DocID024597 Rev 3 1421/1693
RM0351 SD/SDIO/MMC card host interface (SDMMC)
1450
Type:
• E: error bit
• S: status bit
• R: detected and set for the actual command response
• X: detected and set during command execution. The SDMMC card Host must poll the
card by issuing the status command to read these bits
Clear condition:
• A: according to the card current state
• B: always related to the previous command. Reception of a valid command clears it
(with a delay of one command)
• C: clear by read
Table 229. SD status
Bits Identifier Type Value Description
Clear
condition
511: 510 DAT_BUS_WIDTH S R
’00’= 1 (default)
‘01’= reserved
‘10’= 4 bit width
‘11’= reserved
Shows the currently defined
databus width that was
defined by
SET_BUS_WIDTH
command
A
509 SECURED_MODE S R
’0’= Not in the mode
’1’= In Secured Mode
Card is in Secured Mode of
operation (refer to the “SD
Security Specification”).
A
508: 496 Reserved
495: 480 SD_CARD_TYPE S R
’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
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.
A
479: 448
SIZE_OF_PROTE
CT ED_AREA
S R
Size of protected area (See
below)
(See below) A
447: 440 SPEED_CLASS S R
Speed Class of the card (See
below)
(See below) A
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
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