AR8327-AL1A-R datasheet(37/394 Pages) ETC2

37 / 394 page

Atheros Communications, Inc.

AR8327/AR8327N Seven-port Gigabit Ethernet

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37

2.9 LED Control

There are totally 6 Led control rules. Three of them are used to control the LEDs of PHY 0 to PHY 3.

The others are used to control the LEDs of PHY4. Each port has 3 LEDs, the default behavior of the

LEDs are 1000_link_activity, 100_link_activity and 10_link_activity. The LED output is open-drain

output type. So two or three of them can be connected together to indicate OR operation of the original

LEDs. To achieve this operation, another way is to modify the LED control register. These LEDs also

can be individually configured on or off by register.

Each LED can be controlled by 16-bits shown in the following table.

Table 2-21.

LED Control

Bit

Name

Description

15:14

PATTERN_EN

2’b00: LED always off

2’b01: LED blinking at 4 Hz

2’b10: LED always on

2’b11: LED controlled by the following bits

FULL_LIGHT_EN

1’b1: LED will light when link up in full-duplex

HALF_LIGHT_EN

1’b1: LED will light when link up at half-duplex

POWER_ON_LIGHT_EN

1’b1: module should enter POWER_ON_RESET

status after reset.

LINK_1000M_LIGHT_EN

1’b1: LED will light when link up at 1000 Mbps

LINK_100M_LIGHT_EN

1’b1: LED will light when link up at 100 Mbps

LINK_10M_LIGHT_EN

1’b1: LED will light when link up at 10 Mbps

COL_BLINK_EN

1’b1: LED will blink when collision is detected

Reserved

Must be 1’b0

RX_BLINK_EN

1’b1: LED will blink when receiving frame

TX_BLINK_EN

1’b1: LED will blink when transmitting frame

Reserved

Must be 1’b0

LINKUP_OVER_EN

1’b1: RX/TX blinking should check with LINKUP

speed, LINKUP LED is ON, allow blinking.

Otherwise, OFF

1’b0: RX/TX blinking will ignore the LINKUP speed.

1:0

LED_BLINK_FREQ

LED blink frequency select

2’b00: 2 HZ

2’b01: 4 Hz

2’b10: 8 Hz

2’b11: if link up at 1000Mbps, 8 Hz

if link up at 100Mbps, use 4 Hz

if link up at 10 Mbps, use 2 Hz

Table 2-22.

LED Rule Default Value

Bit

Name

LED_RULE_0/1 LED_RULE_2/3 LED_RULE_4/5

Default Value

0xCC35

0xCA35

0xC935

15:14

PATTERN_EN

2’b11

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