SanDisk SDSDB-016G-A11 Product Manual - Page 40

Status Register

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Revision 2.2 Chapter 3 - SD Card Interface Description SD Card Product Manual 3.5.4 Status Register The SD Card Status Register structure is defined in Table 3-29. The Type and Clear Condition fields in the table are coded as follows: Type: • E-Error bit • S-Status bit • R-Detected and set for the actual command response • X-Detected and set during command execution. The host must poll the card by sending status command in order 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 will clear it (with a delay of one command) • C-Clear by read. Table 3-29 Status Register Description Bit 31 30 29 28 27 26 25 24 23 22 21 20 Identifier OUT_OF_ RANGE ADDRESS_ ERROR Type E R X E R X BLOCK_LEN_ E R X ERROR ERASE_SEQ_ ERROR ERASE_ PARAM WP_ VIOLATION CARD_IS_ LOCKED LOC_UNLOCK _FAILED E R E R X E R X S X E R X COM_CRC_ ERROR ILLEGAL_ COMMAND CARD_ECC_ FAILED E R E R E R X CC_ERROR E R X Value 0 = no error 1 = error 0 = no error 1 = error 0 = no error 1 = error 0 = no error 1 = error 0 = no error 1 = error 0 = not protected 1 = protected 0 = unlocked 1 = locked 0 = no error 1 = error 0 = no error 1 = error 0 = no error 1 = error 0 = success 1 = failure 0 = no error 1 = error Description Clear Cond. The command's argument C was out of the allowed range for this card. A misaligned address that C did not match the block length was used in the command. The transferred block length C is not allowed for this card, or the number of transferred bytes does not match the block length. An error in the sequence of C erase commands occurred. An invalid selection of write- C blocks for erase occurred. Attempt to program a write- C protected block. When set, signals that the A card is locked by the host Set when a sequence or C password error has been detected in lock/ unlock card command or if there was an attempt to access a locked card The CRC check of the B previous command failed Command not legal for the B card state Card internal ECC was C applied but failed to correct the data. Internal card controller error C © 2004 SanDisk Corporation 3-20 12/08/04

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Chapter 3 – SD Card Interface Description
Revision 2.2
SD Card Product Manual
© 2004 SanDisk Corporation
3-20
12/08/04
3.5.4
Status Register
The SD Card Status Register structure is defined in Table 3-29.
The
Type
and
Clear
Condition
fields in the table are coded as follows:
Type:
•
E—Error bit
•
S—Status bit
•
R—Detected and set for the actual command response
•
X—Detected and set during command execution. The host must poll the card by
sending status command in order 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 will clear
it (with a delay of one command)
•
C—Clear by read.
Table 3-29
Status Register Description
Bit
Identifier
Type
Value
Description
Clear
Cond.
31
OUT_OF_
RANGE
E R X
0 = no error
1 = error
The command’s argument
was out of the allowed
range for this card.
C
30
ADDRESS_
ERROR
E R X
0 = no error
1 = error
A misaligned address that
did not match the block
length was used in the
command.
C
29
BLOCK_LEN_
ERROR
E R X
0 = no error
1 = error
The transferred block length
is not allowed for this card,
or the number of transferred
bytes does not match the
block length.
C
28
ERASE_SEQ_
ERROR
E R
0 = no error
1 = error
An error in the sequence of
erase commands occurred.
C
27
ERASE_
PARAM
E R X
0 = no error
1 = error
An invalid selection of write-
blocks for erase occurred.
C
26
WP_
VIOLATION
E R X
0 = not protected
1 = protected
Attempt to program a write-
protected block.
C
25
CARD_IS_
LOCKED
S X
0 = unlocked
1 = locked
When set, signals that the
card is locked by the host
A
24
LOC_UNLOCK
_FAILED
E R X
0 = no error
1 = error
Set when a sequence or
password error has been
detected in lock/ unlock card
command or if there was an
attempt to access a locked
card
C
23
COM_CRC_
ERROR
E R
0 = no error
1 = error
The CRC check of the
previous command failed
B
22
ILLEGAL_
COMMAND
E R
0 = no error
1 = error
Command not legal for the
card state
B
21
CARD_ECC_
FAILED
E R X
0 = success
1 = failure
Card internal ECC was
applied but failed to correct
the data.
C
20
CC_ERROR
E R X
0 = no error
1 = error
Internal card controller error
C