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LXT9883/9863 — Advanced 10/100 Unmanaged Repeater

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

3.6.6.3

LED Mode 3

Mode 3 operations are described in Table 13.

Table 12. LED Mode 2 Indications

LED

Operating

Mode

Hardware Control

Blink

Off

PORTnLED1

Any

10M: Port_Enabled,

Link_OK, not

Port_Partitioned

100M: Port_Enabled,

Link_OK, not

Port_Partitioned

10M: Port_Enabled,

Link_OK, and

Port_Partitioned (slow

blink)

100M: Port_Enabled,

Port_Partitioned

(Slow Blink)

Any other state

PORTnLED2

Rcv_Activity

(20 ms pulse)

N/A

Any other state

PORTnLED3

AUTOBLINK active

100M Link_OK

No Link_OK

(Fast Blink)

10M Link_OK

AUTOBLINK inactive

N/A

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 LXT98x3

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 LXT98x3

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

any additional activity is ignored by the activity LED logic.

RPS Fault

Any

PRS_Present, no

RPS_Fault

PRS_Present,

RPS_Fault

(Slow Blink)

Not RPS_Present

Global Fault

Any

N/A

Any Port_Partitioned,

any Port Isolated

RPS_Fault and

RPS_Present

(Slow Blink)

Any other state

1. Refer to Table 10: 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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