Preliminary Data Sheet

AL2100

11/11/02

Broa d c om Co rp o r a ti o n

Document

AL2100-DS01-405-R

Fault Propagation

ones followed by a zero). When the AL2100 receives the far-end fault signal, it is notified by the far-end station that a

transmit-fault occurred. The device goes into a link-down state, and takes the following actions:

•

Puts the TXP and TXN pins in high-impedance mode

•

De-asserts the DATA_OFF signal

The data transmission is assumed by the backup AL2100, and starts sending copies of the signals. Upon re-establishment

of the primary fiber, DATA_OFF is asserted, and the backup data link is turned off.

LED Output

All the LED pins in the AL2100 are multifunction I/Os. Their input is used in the reset-read operation for the secondary

definition. All LED pins have internal pull-ups. The ON output value depends on the reset-read value of the LED pin. When

the reset-read value is high, the default for all LED pins, the ON output value is low. When the reset read value is low, the

ON output value is high.

Default LED formats are given in Table 2.

These LEDs can be configured into different modes. To configure the LEDs to work with other operation mode other than

default mode, see ”LED Configuration” on page 10.

The AL2100 also support the following LEDs:

•

LED4_FDX: default defined as full-duplex of auto-negotiation resulting on the TP port.

•

LED_FX_SD: signal detects on Fiber PHY. This LED set by hardware pin 45 cannot be programmable.

•

LED_TX_SD: receiving energy detects on the TP port. This LED is set by hardware pin 19, and cannot be

programmable

Table 2: LED Formats

LED

Format

LED0

RxAct_TP (Blink)

LED1

Link_TP (ON)

LED2

RxAct_FX (Blink)

LED3

Link_FX (ON) / Remote_Fault (Blink)

LED4

DUPLEX_TP (ON)

Note

LED connections and the source/sink current depend on the default setting.