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LXT9883/9863 — Advanced 10/100 Unmanaged Repeater

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

There are two display modes for the activity bar graphs, Base-2 and Base-10. The modes are

selected via the LEDABGSEL pin. Refer to Table 9 for details. Each step LED on the bar graph is

lit when the percent activity value associated with that step is met or exceeded.

3.6.5

Direct Drive LEDs

The LXT98x3 provides three direct drive LEDs for each port (PORTn_LED1:3), excluding the two

MII ports. Four additional segment LEDs indicate Collision 10/100 and Activity 10/100.) The per-

port LEDs are updated simultaneously to illustrate clear, non-overlapping status.

The following device pins are multifunctional (input = configuration; output = LED driver):

COL10_LED (185), ACT10_LED (183), ACT100_LED (184), and, PORT8_LED2 (175).

The drive level is determined by the particular input configuration function of the respective pin.

Collision and Activity indications for both 10M and 100M segments are available in both serial

and direct drive.

3.6.6

LED Modes

The four available LED modes are described in Table 11 - Table 15. Hardware pins provide global

LED mode control. Refer to Table 5 on page 14 for pin assignments and signal description. Table

10 defines terms used to describe LED operation.

Table 9.

ACTGLED Display Modes

LED

LEDABGSEL = 0

(Base-10)

LEDABGSEL = 1

(Base-2)

ACTG 8

60+% Activity

80+% Activity

ACTG 7

50% Activity

64% Activity

ACTG 6

40% Activity

32% Activity

ACTG 5

30% Activity

16% Activity

ACTG 4

20% Activity

8% Activity

ACTG 3

10% Activity

4% Activity

ACTG 2

5% Activity

2% Activity

ACTG 1

1% Activity

Table 10. LED Terms

Term

Definition

Port_Enabled

True if port is enabled.

Link_OK

True if link is enabled and link is detected. Always true for MII port.

Port_Partitioned

True if port has been auto partitioned (10Mb mode).

True if port has been auto partitioned or isolated (100Mb mode).

Port_Is_TP

True if port is a twisted-pair port.

RPS_Present

True if redundant power supply is switched in.

RPS_Fault

True if redundant power supply has a fault.

Rcv_Activity

True if twisted-pair port on this device is receiving a packet.

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