The SD 2.0 interface figure shows the SD1 (2.0) boot mode interface from a single SD flash device and expects the PMC_MIO Bank1 to be at 3.3V.
The PMC_MIO Bank 1 voltage is used by all 26 MIO included in that bank. If the PMC_MIO Bank1 is shared by other peripherals that require 1.8V or 2.5V to be used, an external voltage level translator is required to interface to the SD card in SD1(2.0) boot mode.
Figure 1. SD 2.0 InterfaceThe SD1_DETECT, SD1_WP, and SD1_BUSPWR are optional interface signals not required for primary boot.