All straps are only two level straps in DP83825. DP83825 contains internal pull down resistors on the strap pins. The EVM takes advantage of this feature and has only pull up resistors on the board. When DP83825 strap pins are using internal pull down the corresponding pin is strapped to ‘0’ and when the strap pin has an external pull up resistor connected, the corresponding pin is strapped to ‘1’. Resistors R43, R45, R48, R50, needs to be installed to be used as pull up strap connectors (can be found on the back side of the board). When any strap pin needs to be strapped to ‘0’ on the EVM, disconnect the corresponding resistor. When a strap pin needs to be strapped to ‘1’, populate the corresponding resistor.

The LED_0 pin also has a strap. Because LED pins have automatic polarity, separate LEDs are used on the EVM depending on LED_0 pin being strapped high or low. In position 1-2 LED_0 is pulled low (0) and in position 2-3 LED_0 is pulled high (1).

Figure 3-1 LED_0 Strap