Specifications

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Physical Layer Simplified Specification Version 4.10

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• TAAC

This field is fixed to 0Eh, which indicates 1 ms. The host should not use TAAC, NSAC, and

R2W_FACTOR to calculate timeout and should uses fixed timeout values for read and write operations

(See 4.6.2).

• NSAC

This field is fixed to 00h. NSAC should not be used to calculate time-out values.

• TRAN_SPEED

TRAN_SPEED is variable depends on bus speed mode of SD Interface. Definition of this field is same

as in CSD Version1.0 in case of Default and High Speed mode. This field shall be set to 0Bh

(100Mbit/sec) in both SDR50 and DDR50 mode, and shall be set to 2Bh (200Mbit/sec) in SDR104 mode.

When CMD0 is received, this field is reset to 32h.

UHS-II mode is not related to this field.

• CCC

Definition of this field is same as in CSD Version1.0.

• READ_BL_LEN

This field is fixed to 9h, which indicates READ_BL_LEN=512 Byte.

• READ_BL_PARTIAL

This field is fixed to 0, which indicates partial block read is inhibited and only unit of block access is

allowed.

• WRITE_BLK_MISALIGN

This field is fixed to 0, which indicates that write access crossing physical block boundaries is always

disabled in SDHC and SDXC Cards.

• READ_BLK_MISALIGN

This field is fixed to 0, which indicates that read access crossing physical block boundaries is always

disabled in SDHC and SDXC Cards.

• DSR_IMP

Definition of this field is same as in CSD Version1.0.

• C_SIZE

This field is expanded to 22 bits and can indicate up to 2 TBytes (It is the same as the maximum

memory space specified by a 32-bit block address.)

This parameter is used to calculate the user data area capacity in the SD memory card (not include the

protected area). The user data area capacity is calculated from C_SIZE as follows:

memory capacity = (C_SIZE+1) * 512KByte

The Minimum user area size of SDHC Card is 4,211,712 sectors (2GB + 8.5MB).

The Minimum value of C_SIZE for SDHC in CSD Version 2.0 is 001010h (4112).

The maximum user area size of SDHC Card is (32GB - 80MB)

The maximum value of C_SIZE for SDHC in CSD Version 2.0 is 00FF5Fh (65375).