SanDisk SD032 Manual descarregar pdf (Página 72)

4.8.4. Detailed Command Description

Tables 4-3 through 4-9 define in detail the miniSD Card bus commands.

Table 4-5. Basic Commands and Stream Read Commands (Class 0 And Class 1)

Cmd

Index

Type Argument Resp Abbreviation Command Description

CMD0 bc [31:0] don’t care* - GO_IDLE_STATE Resets all cards to Idle State.

CMD1 Reserved

CMD2 bcr [31:0] don’t care* R2 ALL_SEND_CID Asks any card to send their CID numbers on the

CMD line. (Any card that is connected to the host

will respond.)

CMD3 bcr [31:0] don’t care* R6 SEND_RELATIVE_

ADDR

Asks the card to publish a new relative address

(RCA).

CMD4

Not Supported

CMD5 Reserved

CMD6 Reserved

CMD7 ac [31:16] RCA

[15:0] don’t care*

(only

from the

selected

card)

SELECT/DESELECT_

CARD

Command toggles a card between the Stand-by

and Transfer states or between the Programming

and Disconnect state.

In both cases the card is selected by its own

relative address and deselected by any other

address; address 0 deselects all. When the RCA

equals 0, the host may do one of the following:

—use other RCA number to perform card de-

selection or

—re-send CMD3 to change its RCA number to

other then 0 and then use CMD7 with RCA=0 for

card de-selection.

CMD8 Reserved

CMD9 ac [31:16] RCA

[15:0] don’t care*

R2 SEND_CSD Addressed card sends its card-specific data (CSD)

on the CMD line.

CMD10 ac [31:16] RCA

[15:0] don’t care*

R2 SEND_CID Addressed card sends its card identification (CID)

on the CMD line.

CMD12 ac [31:0] don’t care* R1b

STOP_

TRANSMISSION

Terminates a multiple block read/write operation.

CMD13 ac [31:16] RCA

[15:0] don’t care*

R1 SEND_STATUS Addressed card sends its status register.

CMD14 Reserved

CMD15 ac [31:16] RCA

[15:0] don’t care*

- GO_INACTIVE_

STATE

Sets the card to inactive state.

* The bit places must be filled but the value is irrelevant.

Table 4-7. Block Read Commands (Class 2)

Cmd

Index

Type Argument Resp Abbreviation Command Description

CMD16 ac [31:0] block length R1 SET_BLOCKLEN Selects a block length (in bytes) for all following

block commands (read and write).

1) The DSR option (as well as the SET_DSR command) is not supported by the SanDisk miniSD Card.

2) The card may become busy after this command. Refer to Figure 5-25 for more details.

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