RM0090: Reference manual - STMicroelectronics

Secure digital input/output interface (SDIO) RM0090
Table 135. SD status (continued)
Bits Identifier Type Value Description
495: 480 SD_CARD_TYPE S R
479: 448 SIZE_OF_PROTE
CT ED_AREA
S R
447: 440 SPEED_CLASS S R
439: 432 PERFORMANCE_
MOVE
S R
431:428 AU_SIZE S R
427:424 Reserved
423:408 ERASE_SIZE S R
407:402 ERASE_TIMEOUT S R
401:400 ERASE_OFFSET S R
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
’00xxh’= SD Memory Cards as
defined in Physical Spec Ver1.01-
2.00 (’x’= don’t care). The
following cards are currently
defined:
’0000’= Regular SD RD/WR Card.
’0001’= SD ROM Card
Size of protected area (See
below)
Speed Class of the card (See
below)
Performance of move indicated by
1 [MB/s] step.
(See below)
Size of AU
(See below)
Number of AUs to be erased at a
time
Timeout value for erasing areas
specified by
UNIT_OF_ERASE_AU
Fixed offset value added to erase
time.
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).
869/1416 Doc ID 018909 Rev 3
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) A
(See below) A
(See below) A
(See below) A
(See below) A
(See below) A
(See below) A
Clear
condition
A