK

(input)

THxTXD3

(output)

THxTXD2

(output)

THxTXD1

(output)

THxTXD0

(output)

THxLINK

(input)

THxRXDV

(input)

THxRXD3

(input)

THxRENEG

(output)

THxRXD2

(input)

THxRXD1

(input)

THxRXD0

(input)

Will be 0

Will be 0

Will be 0

(1 = pause granted)

(1 = half duplex)

(1 = pause granted)

THxCLK

(input)

THxLINK

(input)

THxRXDX

(input)

THxRXD

Final Value

THxLINK = 1
(THxRXD final value latched)

Must be 0

(1 = pause requested)

Must be 0

Will be 0

Link Fails OR

Renegotiation

Negotiated
Link Protocol

Latch Final
Values
When Link

Pause (0 = no pause)

Figure 7. Connecting to TNETE2008 PHY

† THx = TH0, TH1, and TH2