LAN8818D datasheet(64/101 Pages) MICROCHIP

64 / 101 page

LAN8818D

DS00005832C-page 64

5.19

LEDs

The device provides eight programmable LEDs, two per port (PORT[0:3]LED[1:2]), which are configurable to support

multiple LED modes. The LED mode is configured by the LED_MODE configuration strap as well as port-specific

instances of the LED Control Register 1 and 2. All eight LEDs are configured with identical behavior via the LED_MODE

configuration strap. Port-specific LED configuration can be accomplished via the LED Control Register 1 and 2. The

supported LED modes are:

• Individual-LED Mode (LED Control Register 1, bit[6] (KSZ0931 LED mode) = ‘1’, LED_MODE pulled-up)

• Tri-color-LED Mode (LED Control Register 1, bit[6] (KSZ0931 LED mode) = ‘1’, LED_MODE pulled-down)

• Enhanced LED Mode (LED Control Register 1, bit[6] (KSZ0931 LED mode) = ‘0’, LED_MODE unused)

To use LEDs, they must be enabled as GPIOs and GPIO Alternate Functions. The GPIOs must be configured as Out-

puts, and the proper output driver type selected (open-drain or push-pull). If open-drain type is selected, the output driver

will automatically choose between open-source and open-drain based on LED polarity.

The PORT[3:0]_LED[2:1]_POL configuration straps set the default polarity of the LED pins. Refer to Section 3.3.4, "LED

Polarity (PORT[3:0]_LED[2:1]_POL)" for additional LED polarity information. Refer to Section 3.3.3, "LED Mode Select

(LED_MODE)" for additional LED_MODE information.

5.19.1

INDIVIDUAL-LED MODE

In Individual-LED mode, the PORTxLED2 pin indicates the link status while the PORTxLED1 pin indicates the activity

status, as shown in Table 5-9.

5.19.2

TRI-COLOR-LED MODE

In Tri-color-LED mode, the link and activity status are indicated by the PORTxLED2 pin for 1000BASE-T; by the PORTx-

LED1 pin for 100BASE-TX; and by both PORTxLED2 and PORTxLED1 pins, working in conjunction, for 10BASE-T.

This is summarized in Table 5-10.

Note:

The LEDs are forced off when any of the following occurs:

• The Isolate (PHY_ISO) bit in the Basic Control register is set.

• The Power Down bit in the Basic Control register is set.

TABLE 5-9:

INDIVIDUAL-LED MODE OPERATION

PORTxLED2

PORTxLED1

Definition

Inactive

No link

Active

Inactive

Link any speed, no activity

Active

Blinking

Link any speed, TX or RX activity

Other States

N/A

Note:

The LEDs are forced off when any of the following occurs:

• The Isolate (PHY_ISO) bit in the Basic Control register is set.

• The Power Down bit in the Basic Control register is set.

LAN8818D Datasheet(PDF) 64 Page - Microchip Technology

LAN8818D Datasheet(HTML) 64 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL