TNETX3150 datasheet(101/113 Pages) TI1

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TNETX3150/TNETX3150A

ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997

101

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

LED timing (see Figure 42)

300 ns

600 ns

300 ns

LEDCLK

(output)

LEDSTR0

(output)

LEDDATA

(output)

600 ns

Port

Reserved

a) LED-STATUS INTERFACE

300 ns

600 ns

300 ns

LEDCLK

(output)

LEDSTR1

(output)

LEDDATA

(output)

600 ns

Port

Reserved

b) TRANSMIT-QUEUE-STATUS INTERFACE

Port

Figure 42. LED- and Transmit-Queue-Status Interface Timing

The LEDSTR1 signal is pulsed only when there has been a change in status for any of the transmit queues.

An external system monitoring this signal can use it as a trigger to investigate which transmit queue is congested

or has recovered from congestion.

During hardware reset, the TNETX3150/TNETX3150A turns on the LEDs attached to it to indicate that the

TNETX3150/TNETX3150A is in reset. The LEDCLK is free running, LEDSTR0 and LEDSTR1 are held high,

and LEDDATA is taken low.

With LEDSTR0 and LEDSTR1 high, the LED latch is transparent and the LEDs are illuminated.

When RESET is released, a normal LED cycle is initiated with LEDDATA held low and LEDSTR0 pulsed. The

LEDs remain on until the start bit is set (an LED cycle updating LEDSTR1 is not performed).

When the START option bit is set, the TNETX3150/TNETX3150A initiates another LED cycle with LEDDATA

held high, extinguishing the LEDs.

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