Register Name

Bits

Bit Width Description

typ. Value

WRITE_BLK_MISALIGN

78

1

Write block misalignment

0x0

READ_BLK_MISALIGN

77

1

Read block misalignment

0x0

DSR_IMP

76

1

DSR implemented

0x0

—

75:74

2

Reserved

-

C_SIZE

73:62

12

Device size

0xFFF

VDD_R_CURR_MIN

61:59

3

Max read current @VDD min

0x7

VDD_R_CURR_MAX

58:56

3

Max read current @VDD max

0x7

VDD_W_CURR_MIN

55:53

3

Max write current @VDD min

0x7

VDD_W_CURR_MAX

52:50

3

Max write current @VDD max

0x7

C_SIZE_MULT

49:47

3

Device size multiplier

0x7

ERASE_GRP_SIZE

46:42

5

Erase group size

0x1F

ERASE_GRP_MULT

41:37

5

Erase group size multiplier

0x1F

WP_GRP_SIZE

36:32

5

Write protect group size

0x0F

WP_GRP_ENABLE

31

1

Write protect group enable

0x1

DEFAULT_ECC

30:29

2

Manufacturer default ECC

0x0

R2W_FACTOR

28:26

3

Write speed factor

0x2

WRITE_BL_LEN

25:22

4

Max. write data block length

0x9

WRITE_BL_PARTIAL

21

1

Partial blocks for write allowed

0x0

—

20:17

4

Reserved

-

CONTENT_PROT_APP

16

1

Content protection application

0x0

FILE_FORMAT_GRP

15

1

File format group

0x0

COPY

14

1

Copy flag (OTP)

0x1

PERM_WRITE_PROTECT

13

1

Permanent write protection

0x0

TMP_WRITE_PROTECT

12

1

Temporary write protection

0x0

FILE_FORMAT

11:10

2

File format

0x0

ECC

9:8

2

ECC code

0x0

CRC

7:1

7

Checksum of CSD contents

-

—

0

1

Always=1

0x1

9.4 Extended CSD Register

The Extended CSD register defines the Device properties and selected modes. It is 512 bytes long. The most

significant 320 bytes are the Properties segment, which defines the Device capabilities and cannot be modified

by the host. The lower 192 bytes are the Modes segment, which defines the configuration the Device is working

in. These modes can be changed by the host by means of the SWITCH command. For details, refer to section

7.4 of the JEDEC Standard JESD84-B51.

Table 37: Extended CSD Register

Register Name

Bytes

Byte

Width

Description

typ. Value

Properties Segment

–

511:506

6

Reserved

–

EXT_SECURITY_ERR

505

1

Extended Security

Commands Error

0x00

S_CMD_SET

504

1

Supported Command Sets

0x01

Confidential

-36

／42-

Rev.1.0 July 2023

32GB/64GB/128GB eMMC