> ## Documentation Index
> Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Modify SDHC card power management states
Modify SDHC power management states to optimize power management.
**SD card power management states**
| State | Description |
| ------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Runtime suspend or resume | - The SD card enters the runtime suspend state after 50 ms of inactivity.
- Resume occurs with the next SD card operation. This state is enabled by default and is not configurable.
- The eMMC transitions to the runtime suspend state after 50 milliseconds of inactivity. It resumes with the next I/O operation. This feature is always enabled and cannot be configured.
|
| System suspend or resume | - The SD card enters system suspend state with the suspend event.
- SD card system resume state occurs with the system resume event.
- This state is enabled by default and is not configurable.
- The eMMC enters system suspend mode upon receiving a suspend event and resumes operation with a system resume event. This functionality is always enabled and cannot be configured.
|