RM0390 Rev 4 1003/1328
RM0390 Secure digital input/output interface (SDIO)
1031
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).
439: 432
PERFORMANCE_
MOVE
S R
Performance of move indicated by
1 [MB/s] step.
(See below)
(See below) A
431:428 AU_SIZE S R
Size of AU
(See below)
(See below) A
427:424 Reserved
423:408 ERASE_SIZE S R
Number of AUs to be erased at a
time
(See below) A
407:402 ERASE_TIMEOUT S R
Timeout value for erasing areas
specified by
UNIT_OF_ERASE_AU
(See below) A
401:400 ERASE_OFFSET S R
Fixed offset value added to erase
time.
(See below) A
399:312 Reserved
311:0 Reserved for Manufacturer
Table 190. SD status (continued)
Bits Identifier Type Value Description
Clear
condition
Table 191. Speed class code field
SPEED_CLASS Value definition
00h Class 0
01h Class 2
02h Class 4
03h Class 6
04h – FFh Reserved
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