Strap configurations can be verified with the strap tool referred in Section 2.1.

Strap configurations are sampled at power up or hardware reset, through either the RESET pin or bit 15 of register 0x001F.

Ensure that no other component on the line need to affect the DC bias set by this network. A pullup resistor and a pulldown resistor of suggested values should be used to set the voltage ratio of the bootstrap pin input and the supply to select one of the possible modes.

However, in some cases, other devices on the board (for example, the MAC) will pull or drive these pins unexpectedly. The strap values can be read from registers 0x467 (SOR1) and 0x468 (SOR2), these registers are extended registers and can only be accessed using Extended Register Access.

It is recommended to use following resistors for strapping. If the register value does not match the intended strapping configuration, measurements can be made during power up and after power up when the RESET_N signal is asserted.

Figure 2-5 Bootstrap Circuits