SD Specifications Part 1 UHS-II Simplified Addendum - SD Association
SD Specifications Part 1 UHS-II Simplified Addendum - SD Association
SD Specifications Part 1 UHS-II Simplified Addendum - SD Association
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<strong>UHS</strong>-<strong>II</strong> <strong>Simplified</strong> <strong>Addendum</strong> Version 1.01©Copyright 2010-2013 <strong>SD</strong> Card <strong>Association</strong>7.2.1.4 RES (NACK = 1)Unlike the Legacy <strong>SD</strong> protocol, Device shall respond RES with NACK = 1 if it receives illegal CMD.Figure 7-9 illustrates the RES with NACK = 1 on <strong>SD</strong>-TRAN.BitByte01237 6 5 4 3 2 1 0NACK=1Header(NP=0, Packet Type = RES)ECODE = 001bRsvdRsvdHeaderArgumentFigure 7-9 : RES (NACK = 1) Format on <strong>SD</strong>-TRAN 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), Device shall not execute the requestedoperation (an error has occurred in the corresponding CMD). ECODE[2:0] (Error Code): Error code to represent error descriptions. It shall be set to 001b in<strong>SD</strong>-TRAN. Rsvd (Reserved): Reserved bits. Initiator shall set them to '0', and receiver shall ignore them.7.2.1.5 DATAFigure 7-10 illustrates DATA on <strong>SD</strong>-TRAN.BitByte012:::7 6 5 4 3 2 1 0Header(NP=0, Packet Type = DATA)<strong>SD</strong>_DATAHeaderPayloadEncapsulated data payload on <strong>SD</strong> /wo CRC16Figure 7-10 : DATA Format on <strong>SD</strong>-TRAN82
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