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

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UHS-II Simplified Addendum Version 1.01©Copyright 2010-2013 SD Card AssociationIf Host intends to use UHS-II interface, it supplies VDD2, RCLK and VDD1 after power up, and setsSTB.L on D0.Tx. Device connects termination resistors of RCLK Lanes after power up. Device startsPHY Initialization when receiving STB.L and responds STB.L if it succeeds.The method for Host to distinguish whether Device fails to start PHY initialization is through detectingtimeout from Host's setting STB.L on D0.Tx to receiving it on D1.Rx, which can be estimated fromTeidl_stb and UHS-II bus topology.If Host detects timeout, Host sets RCLK Lane to DIF-Z to stop supplying RCLK, and then Host suppliesSDCLK and issues CMD8 and ACMD41 for Legacy SD protocol to initialize SD interface. Then, Hostproceeds card identification and the card status transits to "data transfer mode" in Legacy SD (same asdata transfer mode defined in SD Specifications Part 1 Physical Layer Simplified Specification Version4.10) as a result. When Legacy SD interface is selected, UHS-II interface that is activated by power upis disabled before ACMD41 is completed. Moreover, termination resistors of RCLK Lanes in Device aredisconnected when disabling UHS-II interface. As the sequence to "data transfer mode" in Legacy SD inFigure 7-11 is simplified, refer to SD Specifications Part 1 Physical Layer Simplified SpecificationVersion 4.10 for detailed specifications of Legacy SD initialization. Note that if CMD0 is issued inLegacy SD card state transits to 'idle'. (Note that it is impossible to execute (UHS-II) PHY Initialization.)On the other hand, if Device succeeds PHY Initialization, UHS-II interface is available and then, DeviceInitialization, Enumeration and Configuration take place in this order. If Host detects "Application Type"is "SD memory" or "SDIO" during Configuration, it can issue the encapsulated SD CMD. Host shallexecute card identification described in Section 7.2.4.1 by encapsulated SD CMDs in case of detecting"SD memory". If encapsulated CMD0 is issued, card state transits to 'idle' in SD-TRAN. On the otherhand, if FULL_RESET CCMD is issued, Device waits STB.L for PHY Initialization.If Host intends to use only Legacy SD interface or detects that Legacy SD Card is inserted, it is allowedto supply only VDD1 and SDCLK, and issue CMD8 in order to accelerate initialization of Legacy SDinterface. Note that once UHS-II I/F is disabled, Host requires power cycle to enable UHS-II again.Refer to Section 3.10.4 in SD Specification Part 1 Version 4.00 for more details about VDD2 supply.Note that Device's power consumption during Device Initialization is not regulated by Power Limitspecified by CMD6, but parameters specified by DEVICE_INIT CCMD.7.2.3.3 Interface Selection after FULL_RESET or GO_DORMANT_STATEFigure 7-12 shows a concept diagram of initialization flow after executing FULL_RESET orGO_DORMANT_STATE CCMD.84
UHS-II Simplified Addendum Version 1.01©Copyright 2010-2013 SD Card AssociationHost executes Power CycleSome of theseoperations may beskipped.From Dormant StateHost supplies VDD2, RCLK (and VDD1),and sets STB.L on D0.TxNoHost detects STB.Lon D1.Rx?YesPHY Initialization• PLL Activation• Establishing synchronizationDevice InitializationEnumerationConfigurationFULL_RESETUHS-II InitializationFrom "SD-TRANdata transfer mode"UHS-II I/F is selectedUHS-IISDI/FI/FSELBECard ControllerGO_DORMANT_STATEInitialization for SD-TRAN"SD-TRAN card identification mode"CMD0(SD-TRAN)CMD8ACMD41CMD2CMD3"SD-TRAN data transfer mode"Figure 7-12 : Initialization Flow after FULL_RESET or GO_DORMANT_STATEHost shall not select Legacy SD interface after issuing these CMDs. Then if Host detects that Devicefails to start PHY Initialization, Host requires power cycle to recover this illegal situation.Setting of Power Limit specified by CMD6 is kept after recovering from Dormant State. After exitingDormant State and until going into Active state, power consumption of Device is up to 0.72W. Setting ofPower Limit which has been specified by CMD6 is effective in Active state again.Active statePower Limitsetting by CMD6GO_DORMANT_STATEPHYInitialization(Configuration)Power Limitset by CMD60.72WPower Limitset by CMD6Figure 7-13 : Power Consumption after Exiting from Dormant State7.2.4 Transaction Control and Management State MachineFrom this section, an "encapsulated CMD" is described as just a "CMD" for simplicity (e.g."encapsulated CMD0" is described as "CMD0"). In this section, state diagrams in card identificationmode and data transfer mode for SD-TRAN are shown. They are based on those in Legacy SD, butsome differences exist as described below.7.2.4.1 Card Identification ModeFigure 7-14 shows a state diagram for card identification mode on SD-TRAN.85
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SD Specifications Part 1 UHS-II Simplified Addendum - SD Association

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