SanDisk SDSDH-1024 Product Manual - Page 42

SD Status Register, Relative Card Address Register

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Revision 2.2 Chapter 3 - SD Card Interface Description SD Card Product Manual 3.5.5 3.5.6 SD Status Register The SD Status Register contains status bits that are related to the SD Card proprietary features and may be used for future application specific usage. The size of the SD Status is one data block of 512 bits. The content of this register is transmitted to the Host over the DAT bus along with 16 bits CRC. The SD Status is sent to the host over the DAT bus if ACMD13 is sent (CMD55 followed with CMD13). ACMD13 can be sent to a card only in 'tran_state' (card selected). The SD Status structure is listed in Table 3-30. The same abbreviations for 'type' and 'clear condition' were used as for the Card Status above. Table 3-30 SD Card Status Bits Identifier 511- DAT_BUS_WIDTH 510 509 SECURED_MODE 508496 495- SD_CARD_TYPE 480 479- SIZE_OF_PROTECTED_ 448 AREA 447312 3110 Type Value Description Clear Cond. S R 00=1 (default) Shows the currently defined data A 01=reserved bus width that was defined by the 10= 4-bit width SET_BUS_WIDTH command 11=reserved S R 0=not in the Card is in Secured Mode of A mode operation (refer to the SD 1=secured Security Specifications mode document). Reserved S R '00xxh'=SD In the future, the 8 LSBs will be A Memory Cards used to define different variations as defined in of an SD Card (each bit will Physical Spec. define different SD types). The 8 Ver. MSBs will be used to define SD 1.01('x'=don't Cards that do not comply with care).The the SD Memory Card as defined following cards in the Specification Ver. 1.01 are currently defined:'0000' =Regular SD RD/WR Card.'0001'= SD ROM Card S R Size of Shows the size of the protected A protected area area. The actual area = (in units of (SIZE_OF_PROTECTED_AREA) MULT*BLOCK * MULT * BLOCK_LEN. _LEN refer to CSD register). Reserved Reserved for manufacturer Relative Card Address Register The 16-bit Relative Card Address (RCA) 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. © 2004 SanDisk Corporation 3-22 12/08/04

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Chapter 3 – SD Card Interface Description
Revision 2.2
SD Card Product Manual
© 2004 SanDisk Corporation
3-22
12/08/04
3.5.5
SD Status Register
The SD Status Register contains status bits that are related to the SD Card proprietary
features and may be used for future application specific usage. The size of the SD Status is
one data block of 512 bits. The content of this register is transmitted to the Host over the
DAT bus along with 16 bits CRC. The SD Status is sent to the host over the DAT bus if
ACMD13 is sent (CMD55 followed with CMD13). ACMD13 can be sent to a card only in
‘tran_state’ (card selected). The SD Status structure is listed in Table 3-30. The same
abbreviations for ‘type’ and ‘clear condition’ were used as for the Card Status above.
Table 3-30
SD Card Status
Bits
Identifier
Type
Value
Description
Clear
Cond.
511-
510
DAT_BUS_WIDTH
S R
00=1 (default)
01=reserved
10= 4-bit width
11=reserved
Shows the currently defined data
bus width that was defined by the
SET_BUS_WIDTH command
A
509
SECURED_MODE
S R
0=not in the
mode
1=secured
mode
Card is in Secured Mode of
operation (refer to the SD
Security Specifications
document).
A
508-
496
Reserved
495-
480
SD_CARD_TYPE
S R
‘00xxh’=SD
Memory Cards
as defined in
Physical Spec.
Ver.
1.01(‘x’=don’t
care).The
following cards
are currently
defined:‘0000’
=Regular SD
RD/WR
Card.‘0001’=
SD ROM Card
In the future, the 8 LSBs will be
used to define different variations
of an SD Card (each bit will
define different SD types). The 8
MSBs will be used to define SD
Cards that do not comply with
the SD Memory Card as defined
in the Specification Ver. 1.01
A
479-
448
SIZE_OF_PROTECTED_
AREA
S R
Size of
protected area
(in units of
MULT*BLOCK
_LEN refer to
CSD register).
Shows the size of the protected
area. The actual area =
(SIZE_OF_PROTECTED_AREA)
* MULT * BLOCK_LEN.
A
447-
312
Reserved
311-
0
Reserved for manufacturer
3.5.6
Relative Card Address Register
The 16-bit
Relative Card Address (RCA)
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.