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

UHS-II Simplified Addendum Version 1.01©Copyright 2010-2013 SD Card Association In the case of NACK = 0 (CMD is accepted), the requested operation is in execution orwaiting for execution. In the case of NACK = 1 (CMD is rejected), the requested operation is not in execution(an error has occurred in the corresponding CMD). Refer to Section 6.2.2.6 for details of RES with NACK = 1. CMD_ECHO_BACK[14:0] (Command Echo Back): Copied field of CMD Argument. The same values in Argument field are copied from the corresponding CMD (echo back).Specifically, [6:0] in the second byte, and [7:0] in the third byte of CMD packet are copiedto the same location of RES packet. Payload: Read data for control read transaction. The length of payload field is assigned in PLEN of the corresponding read CCMD. In the case that PLEN of the CCMD is set to "00b" (payload length is 0 byte), Payloadfield does not exist. In the case that write CCMD is issued, Payload field in RES does not exist. In the case that DCMD is issued (data transaction), Payload field in RES does not exist. The Payload field is divided into a unit of DWORD (4byte data), and the transmissionorder within a DWORD is big endian. Refer to Figure 6-11 and Figure 6-12 for details ofthe transmission order of Payload. In these figures, bracketed numbers denote the bitorder within a DWORD.ByteBit7 6 5 4 3 2 1 00123NACK=0Header(NP=1, Packet Type = RES)CMD_ECHO_BACK(PLEN=01b, IOADR=X)4567[31] [30][Payload: DWORD from IOADR X][0]Header Argument PayloadFigure 6-11 : Transmission Order of Payload in RES (NACK = 0, PLEN = 01b)51