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 AssociationByteBit7 6 5 4 3 2 1 00123NACK=0Header(NP=1, Packet Type = RES)CMD_ECHO_BACK(PLEN=11b, IOADR=X)45678910111213141516171819[31] [30][31] [30][31] [30][31] [30][Payload: DWORD from IOADR X][Payload: DWORD from IOADR +1][Payload: DWORD from IOADR X+2][Payload: DWORD from IOADR X+3]Header Argument Payload[0][0][0][0]Figure 6-12 : Transmission Order of Payload in RES (NACK = 0, PLEN = 11b)DID field in Header of RES is set to the same value as SID field in Header of the correspondingcommand. TID field in Header is set to the same value as TID field in Header of the correspondingcommand.In the case of application specific protocol (NP = 0), the definition of payload field existence may bedifferent from the case of native protocol (NP = 1). Refer to Section 7.2.1.3 for details of RES format forSD application.52
UHS-II Simplified Addendum Version 1.01©Copyright 2010-2013 SD Card Association6.2.2.6 RES (NACK = 1)Figure 6-13 illustrates RES (NACK = 1) structure.BitByte01237 6 5 4 3 2 1 0NACK=1Header(NP=1, Packet Type = RES)ECODERsvdRsvdHeaderArgumentFigure 6-13 : RES (NACK = 1) Format NACK (Negative Acknowledgement): Indicator whether the corresponding CMD is accepted ornot. NACK = 1 means the corresponding CMD is rejected. In the case of NACK = 1 (CMD is rejected), the requested operation is not in execution(an error has occurred in the corresponding CMD). ECODE[2:0] (Error Code): Error code to represent error descriptions (refer to Table 6-4). Rsvd (Reserved): Reserved bits. Initiator shall set them to '0', and receiver shall ignore them.Table 6-4 shows the error descriptions represented by ECODE. If CMD includes multiple errors, RESwith NACK = 1 is generated with the error whose ECODE value is the smallest. For example, whensome command is issued at improper state with illegal argument (e.g. illegal address), the ECODE of itsRES with NACK = 1 is COND_ERR.ECODEDescriptionValueName001b COND_ERR Command is issued in any improper statesdefined in all layers in this specification.010b ARG_ERR At least one of parameters in any of Argumentfield, Extended Argument field, or Payload field isimproper in the CMD.011b GEN_ERR Other errors not belonging to the errors above.others Reserved ReservedTable 6-4 : Error Categories and Descriptions6.2.2.7 DATAFigure 6-14 illustrates a basic DATA structure.53
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SD Specifications Part 1 UHS-II Simplified Addendum - SD Association

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