LAN8808D datasheet(23/80 Pages) MICROCHIP

23 / 80 page

LAN8808D

DS00005833C-page 23

3.3.2

PHY ADDRESS (PHYAD[4:0])

The PHYAD[4:0] configuration straps set the base value of the PHY’s management address. The addresses of each of

the 4 PHYs are the base value, as defined by PHYAD[4:0], plus offsets of 0, 1, 2 and 3.

3.3.3

LED MODE SELECT (LED_MODE)

The LED_MODE configuration strap selects between Individual-LED (pulled-up) or Tri-color-LED (pulled-down)

modes. 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

LED operation is described in Section 5.17, "LEDs".

3.3.4

LED POLARITY (PORT[3:0]_LED[2:1]_POL)

The PORT[3:0]_LED[2:1]_POL configuration straps set the default polarity of the LED pins. When a LED pin is used as

a function mode strap (for example a PHY address bit), the default LED pin polarity is automatically selected based on

the inverse of the strap value. A LED, via a resistor, is then used as a pull-up or pull-down. This is shown in Figure 3-2.

LED operation is described in Section 5.17, "LEDs".

01111 RESERVED

11110 RESERVED

FIGURE 3-2:

STRAP ON LED WITH POLARITY

TABLE 3-9:

DEVICE MODE SELECTIONS (CONTINUED)

Legend:

1000FD = 1000BASE-T Full Duplex

100FD = 100BASE-TX Full Duplex

100HD = 100BASE-TX Half Duplex

10FD = 10BASE-T Full Duplex

10HD = 10BASE-T Half Duplex

“X” means “is advertised by auto-negotiation” (for example 10BT FD and 10BT HD are both available auto-negotiation

results when MODE_SEL = 10000).

Functional Strap = 0

LED Output = Active High (LEDPOL Strap = 1)

VDDIO

Functional Strap = 1

LED Output = Active Low (LEDPOL Strap = 0)

LED/Strap Pin

Supplemental

resistor to

ensure a valid

low level

during strap

load

220



220



10 k



10 k



Supplemental

resistor to

ensure a valid

high level

during strap

load

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