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MICROSDHC Datasheet(PDF) 16 Page - Transcend Information. Inc.

Part No. MICROSDHC
Description  High Capacity microSD Card
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Maker  TRANSCEND [Transcend Information. Inc.]
Homepage  http://www.transcendusa.com
Logo TRANSCEND - Transcend Information. Inc.

MICROSDHC Datasheet(HTML) 16 Page - Transcend Information. Inc.

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High Capacity microSD Card
Transcend Information Inc.
16
Note that for current SD Memory Cards that field must be always 0_0110_010b (032h) which is equal to 25MHz - the
mandatory maximum operating frequency of SD Memory Card.
In High-Speed mode, that field must be always 0_1011_010b (05Ah) which is equal to 50MHz. And when the timing
mode returns to the default by CMD6 or CMD0 command, its value will be 032h.
CCC
The SD Memory Card command set is divided into subsets (command classes). The card command class register CCC
defines which command classes are supported by this card. A value of ‘1’ in a CCC bit means that the corresponding
command class is supported.
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 write access crossing physical block boundaries is always disabled in High
apacity SD Memory Card.
C
READ_BLK_MISALIGN
This field is fixed to 0, which indicates read a
disabled in High Capacity SD Memory Card.
ccess crossing physical block boundaries is always
DSR_IMP
Defines if the configurable driver stage is integrated on the card. If set, a driver stage register (DSR)must be
implemented also.


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