User's Manual

2GB 150x Secure Digital Card

Transcend Information Inc.

[14] 1 Copy flag COPY 0 b Not copied

[13] 1 Permanent write protection PERM_WRITE_PROTECT 0 b Not protected

[12] 1 Temporary write protection TMP_WRITE_PROTECT 0 b Not protected

[11:10] 2 File format FILE_FORMAT 00 b HD like FAT

[9:8] 2 ECC code ECC 00 b None

[7:1] 7 CRC CRC --- ---

[0] 1

Not used always ｀1

--- 1 b ---

(*1) Support command class 0,2,4,5,6,7,8. Include : Basic, Block read/write, Erase, Write protection, application

command, and Lock card. Not support 1,3. Include : Stream read/write.

(*2)~(*4) This field is not a constant value. The value will be changed by different flash memory.

6. Extended CSD Register (EXT_CSD)

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

The most significant 320 bytes are the Properties segment, which defines the card capabilities and cannot be

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

working in. These modes can be changed by the host by means of the SWITCH command.

7. SD card Configuration Register (SCR)

The CSD register is another configuration register in SD card. SCR provides on SD card s special features that were

configured into the given card. The size of SCR is 64 bit.

For SD card only. SCR is a read only register.