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 Association6.2.6 Device Initialization Mechanism6.2.6.1 GeneralDevice initialization mechanism enables Host system to optimize initialization time considering powerconsumption. Under Multi-device connection Host may perform initializations for multiple Devices at thesame time with in a range of a Host's power supply capability. Device Initialization takes place byissuing the broadcast CCMD called DEVICE_INIT iteratively, and the Host's power supply capability isprovided by the argument of DEVICE_INIT to each Device.Figure 6-21 illustrates a format of DEVICE_INIT CCMD.BitByte456701237 6 5 4 3 2 1 0R/W=1 RsvdHeader(NP=1, DID = SID = 0, Packet Type = CCMD)GDDAPPLEN = 01bIOADR(msb)CFReservedIOADRGAP(lsb)Figure 6-21 : DEVICE_INIT CCMD Format GD[3:0] (Group Descriptor): This value indicates the group number to be initialized. The startvalue is 0 and incremented when all Devices in the group are initialized. GAP[3:0] (Group Allocated Power): This value indicates the maximum Host's power supplycapability that is allowed to certain group. A Device which starts initialization updates this value bysubtracting own power consumption from this value. In such a way this field represents thecurrently remained power resource for a given group. 0: Reserved 1: 360 [mW] (3.6Vx100mA)2: 720 [mW]3: 1080 [mW]:Header Argument Payload n: 360n [mW] (n ≤ 15) DAP[3:0] (Device Allocated Power): This value is the maximum Host's power supply capabilitythat is allowed to a certain Device. 0: 360 [mW] Default (Host does not know own power capability) 1: 360 [mW] (3.6Vx100mA) 2: 720 [mW] 3: 1080 [mW]: n: 360n [mW] (n ≤ 15)58
UHS-II Simplified Addendum Version 1.01©Copyright 2010-2013 SD Card Association CF (Completion Flag): Device shall clear this bit to "0" if it is not initialized yet. Host uses thisvalue to check whether all Devices are initialized in the system. If Host detects CF = 0 (not allDevices are initialized) from the received DEVICE_INIT, Host continues to issue DEVICE_INITCCMD. 0: Not all Devices complete initialization. 1: All Devices complete initialization.Device can accept DEVICE_INIT CCMD only in Config state. So Device shall regard it as an illegalCMD and shall not transmit it to the next Node in case of other than Config state.Application Note:Host should estimate at least 0.72W power supply capability for a UHS-II SD memory card untilPower Limit is set, including settings of DAP and GAP.When DAP or GAP is set to 0.36W, whether device can be initialized or not is dependent onimplementation.PHYInitializationDeviceInitializationEnumerationConfigurationSD TranInitializationPower Limitsetting by CMD6DAP=0.72W (1)0.054W 0.72W (Throughout Initialization Period)Power Limitset by CMD6Note (1) : Host should set DAP to 0.72W (=
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SD Specifications Part 1 UHS-II Simplified Addendum - SD Association

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