Sdio Device Connections; Unused Pins - Nvidia TEGRA DG-04927-001_V01 User Manual

Tegra 200 series

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Tegra 200 Series Developer Board User Guide

4.8.3 SDIO Device Connections

An SDIO controller is often used to interface to medium bandwidth peripherals such as a Wi-Fi controller. The connection

example in Figure 22 is from the Smartbook Development System. This shows a Wi-Fi/BT module interfacing to the Tegra 250

SDIO1, UART3 and DAP4 interfaces as well as several GPIO pins for control. Only the signals between the Tegra 250 and the

module are shown.

Figure 22. Tegra 250 SDIO WiFi Connection Example

Any unused data pins can be left unconnected. If the HSMMC or SD/SDIO interfaces will not be supported at all, then any

unused signal pin can be left unconnected or configured for another function or GPIO. If none of the signals are used on one of

the digital power domains (except VDDIO_DDR and VDDIO_SYS which must be powered for normal operation), then the

associated power rail can be left unconnected or tied to GND.

Advance Information – Subject to Change

DG-04927-001_v01

NVIDIA CONFIDENTIAL

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Tegra 250