ICS1893 datasheet(35/152 Pages) ICST

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Chapter 6

Interface Overviews

ICS1893 Rev C 6/6/00

June, 2000

ICS1893 - Release

6.8

Status Interface

The ICS1893 LSTA pin provides a Link Status, and its LOCK pin provides a Stream Cipher Locking Status.

In addition, as listed in Table 6-3, the ICS1893 provides five multi-function configuration pins that report the

results of continual link monitoring by providing signals that are intended for driving LEDs. (For the pin

numbers, see Table 9.3.2.)

Note:

During either a power-on reset or a hardware reset, each multi-function configuration pin is an input

that is sampled when the ICS1893 exits the reset state. After sampling is complete, these pins are

output pins that can drive status LEDs.

A software reset does not affect the state of a multi-function configuration pin. During a software reset,

all multi-function configuration pins are outputs.

Each multi-function configuration pin must be pulled either up or down with a resistor to establish the

address of the ICS1893. LEDs may be placed in series with these resistors to provide a designated

status indicator as described in Table 6-3.

Caution:

All pins listed in Table 6-3 must not float.

As outputs, the asserted state of a multi-function configuration pin is the inverse of the sense sampled

during reset. This inversion provides a signal that can illuminate an LED during an asserted state. For

example, if a multi-function configuration pin is pulled down to ground through an LED and a

current-limiting resistor, then the sampled sense of the input is low. To illuminate this LED for the

asserted state, the output is driven high.

Adding 10K

Ω resistors across the LEDs ensures the PHY address is fully defined during slow VDD

power-ramp conditions.

PHY address 00 tri-states the MII interface. (Do not select PHY address 00 unless you want the MII

tri-stated.)

Table 6-3.

Pins for Monitoring the Data Link

LED Driven by the Pin’s Output Signal

P0AC

AC (Link Activity) LED

P1CL

CL (Collisions) LED

P2LI

LI (Link Integrity) LED

P3TD

TD (Transmit Data) LED

P4RD

RD (Receive Data) LED

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