sd卡时序

Reset clk cs (CMD) IN (DATA) OUT 74+ clocks 8 8 x 4 (64 clocks) 8 8x (multiple) 8 8 40h 95h 01h 8 = Number of clocks 8 = Number of “dummy” clocks 8 x = Multiples of 8 clocks 8 x 4 = Fixed Multiple of 8 clocks 8x = Multiples of 8 “dummy” clocks 01h = Value of Hexidecimal Data Init (CMD 1) clk cs (CMD) IN (DATA) OUT 8 8 x 4 (64 clocks) 8x (multiple) 88 8 41h FFh (CRC) 00h (CRC) CID Read clk cs (CMD) IN (DATA) OUT 8 8 x 4 (64 clocks) 8x 88 4Ah FFh(CRC) 00h 8 FEh (Start Byte) CRC (2 Bytes) Don’t Care CID Data 8 8x (multiple) 8 x 16 (64 clocks) 8 8 (CMD0) NCR (CMD1) NCR (CMD10) NCR CSD Read clk cs (CMD) IN (DATA) OUT 8 x 4 (64 clocks) 8 49h FFh(CRC) 00h FEh (Start Byte) CRC (2 Bytes) Don’t Care CSD Data 8x (multiple) 8 x 16 (64 clocks)8x 88 8x2 (16 clocks)88 Read clk cs (CMD) IN 8 (CRC) FEh (Start Byte) CRC (2 Bytes) Don’t Care 8x4 (64 clocks) 888 8 x (mul t ip le) Read Data 512 Bytes * 51h FFh (DATA) OUT Write clk cs (CMD) IN 8 (CRC) FEh(Start Byte) CRC (2 Bytes) Don’t Care 8x4 (64 clocks) 8888 8 x (mul t ip le) Write Data 512 Bytes 58h FFh 00h 8 x (mul t ip le)512 + 2 xxx0 0101 b Busy (DATA) OUT (CMD9) NCR NCR 00h NAC 8 x (mul t ip le) 8 * # Bytes set by CMD16 (Default 512) 8 x (mul t ip le) NCR NWR 8 8 8 = Number of clocks 8 = Number of “dummy” clocks 8 x = Multiples of 8 clocks 8 x 4 = Fixed Multiple of 8 clocks 8x = Multiples of 8 “dummy” clocks 01h = Value of Hexidecimal Data Set Block Length clk cs (CMD) IN 8 x 4 (64 clocks) 8 x (mul t ip le) 888 50h FFh Block Length 4 Bytes 00h (DATA) OUT 8 8 = Number of clocks 8 = Number of “dummy” clocks 8 x = Multiples of 8 clocks 8 x 4 = Fixed Multiple of 8 clocks 8x = Multiples of 8 “dummy” clocks 01h = Value of Hexidecimal Data