STE10A datasheet(27/82 Pages) STMICROELECTRONICS

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STE10/100A

Functional description

27/82

3.6

LED display operation

The STE10/100A provides 2 LED display modes; the detailed descriptions of their operation

are described in the pin description section.

First mode – 3 LED displays

–

100Mbps (on) or 10Mbps (off)

–

Link (Remains on when link ok) or activity (Blinks at 10Hz when receiving or

transmitting collision-free)

–

FD (Remains on when in full duplex mode) or collision (Blinks at 20Hz when

collisions detected)

Second mode – 4 LED displays

–

100 Link (On when 100M link ok)

–

10 Link (On when 10M link ok)

–

Activity (Blinks at 10Hz when receiving or transmitting)

–

FD (Remains on when in full duplex mode) or collision (Blinks at 20Hz when

collisions detected)

3.7

Reset operation

3.7.1

Reset whole chip

There are two ways to reset the STE10/100A:

–

Hardware reset

Via RST# pin (to ensure proper reset operation, the RST# signal should be

asserted at least 100ms)

–

Software reset

Via SWR (bit 0 of CSR0) being set to 1 (the STE10/100A will reset all circuits

except the transceivers and configuration registers, set registers to their default

values, and will clear SWR) and set XRST(XR0, bit 15) to reset the transceivers.

3.7.2

Reset transceiver only

When XRST (bit 15 of XR0) is set to 1, the transceiver will reset its circuits, will initialize its

registers to their default values, and clear XRST.

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