Specifications

Physical Layer Simplified Specification Version 4.10

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The Minimum user area size of SDXC Card is 67,108,864 sectors (32GB).

The Minimum value of C_SIZE for SDXC in CSD Version 2.0 is 00FFFFh (65535).

• ERASE_BLK_EN

This field is fixed to 1, which means the host can erase one or multiple units of 512 bytes.

• SECTOR_SIZE

This field is fixed to 7Fh, which indicates 64 KBytes. This value is not related to erase operation. SDHC

and SDXC Cards indicate memory boundary by AU size and this field should not be used.

• WP_GRP_SIZE

This field is fixed to 00h. SDHC and SDXC Cards do not support write protected groups.

• WP_GRP_ENABLE

This field is fixed to 0. SDHC and SDXC Cards do not support write protected groups.

• R2W_FACTOR

This field is fixed to 2h, which indicates 4 multiples. Write timeout can be calculated by multiplying the

read access time and R2W_FACTOR. Refer to Section 4.6.2 about write time.

• WRITE_BL_LEN

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

• WRITE_BL_PARTIAL

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

allowed.

• FILE_FORMAT_GRP

This field is set to 0. Host should not use this field.

• COPY

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

• PERM_WRITE_PROTECT

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

• TMP_WRITE_PROTECT

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

• FILE_FORMAT

This field is set to 0. Host should not use this field.

• CRC

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