The PHY is sent into the reset state. This can be done in two ways, via hardware where the Reset pin is held low for F duration, or via software where register 0x1F[15] = ‘1’. The point in time when either the Reset pin is released, or the write command has been delivered to the PHY is known as T₁. While these procedures do initiate a reset of the PHY, issuing the reset via pin toggling causes the PHY to sample the bootstraps while issuing a via register write does not cause resampling.