LAN8808D datasheet(19/80 Pages) MICROCHIP

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LAN8808D

DS00005833C-page 19

LED Polarity

Configuration

Straps

PORT0_LED1_POL

PORT0_LED2_POL

PORT1_LED1_POL

PORT1_LED2_POL

PORT2_LED1_POL

PORT2_LED2_POL

PORT3_LED1_POL

PORT3_LED2_POL

VIS

Configures LED polarity as Active High or Active Low. Since

the LED pins are shared with configuration straps, the default

polarity of the LED pins is determined during strap loading.

If the strap value on a pin is a 0, the LED is set as active high

(PORTx_LEDy_POL = 1), since it is assumed that a LED to

ground is used as the pull-down.

Note:

When using a LED as a pull-down strap, an exter-

nal supplemental pull-down resistor may be

needed to ensure a valid low level.

If the strap value on a pin is 1, the LED is set as active low

(PORTx_LEDy_POL = 0), since it is assumed that a LED to

VDDIO is used as the pull-up.

Refer to Section 3.3.4, "LED Polarity

(PORT[3:0]_LED[2:1]_POL)" for additional information.

Device Mode

Configuration

Straps

MODE_SEL[4:0]

VIS

Configures the specific functional mode of all PHYs. The

MODE[4:0] configuration straps are sampled and latched at

power-up/reset and are defined in Section 3.3.1, "Device Mode

Select (MODE_SEL[4:0])".

LED Mode

Configuration

Strap

LED_MODE

VIS

Configures the device’s LED behavior as Individual or Tri-

Color. All 8 LEDs are configured with identical behavior. The

LED_MODE configuration strap is sampled and latched at

power-up/reset and is defined as follows:

0: Tri-color-LED mode

1: Individual-LED mode

Refer to Section 3.3.3, "LED Mode Select (LED_MODE)" for

additional information.

TABLE 3-8:

POWER AND GROUND PINS

Name

Symbol

Buffer

Type

Description

+2.5V

Analog I/O Power

Supply

VDDAH_COMMON

VDDAH_P[3:0]

VDDAH_PLL_PTP

VDDAH_SERDES

+2.5V analog I/O power supply

+1.21V Analog

Power Supply

VDDAL_COMMON

VDDAL_ADC_AB_P[3:0]

VDDAL_ADC_CD_P[3:0]

VDDAL_TXL_SERDES

VDDAL_CK125

+1.21V analog power supply

+3.3/2.5/1.8V

Variable I/O

Power Supply

Input

VDDIO

VDDIO_1

+3.3/2.5/1.8V variable I/O digital power supply input

+1.21V Digital

Core Power

Supply Input

VDDCORE

+1.21V digital core power supply input

TABLE 3-7:

CONFIGURATION STRAP INPUT PINS (CONTINUED)

Name

Symbol

Buffer

Type

Description

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