SanDisk SDSDH-1024 Product Manual - Page 69

Switch Function Flow Example, Switch Function Flow, Example for checking

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Revision 2.2 Chapter 4 - SD Card Protocol Description SanDisk SD Card Product Manual Switch Function Flow Example The host is recommended to take the following flow for switching the function. Figure 4-12 Switch Function Flow Start Spec 1.0-1.10 Card version no.? Spec 1.10 or higher func

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Chapter 4 – SD Card Protocol Description
Revision 2.2
SanDisk SD Card Product Manual
© 2004 SanDisk Corporation
4-25
12/08/04
Switch Function Flow Example
The host is recommended to take the following flow for switching the function.
Figure 4-12
Switch Function Flow
Example for checking
Card condition
Support function = command system : For eC(0x1),
access mode : High-speed(0x1)
Current function = command system : For eC(0x1),
access mode : Default(0x0)
Switch example : command system : For eC => Default,
access mode : Default => High-speed
Case (1)
– Check function with no error
CMD6 argument = ‘0000 0000 1111 1111 1111 1111 0000 0001’
Read Data = [511:496] = ‘0000 0000 0010 0000’ (=64mA)
[495:400] = ‘1000 0000 0000 0001’ & ‘1000 0000 0000 0001’ & ‘1000 0000 0000 0001’&
‘1000 0000 0000 0001’ & ‘1000 0000 0000 0011’ & ‘1000 0000 0000 0011’
[399:376] = ‘0000 0000 0000 0000 0000 0001’
[375:0] = Reserved (All 0s)
Start
Card version no.?
func<-don't care
CMD6
(mode=0,func)
Any switch?
func<-funcx
CMD6
(mode=0,func)
Current
acceptable?
func<-funcx
CMD6
(mode=1,func)
Complete?
End
Give up
Spec 1.0-1.10
N
N
N
Y
Y
Y
Spec 1.10 or higher
func:function setting
Get switchable function
Get current consumption
func:certain function setting
func:certain function setting
For eC
No influence
High-speed
Default