SanDisk SD Card

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Revision 2.2Chapter 4 – SD Card Protocol DescriptionSanDisk SD Card Product Manual4.4.10 Relationship between CMD6 Data and Other CommandsThe card may accept the commands using only CMD line (CMD12, CMD13, etc.) duringthe CMD6 transaction but its response and result is undefined.Note: The host is advised not to issue any command during CMD6 transaction. If the hostcannot get valid data of CMD6, it advised to issue CMD0 and try re-initialization.Table 4-11Relationship between CMD6 & CMD12Case Reference Description Notes1(Not complete,card does notoutput all dataFigure 4-9In case that the host sends the end bit ofCMD12 before CRC bit 15, CMD6 is stoppedby CMD12, card shall terminate data transferof CMD6. The card behavior is notguaranteed and re-initialization from CMD0 isthe only way to recover from undefined sate.The end bit of the host command is followed,on the data line, with one more data bit andone end bit.2(Complete, cardoutputs all data)Figure 4-10The card shall complete CMD6 execution andits behavior is guaranteed. Complete caseincludes the later timing of CMD12. The endbit of the host command is followed, on thedata line, with one more data bit and one endbit.The host isadvised not toissue CMD12during CMD6transaction.Figure 4-10 CMD12 during CMD6: Case 1CMDSTContentECMD12DATdata0data510data511CRCBit 0CRCBit 13CRCBit 14CRCBit 15E Z Z .....Data packetRead data for CMD6Figure 4-11 CMD12 during CMD6: Case 2CMDSTContentECMD12DATdata0data510data511CRCBit 0CRCBit 13CRCBit 14CRCBit 15EE Z Z .....Data packetRead data for CMD6© 2004 SanDisk Corporation 4-24 12/08/04
Revision 2.2Chapter 4 – SD Card Protocol DescriptionSanDisk SD Card Product ManualSwitch Function Flow ExampleThe host is recommended to take the following flow for switching the function.Figure 4-12Switch Function FlowStartSpec 1.0-1.10NCard version no.?func
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Host Design Considerations:Applicat
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