SanDisk SDSDH-1024 Product Manual - Page 82

Card State Transition

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Revision 2.2 Chapter 4 - SD Card Protocol Description SanDisk SD Card Product Manual ACMD Index ACMD42 Type Argument Resp. ac [31:1] stuff R1 bits [0] set_cd Abbreviation SET_CLR_CARD_DETECT ACMD43 ACMD49 ACMD51 --- --- --- adtc [31:0] stuff R1 bits --SEND_SCR Command Description Connect[1]/Disconnect[0] the 50KOhm pull-up resistor on CD/DAT3 (pin 1) of the card. Reserved for SD security applications. Reads the SD Configuration Register (SCR). 4.9 Card State Transition Table 4-18 defines the SD card state-transition (dependent on the received command). The SD Card application-specific command state-transitions can be found in Class 8. Table 4-18 Card State Transition Table Current Status idle ready ident stby tran data rcv prg dis ina State Change Trigger Changes to Class Independent "Operation --- --- --- --- --- --- --- tran stby --- complete" Class 0 CMD0 idle idle idle idle idle idle idle idle idle --- CMD2 --- ident --- --- --- --- --- --- --- --- CMD3 --- --- stby stby --- --- --- --- --- --- CMD4 --- --- --- stby --- --- --- --- --- --- CMD7, card is --- --- --- tran --- --- --- --- prg --- addressed CMD7, card is --- --- --- stby stby stby --- dis --- --- not addressed CMD9 --- --- --- stby --- --- --- --- --- --- CMD10 --- --- --- stby --- --- --- --- --- --- CMD12 --- --- --- --- --- tran prg --- --- --- CMD13 --- --- --- stby tran data rcv prg dis --- CMD15 --- --- --- ina ina ina ina ina ina --- Class 2 CMD16 CMD17 CMD18 --- --- --- --- tran --- --- --- --- --- --- --- --- --- data --- --- --- --- --- --- --- --- --- data --- --- --- --- --- Class 4 CMD16 see class 2 © 2004 SanDisk Corporation 4-38 12/08/04

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Chapter 4 – SD Card Protocol Description
Revision 2.2
SanDisk SD Card Product Manual
© 2004 SanDisk Corporation
4-38
12/08/04
ACMD Index
Type
Argument
Resp.
Abbreviation
Command Description
ACMD42
ac
[31:1] stuff
bits [0]
set_cd
R1
SET_CLR_CARD_DETECT
Connect[1]/Disconnect[0]
the 50KOhm pull-up
resistor on CD/DAT3 (pin
1) of the card.
ACMD43
ACMD49
---
---
---
---
Reserved for SD security
applications.
ACMD51
adtc
[31:0] stuff
bits
R1
SEND_SCR
Reads the SD
Configuration Register
(SCR).
4.9
Card State Transition
Table 4-18 defines the SD card state-transition (dependent on the received command).
The
SD Card application-specific command state-transitions can be found in Class 8.
Table 4-18
Card State Transition Table
Current Status
idle
ready
ident
stby
tran
data
rcv
prg
dis
ina
State Change
Trigger
Changes to
Class
Independent
“Operation
complete”
---
---
---
---
---
---
---
tran
stby
---
Class 0
CMD0
idle
idle
idle
idle
idle
idle
idle
idle
idle
---
CMD2
---
ident
---
---
---
---
---
---
---
---
CMD3
---
---
stby
stby
---
---
---
---
---
---
CMD4
---
---
---
stby
---
---
---
---
---
---
CMD7, card is
addressed
---
---
---
tran
---
---
---
---
prg
---
CMD7, card is
not addressed
---
---
---
stby
stby
stby
---
dis
---
---
CMD9
---
---
---
stby
---
---
---
---
---
---
CMD10
---
---
---
stby
---
---
---
---
---
---
CMD12
---
---
---
---
---
tran
prg
---
---
---
CMD13
---
---
---
stby
tran
data
rcv
prg
dis
---
CMD15
---
---
---
ina
ina
ina
ina
ina
ina
---
Class 2
CMD16
---
---
---
---
tran
---
---
---
---
---
CMD17
---
---
---
---
data
---
---
---
---
---
CMD18
---
---
---
---
data
---
---
---
---
---
Class 4
CMD16
see class 2