TNETX3150 datasheet(61/113 Pages) TI1

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TNETX3150/TNETX3150A

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

SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

read cycle timing (continued)

Data

Slave Address

EDIO

DIO

Interface

24C02

a) Current Address Read

Word Address

Slave Address

EDIO

DIO

Interface

24C02

Data n

Slave Address

b) Random Read

Data n + x

Data n + 1

Slave

Address

EDIO

24C02

Data n + 2

Data n + 1

c) Sequential Read

DIO

Interface

Figure 21. Typical Read Operations

LED interface

LED interface allows a visual status for each port to be displayed (see Figure 22). The data supplied is

multiplexed between port status and transmit queue congestion information. The data type is determined by

the two strobe signals. Port status information is latched on the LEDSTR0 signal. Transmit queue congestion

information is latched on the LEDSTR1 signal.

The LED port status output is driven low when the port state is suspended or disabled, except where suspension

is caused by link loss. During normal operation, the output is high. The transmit queue congestion status is

driven low when the transmit queue length has become negative for a port (indicating no further frames can be

queued). For uncongested operation, the latched output is high. The LEDDATA is active low for simplified

implementations using standard TTL parts. During hardware reset, the TNETX3150/TNETX3150A turns on the

LEDs attached to it to provide indication that the TNETX3150/TNETX3150A is in reset. The LEDCLK is free

running, LEDSTR0 and LEDSTR1 are held high, and LEDDATA is taken low.

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