Functional Description
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The module exits the force-idle mode when the PRCM deasserts the idle request. Then the module
switches back to normal mode. The module is fully operational. Interrupt and DMA request lines are
optionally asserted one clock cycle later.
18.3.3.6 Local Power Management
Table 18-9 describes power-management features available for the MMC/SD/SDIO modules.
Table 18-9. Local Power Management Features
Feature Registers Description
Clock Auto Gating SD_SYSCONFIG AUTOIDLE bit This bit allows a local power optimization inside module, by
gating the OCP clock upon the interface activity or gating the
CLKADPI clock upon the internal activity.
Slave Idle Modes SD_SYSCONFIG SIDLEMODE bit Force-idle, No-idle, and Smart-idle modes
Clock Activity SD_SYSCONFIG CLOCKACTIVITY bit Please see Table 18-10 for configuration details.
Global Wake-Up SD_SYSCONFIG ENAWAKEUP bit This bit enables the wake-up feature at module level.
Enable
Wake-Up Sources SD_HCTL register This register holds one active high enable bit per event source
Enable able to generate wake-up signal.
Table 18-10. Clock Activity Settings
Clock State When Module is in
IDLE State
CLOCKACTIVITY Features Available when Module is in
Values OCP Clock CLKADPI IDLE State Wake-Up Events
00 OFF OFF None Card Interrupt
10 OFF ON None
01 ON OFF None
11 ON ON All
CAUTION
The PRCM module has no hardware means of reading CLOCKACTIVITY
settings. Thus, software must ensure consistent programming between the
CLOCKACTIVITY and MMC clock PRCM control bits.
3360
Multimedia Card (MMC) SPRUH73H–October 2011–Revised April 2013
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