SD_PARSED_REGISTER_CSD
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8/28/2008
This structure contains all the information obtained by parsing the CSD register of an SD Memory card.
Syntax
typedef struct _SD_PARSED_REGISTER_CSD {
UCHAR CSDVersion;
struct {
DOUBLE TAAC;
USHORT NSAC;
}DataAccessTime;
ULONG MaxDataTransferRate;
USHORT CardCommandClasses;
USHORT MaxReadBlockLength;
BOOLEAN ReadBlockPartial;
BOOLEAN WriteBlockMisalign;
BOOLEAN ReadBlockMisalign;
BOOLEAN DSRImplemented;
ULONG DeviceSize;
USHORT VDDReadCurrentMin;
USHORT VDDReadCurrentMax;
USHORT VDDWriteCurrentMin;
USHORT VDDWriteCurrentMax;
BOOLEAN EraseBlockEnable;
UCHAR EraseSectorSize;
UCHAR WPGroupSize;
UCHAR WPGroupEnable;
UCHAR WriteSpeedFactor;
USHORT MaxWriteBlockLength;
BOOLEAN CopyFlag;
BOOLEAN PermanentWP;
BOOLEAN TemporaryWP;
SD_FS_TYPE FileSystem;
UCHAR RawCSDRegister[16];
} SD_PARSED_REGISTER_CSD, *PSD_PARSED_REGISTER_CSD;
Members
- CSDVersion
4-bit CSD structure version.
- DataAccessTime.TAAC
TAAC field of the card specific data (CSD), in nanoseconds.
- DataAccessTime.NSAC
NASC field of the CSD, in units of clock-cycles.
- MaxDataTransferRate
Maximum data transfer rate, in kilobits per second.
- CardCommandClasses
12-bit command class support indicators.
- MaxReadBlockLength
Maximum read block length, in bytes. This value can be 512, 1024, and 2048.
- ReadBlockPartial
Partial block reads are allowed.
- WriteBlockMisalign
Misaligned block reads are allowed.
- DSRImplemented
Driver stage register (DSR) is implemented.
- DeviceSize
Calculated device memory size, in bytes.
Windows Embedded CE 6.0 R2 and later** **
For SD high capacity cards the device memory size is calculated in blocks, not bytes.
- VDDReadCurrentMin
VDD_R_CURR_MIN field of the CSD, in milliamps.
- VDDReadCurrentMax
VDD_R_CURR_MAX field of the CSD, in milliamps.
- VDDWriteCurrentMin
VDD_W_CURR_MIN field of the CSD, in milliamps.
- VDDWriteCurrentMax
VDD_W_CURR_MAX field of the CSD, in milliamps.
- EraseSectorSize
Number of write blocks that form an erasable sector. This value is equal to the SECTOR_SIZE field of the CSD plus one.
- WPGroupSize
Number of erase sectors that form a write-protect group. This value is equal to the WP_GRP_SIZE field of the CSD plus one.
- WPGroupEnable
Group write protection is enabled.
- WriteSpeedFactor
Block write time as a multiple of the read access time.
- MaxWriteBlockLength
Maximum write block length, in bytes.
- WriteBlockPartial
Partial block writes are allowed.
- CopyFlag
Copy control flag.
- PermanentWP
Permanent write-protect flag.
- TemporaryWP
Temporary write-protect flag.
- FileSystem
File system type.
- RawCSDRegister
16 bytes containing the raw CSD register data. Bit zero of the CSD data is the least significant bit of array element zero.
Requirements
| Header | sdcardddk.h |
| Windows Embedded CE | Windows CE 5.0 and later |