Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 4/01/2024
Public
Document Table of Contents

5.4.6.5. Resets

The SD/eMMC controller has a single reset signal, driven by the reset manager. The reset signal is active low, asynchronously asserted, and synchronously de-asserted, relative to l4_mp_clk.

The reset manager automatically asserts the reset signal on POR, cold, and warm resets. The software then takes the controller out of reset by clearing the reset manager per0modrst.sdmmc bit.

The reset signal can also be asserted by the HPS software setting the reset manager per0modrst.sdmmc bit. Enough time must pass before clearing the per0modrst.sdmmc bit to allow the state machine to perform the reset.