SanDisk SD032 Manual descarregar pdf (Página 57)

SanDisk miniSD cards have two operation modes.

• Card Identification Mode—The host will be in card identification mode after reset and while it is

looking for new cards on the bus. miniSD Card s will be in this mode after reset until the SEND_RCA

command (CMD3) is received.

• Data Transfer Mode— miniSD Cards will enter data transfer mode once their RCA is first published.

The host will enter data transfer mode after identifying all of the miniSD Cards on the bus.

Table 4-1 lists the dependencies between operation modes and card states. Each state in the miniSD Card state

diagram (Figures 4-7 and 4-8) is associated with one operation mode.

Table 4-1. Overview of Card States vs. Operation Modes

Card State Operation Mode

Inactive State Inactive

Idle State

Ready State Card Identification Mode

Identification State

Stand-by State

Transfer State

Sending-data State Data Transfer Mode

Receive-data State

Programming State

Disconnect State

4.3. Card Identification Mode

While in Card Identification Mode, the host resets all the cards that are in Card Identification Mode, validates

operation voltage range, identifies cards and asks them to publish a Relative Card Address (RCA). This operation is

done to each card separately on its own command (CMD) line. All data communication in the Card Identification

Mode uses the CMD line only.

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SanDisk SD032 Manual Página 57