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Advanced 10/100 Unmanaged Repeater — LXT9883/9863

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

3.6.4.1

Serial LED Signals

The LED serial interface bus consists of three LXT98x3 outputs: clock (LEDCLK), parallel load

clock (LEDLAT), and output data (LEDDAT). Refer to Table 5 on page 14 for signal descriptions

and to Figure 14 on page 40 for an illustration of the LED serial interface circuit. Refer to Figure 6

and Table 8 for details on the LED serial bit stream.

3.6.4.2

Activity Graph LEDs

The ACTGLED10 and ACTGLED100 LEDs are for activity bar graphing. The activity

information is integrated and updated over a period of 328.125ms, which has the effect of

smoothing out the activity. LEDs are provided for both the 10 Mbps and 100 Mbps segments.

Figure 6. Serial LED Port Signaling

Table 8.

Serial LED Port Bit Stream

Bit

MII Ports-LED1, 2, 3

Misc.

ACTGLED10

ACTGLED100

MII Port 1 - LED1

Collision - 10M

ACTG8

MII Port 1 - LED2

Collision - 100M

ACTG7

MII Port 1 - LED3

Not Used

ACTG6

MII Port 2 - LED1

Activity - 10M

ACTG5

MII Port 2 - LED2

Activity - 100M

ACTG4

MII Port 2 - LED3

Global Fault

ACTG3

Not Used

ACTG2

Not Used

RPS Fault

ACTG1

1. These LEDs are multiplexed with Configuration Inputs.

LEDDAT

MII PORTS-LED1,2,3

Misc. LEDs

ACTGLED10

ACTGLED100

Time

LEDLAT

LEDDAT

LEDLAT

LEDCLK

Qa’-Qh’ (‘595)

Qa-Qh (‘164)

b0, b7-b1

b1, b0, b7-b2

b2-b0, b7-b3

b3-b0, b7-b4

b4-b0, b7-b5

b5-b0, b7-b6

b6-b0, b7

b7-b0

Qa-Qh

(‘595)

b7-b0

LEDDAT

LEDLAT

LEDCLK

122

µs

100 ns / 10 MHz

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