User Manual

TriFlash Interface Description
3-24 TriFlash with SD Interface Product Manual (Preliminary), Rev. 1.2 © 2002/2003 SANDISK CORPORATION
Bits Identifier Type Value Description Clear
Cond.
12:9 CURRENT_STATE S X 0 = idle
1 = ready
2 = ident
3 = stby
4 = tran
5 = data
6 = rcv
7 = prg
8 = dis
9-15 = Reserved
The state of the device when receiving the command. If
the command execution causes a state change, it will be
visible to the host in the response to the next command.
The four bits are interpreted as a binary coded
number
between 0 and 15.
B
8 READY_FOR_DATA S X ’0’= not ready ’1’= ready Corresponds to buffer empty signalling on the bus. A
7:6 Reserved
5 APP_CMD S R ‘0’ = Disabled
‘1’ = Enabled
The device will expect ACMD, or indication that the
command has been interpreted as ACMD.
C
4 Reserved
3 AKE_SEQ_ERROR
(TriFlash app. spec.)
E R ‘0’ = no error ‘1’ = error Error in the sequence of authentication process. C
2 Reserved for application specific commands
1, 0 Reserved for manufacturer test mode
3.5.6. SD Status
The SD Status contains status bits that are related to the SD bus proprietary features and may be used for future
application specific usage. The size of the SD Status is one data block of 512 bits. The content of this register is
transmitted to the host over the DAT bus along with 16 bits CRC. The SD Status is sent to the host over the DAT
bus if ACMD13 is sent (CMD55 followed with CMD13). ACMD13 can be sent to a device only in ‘tran_state’
(card selected). The SD Status structure is described in Table 3-29. The same abbreviations for ‘type’ and ‘clear
condition’ were used as for the Card Status above.
Table 3-29. SD Status
Bits Identifier Typ
e
Value Description Clear
Cond.
511:
510
DAT_BUS_WIDTH S R ‘00’=1 (default)
‘01’=Reserved
‘10’=4 bit width
‘11’=Reserved
Shows the currently defined data bus width
that was defined by the SET_BUS_WIDTH
command.
A
509 SECURED_MODE S R ‘0’=not in the mode
‘1’=in secured mode
Device is in Secured Mode of operation (refer
to the SD Security Specifications document).
A
508:
496
Reserved
495:
480
SD_CARD_TYPE S R ‘00xxh’=SD bus devices as
defined in Physical Spec.
Ver. 1
(‘x’=do not care).
In the future, the 8 LSBs will be used to define
different variations of an SD bus device (each
bit will define different SD types). The 8 MSBs
will be used to define SD Cards that do not
comply with the SD as defined in the
Specification Ver. 1.
A
479: SIZE_OF_PROTECTED_AREA S R Size of protected area (in Shows the size of the protected area. The A