SanDisk SD Card

Revision 2.2Chapter 5 – SPI ProtocolSD Card Product ManualHost Command to Card Response—Card is BusyCSH L L L*******************LL L L H H H LL L L L L H HN CSN ECN DSN ECData InX H H HH 6 byte cmd H H H H H H H H H H HH H X X X H HHH H H X XData OutZ Z H H HN CRH ******** H H H H Card resp. Busy L Z Z Z BusyH H H H ZCard Response to Host CommandCSL L L L L*******************LL H H H HData InH H H HHH****************H H H H 6-byte commandHHH X X X XData OutH H H HHN CR1 or 2 byte resp. H H H H********************* H HH H Z Z Z5.23.3 Data ReadThe following timing diagram describes all single block read operations with the exceptionof SEND_CSD command.Single Block Read TimingCSH L L L***************************************L L L H H H HN CSN ECData InX H H HHRead Command H H H H H***********************HHH X X X XData OutZ Z H H HH********HN CRH H HN ACCard resp. H H H H Data Block H HH H Z Z ZThe following figure describes a Stop Transmission operation in case Multiple Block Readoccurs.Multiple Block Read TimingCSL L L L*******************Data InN CSX H H H Hstop tran cmd H H H H H ***************Data OutN CRdata transfer to host H Hcard response HReading the CSD RegisterThe following timing diagram describes the SEND_CSD command bus transaction. Thetimeout values for the response and the data block are N CR (because the N AC is stillunknown).Reading the CSD RegisterCSH L L L*******************LLL H H H HData InN CSN ECX H H H H read command H H H H H*********************H H H X X X XN CXData OutZ Z H HHN CRH ********** H H H H card response H H H H data blk H HH H Z Z Z© 2004 SanDisk Corporation 5-18 12/08/04