Datasheet

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Ver 1.1
4~16G High Capacity microSD Card
Transcend Information Inc.
18
4. RCA Register
The writable 16-bit relative card address register carries the card address that is published by the card during the card
identification. This address is used for the addressed host-card communication after the card identification procedure.
The default value of the RCA register is 0x0000. The value0x0000 is reserved to set all cards into the Stand-by State
with CMD7.
5. DSR Register (Optional)
It can be optionally used to improve the bus performance for extended operating conditions (depending on parameters
like bus length, transfer rate or number of cards). The CSD register carries the information about the DSR register usage.
The default value of the DSR register is 0x404.
6. SCR Register
In addition to the CSD register there is another configuration register that named - SD CARD Configuration Register
(SCR). SCR provides information on SD Memory Card's special features that
were configured into the given card. The
size of SCR register is 64 bit. This register shall be set in
the factory by the SD Memory Card manufacturer.
The following table describes the SCR register content.
Description Field Width Cell
Type
SCR
Slice
SCR Structure SCR_STRUCTURE 4 R [63:60]
SD Memory Card - Spec. Version SD_SPEC 4 R [59:56]
data_status_after erases DATA_STAT_AFTER_ERASE 1 R [55:55]
CPRM Security Support SD_SECURITY 3 R [54:52]
DAT Bus widths supported SD_BUS_WIDTHS 4 R [51:48]
Spec. Version 3.00 or higher SD_SPEC3 1 R [47]
Extended Security Support EX_ SECURITY 4 R [46:43]
Reserved 9 R [42:34]
Command Support bits CMD_SUPPORT 14 R [33:32]
reserved for manufacturer usage - 32 R [31:0]