9880 datasheet(45/118 Pages) INTEL

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Advanced 10/100 Repeater with Integrated Management — LXT9860/9880

Datasheet

Document #: 248987

Revision#: 003

Rev Date: 08/07/01

3.7.6.2

LED Mode 2

Mode 2 operations are described in Table 16.

Table 16. LED Mode 2 Indications

LED

Operating

Mode

Hardware Control

Software

Control

Blink

Off

PORTnLED1

Any

10 Mbps:

Port_Enabled,

Link_OK, not

Port_Partitioned

100 Mbps:

Port_Enabled,

Link_OK, not

Port_Partitioned

10 Mbps:

Port_Enabled,

Link_OK, and

Port_Partitioned

(slow blink)

100 Mbps:

Port_Enabled,

Port_Partitioned

(Slow Blink)

Any other state

On, Off or

Fast Blink

via Port

LED

Control

PORTnLED2

Rcv_Activity

(20 ms pulse)

N/A

Any other state

N/A

PORTnLED3

Auto-

negotiate

enabled

AUTOBLINK

active

100 Mbps

Link_OK

No Link_OK

(Fast Blink)

10 Mbps

Link_OK

Off via Port

LED

Control

AUTOBLINK

inactive

N/A

Auto-negotiate disabled

100 Mbps mode

selected

(Link_Enabled)

10 Mbps mode

selected

(Link_Enabled)

Collision and

Activity LEDs

Any

The collision and activity LEDs are on a Per Segment

basis. Pulse stretchers are used to extend the on-

time for the LEDs. For every on-cycle of the stretched

LEDs, an off-cycle, with the same period as the on-

cycle, always follows.

The collision LEDs turn on for approximately 120

µs

when the LXT98x0 detects a collision on the

segments. During the time that the LED is on, any

additional collisions are ignored by the collision LED

logic.

The activity LEDs turn on for approximately 4 ms

when the LXT98x0 detects any activity on the

segments. During the time that the LED is on, any

additional activity is ignored by the activity LED logic.

N/A

Manager

Present

Any

N/A

Always Off

N/A

RPS

RPS_Present,

no RPS_Fault

RPS_Present,

RPS_Fault

(Slow Blink)

Not

RPS_Present

N/A

Global

FAULT

N/A

Any

Port_Partitioned,

any Port Isolated

RPS_Fault and

RPS_Present

(Slow Blink)

Any other state

On, off, or

slow blink

via global

LED

Control

1. Refer to Table 14: LED Terms, which defines all key terms used in this section.

2. Receive activity is stretched to a 20 ms wide pulse. For every on-cycle of the stretched LEDs, an off-cycle,

with the same period as the on-cycle, always follows.

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