Product manual

Industrial Grade SD Card Interface Description

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 card 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.

8 READY_FOR_DATA S X ’0’= not ready

’1’= ready

Corresponds to buffer empty signalling on the

bus.

7:6

5 APP_CMD S R ‘0’ = Disabled

‘1’ = Enabled

The card will expect ACMD, or indication that the

command has been interpreted as ACMD.

4 Reserved

3 AKE_SEQ_ERROR

(SD Card Security 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 Industrial Grade SD Card 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 card only in

‘tran_state’ (card selected). The SD Status structure is listed in Table 3-29. The same abbreviations for ‘type’ and

‘clear condition’ were used as for the Card Status above.