ST STM32F40 Series Reference Manual page 873

Secure digital input/output interface (SDIO)
Table 137. SD status (continued)
Bits Identifier
495: 480 SD_CARD_TYPE
SIZE_OF_PROTE
479: 448
CT ED_AREA
447: 440 SPEED_CLASS
PERFORMANCE_
439: 432
MOVE
431:428 AU_SIZE
427:424 Reserved
423:408 ERASE_SIZE
407:402 ERASE_TIMEOUT S R
401:400 ERASE_OFFSET
399:312 Reserved
311:0 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
P is the write performance).
W
873/1422
Type Value
'00xxh'= SD Memory Cards as
defined in Physical Spec Ver1.01-
2.00 ('x'= don't care). The
S R following cards are currently
defined:
'0000'= Regular SD RD/WR Card.
'0001'= SD ROM Card
Size of protected area (See
S R
below)
Speed Class of the card (See
S R
below)
Performance of move indicated by
1 [MB/s] step.
S R
(See below)
Size of AU
S R
(See below)
Number of AUs to be erased at a
S R
time
Timeout value for erasing areas
specified by
UNIT_OF_ERASE_AU
Fixed offset value added to erase
S R
time.
Doc ID 018909 Rev 4
Description
In the future, the 8 LSBs will
be used to define different
variations of an SD memory
card (each bit will define
different SD types). The 8
MSBs will be used to define
SD Cards that do not comply
with current SD physical
layer specification.
(See below)
(See below)
(See below)
(See below)
(See below)
(See below)
(See below)
RM0090
Clear
condition
A
A
A
A
A
A
A
A
/2 (where
W