SanDisk SDSDH-1024 Product Manual - Page 51

Data Transfer Mode

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Revision 2.2 Chapter 4 - SD Card Protocol Description SanDisk SD Card Product Manual When the RCA is received, the card state changes to stand-by. At this point, if the host wants the card to have another RCA number, it may ask the card to publish a new number by sending another SEND_RELATIVE_ADDR command to the card. The last published relative card address is the actual RCA number of the card. The host repeats the identification process (i.e., the cycles with CMD2 and CMD3 for each card in the system). After all SD cards are initialized, the host will initialize any MultiMediaCard that is in the system (if any), using the CMD2 and CMD3 as specified in the MultiMediaCard specification.4 4.4 Data Transfer Mode Until the content of all CSD registers is known by the host, the fPP clock rate must remain at fOD because some cards may have operating frequency restrictions. The host issues SEND_CSD (CMD9) to obtain the card-specific data (e.g., block length, card storage capacity, and maximum clock rate). Figure 4-8 shows a block diagram of the Data Transfer Mode. Figure 4-8 SD Card State Diagram-Data Transfer Mode Card Identification Mode Data Transfer Mode CMD3 CMD15 CMD0 From all states in data-transfer mode CMD13, CMD55 No state transition in data-transfer mode Standby State (stby) CMD7 CMD7 Send-data State (data) CMD12, "operation complete" CMD6, 17, 18, 30, 56(r) ACMD13, 22, 51 Transfer State (trans) CMD16, 32...37, ACMD6, 42 ACMD23 CMD4, 9, 10, 3 CMD28, 29, 38 "operation complete" Disconnect State (dis) CMD7 CMD7 "operation complete" Programming State (prg) CMD24, 25, 26, 27, 42, 56(w) Receive-data State (rcv) CMD12 or "transfer end" CMD7 is used to select one SD Card and place it in the Transfer State; only one card can be in this state at a given time. If a previously selected card is in the Transfer State, its connection with the host is released and it will move back to the Stand-by State. When 4In the SD system, all cards are connected separately therefore each MultiMediaCard will be initialized individually. © 2004 SanDisk Corporation 4-7 12/08/04

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Chapter 4 – SD Card Protocol Description
Revision 2.2
SanDisk SD Card Product Manual
© 2004 SanDisk Corporation
4-7
12/08/04
When the RCA is received, the card state changes to stand-by. At this point, if the host
wants the card to have another RCA number, it may ask the card to publish a new number
by sending another SEND_RELATIVE_ADDR command to the card. The last published
relative card address is the actual RCA number of the card.
The host repeats the
identification process (i.e., the cycles with CMD2 and CMD3 for each card in the system).
After all SD cards are initialized, the host will initialize any MultiMediaCard that is in the
system (if any), using the CMD2 and CMD3 as specified in the MultiMediaCard
specification.
4
4.4
Data Transfer Mode
Until the content of all CSD registers is known by the host, the f
PP
clock rate must remain
at f
OD
because some cards may have operating frequency restrictions. The host issues
SEND_CSD (CMD9) to obtain the card-specific data (e.g., block length, card storage
capacity, and maximum clock rate). Figure 4-8 shows a block diagram of the Data Transfer
Mode.
Figure 4-8
SD Card State Diagram—Data Transfer Mode
CMD7 is used to select one SD Card and place it in the Transfer State; only one card can
be in this state at a given time. If a previously selected card is in the Transfer State, its
connection with the host is released and it will move back to the Stand-by State. When
4
In the SD system, all cards are connected separately therefore each MultiMediaCard will be initialized
individually.
Programming
State (prg)
CMD13, CMD55
CMD7
Disconnect
State (dis)
CMD4, 9, 10, 3
Standby State
(stby)
CMD12 or
"transfer end"
Receive-data
State (rcv)
CMD16, 32...37,
ACMD6, 42
ACMD23
No state transition in
data-transfer mode
From all states in
data-transfer mode
Card
Identification
Mode
CMD3
"operation
complete"
CMD15
CMD0
CMD7
CMD28, 29, 38
CMD7
CMD7
"operation
complete"
Data
Transfer
Mode
CMD24, 25, 26, 27, 42, 56(w)
CMD6, 17, 18, 30,
56(r) ACMD13, 22,
51
Send-data State
(data)
CMD12,
"operation
complete"
Transfer State
(trans)