SD Specifications Part 1 UHS-II Simplified Addendum - SD Association

GO_DORMANT_STATEUHS-II Simplified Addendum Version 1.01©Copyright 2010-2013 SD Card AssociationProcess nameOutline of processPower OnFULL_RESETHost can provide RCLK withdifferent frequency from that beforeissuing GO_DORMANT_STATE.PHY Initialization• PLL Activation• Establishing synchronizationPHY Initialization• PLL Activation• Establishing synchronizationWakeup StateDevice InitializationConfig StateThese processes aremandatory after power cycleor FULL_RESET."Selected Transmission SpeedRange" shall be set to 01b inthis process.• Starting Device wakeupEnumeration• Device ID assignmentConfiguration• Reading and Setting forCFG_REGDevice Initialization andEnumeration may be skippedwhen recovering fromDormant state. In addition,Configuration is also skippedbecause "Config Completion"is equal to 1."Config Completion" is set to 1Active StateFigure 6-16 : An Example of UHS-II Initialization Flow (in Case of Using Higher Speed Range)Host shall set "Selected Transmission Speed Range" in CFG_REG to the desire range (01b, in thiscase) at the Configuration process. After setting "Config Completion" to 1, Host issuesGO_DORMANT_STATE in order to enable "Selected Transmission Speed Range". Afterwards, itprovides RCLK to do PHY Initialization again. Note that frequency of RCLK may be changed duringDormant state only. At the end of PHY Initialization, DLSM transits to Active State where higher speedrange is available because "Config Completion" has been already set to 1.6.2.4 Transition to Dormant State6.2.4.1 GeneralWhen Device receives GO_DORMANT_STATE CCMD, it makes its DLSM transit to Dormant state forinterface power saving. During Dormant state, state machines defined in Chapter 6 get back to theinitial state. On the other hand, all registers defined in Chapter 6 are kept and some Settings Registersin CFG_REG are reflected by transiting to Dormant state (refer to Section 6.2.9.2).56