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RM0008
Table 129. SD status (continued)
Secure digital input/output interface (SDIO)
Bits
Identifier
Type
Value
Description
Clear
condition
In the future, the 8 LSBs will
’00xxh’= SD Memory Cards as
defined in Physical Spec Ver1.01-
2.00 (’x’= don’t care). The
be used to define different
variations of an SD memory
card (each bit will define
495: 480 SD_CARD_TYPE
SR
following cards are currently
different SD types). The 8
A
defined:
’0000’= Regular SD RD/WR Card.
’0001’= SD ROM Card
MSBs will be used to define
SD Cards that do not comply
with current SD physical
layer specification.
479: 448
SIZE_OF_PROTE
CT ED_AREA
SR
Size of protected area (See
below)
(See below)
A
447: 440 SPEED_CLASS
SR
Speed Class of the card (See
below)
(See below)
A
439: 432
431:428
PERFORMANCE_
MOVE
AU_SIZE
SR
SR
Performance of move indicated by
1 [MB/s] step.
(See below)
Size of AU
(See below)
(See below)
(See below)
A
A
427:424
Reserved
423:408
ERASE_SIZE
SR
Number of AUs to be erased at a
time
(See below)
A
Timeout value for erasing areas
407:402
ERASE_TIMEOUT S R
specified by
(See below)
A
UNIT_OF_ERASE_AU
401:400
ERASE_OFFSET
SR
Fixed offset value added to erase
time.
(See below)
A
399:312
311:0
Reserved
Reserved for Manufacturer
SIZE_OF_PROTECTED_AREA
Setting this field differs between standard- and high-capacity cards. In the case of a
standard-capacity card, the capacity of protected area is calculated as follows:
Protected area = SIZE_OF_PROTECTED_AREA_* MULT * BLOCK_LEN.
SIZE_OF_PROTECTED_AREA is specified by the unit in MULT*BLOCK_LEN.
In the case of a high-capacity card, the capacity of protected area is specified in this field:
Protected area = SIZE_OF_PROTECTED_AREA
SIZE_OF_PROTECTED_AREA is specified by the unit in bytes.
SPEED_CLASS
This 8-bit field indicates the speed class and the value can be calculated by P W /2 (where
P W is the write performance).
Doc ID 13902 Rev 9
483/995
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