Samsung S3C6400X User Manual page 915

S3C6400X RISC MICROPROCESSOR
POWER CONTROL REGISTER
This register contains the SD Command Argument.
Register
PWRCON0 0x7C200029
PWRCON1 0x7C300029
PWRCON2 0x7C400029
Name Bit
[7:4]
Reserved
SD Bus Voltage Select
[3:1]
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
SD Bus Power
[0]
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
Address R/W
R/W
R/W
R/W
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.
Description
Present State Register (Channel 0)
Present State Register (Channel 1)
Present State Register (Channel 2)
Description
HSMMC CONTROLLER
Reset Value
0x0
0x0
0x0
Initial Value
0
0
27-39