Specifications

©Copyright 2001-2013 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 4.10
125
5.4 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 value 0x0000 is
reserved to set all cards into the Stand-by State with CMD7.
In UHS-II mode, Node ID is used as RCA. Refer to SD-TRAN Section of UHS-II Addendum for more
details.
5.5 DSR register (Optional)
The 16-bit driver stage register is described in detail in Chapter 0. 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.
5.6 SCR register
In addition to the CSD register, there is another configuration register named SD CARD Configuration
Register (SCR). SCR provides information on the SD Memory Card's special features that were
configured into the given card. The size of SCR register is 64 bits. This register shall be set in the
factory by the SD Memory Card manufacturer.
The following table describes the SCR register content.
Table 5-17: The SCR Fields
SCR_STRUCTURE
SCR Structure Version
SD Physical Layer Specification Version
0
SCR version 1.0
Version 1.01-4.00
1-15
reserved
Note: SD_SPEC is used to indicate SCR Structure Version instead of this field.
Table 5-18: SCR Register Structure Version
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]
Spec. Version 4.00 or higher
SD_SPEC4
1
R
[42]
Reserved
6
R
[41:36]
Command Support bits
CMD_SUPPORT
4
R
[35:32]
reserved for manufacturer usage
-
32
R
[31:0]