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PRELIMINARY
S3C6400X RISC MICROPROCESSOR
HSMMC CONTROLLER
27-39
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
POWER CONTROL REGISTER
This register contains the SD Command Argument.
Register
Address
R/W
Description
Reset Value
PWRCON0 0x7C200029 R/W
Present
State Register (Channel 0)
0x0
PWRCON1 0x7C300029 R/W
Present
State Register (Channel 1)
0x0
PWRCON2 0x7C400029 R/W
Present
State Register (Channel 2)
0x0
Name
Bit
Description
Initial Value
[7:4]
Reserved
[3:1]
SD Bus Voltage Select
By setting these bits, the Host Driver selects the voltage level for the SD card.
Before setting this register, the Host Driver will check the
Voltage Support
bits
in the
Capabilities
register. If an unsupported voltage is selected, the Host
System will not supply SD Bus voltage.
‘111b’ = 3.3V (Typ.)
‘110b’ = 3.0V (Typ.)
‘101b’ = 1.8V (Typ.)
‘100b’ – ‘000b’ = Reserved
0
[0]
SD Bus Power
Before setting this bit, the SD Host Driver will set
SD Bus Voltage Select
. If the
Host Controller detects the No Card state, this bit will be cleared.
If this bit is cleared, the Host Controller will immediately stop driving
CMD
and
DAT[3:0]
(tri-state) and drive
SDCLK
to low level.
‘1’ = Power on
‘0’ = Power off
0