
PRELIMINARY
HSMMC CONTROLLER
S3C6400X RISC MICROPROCESSOR
27-44
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.
This bit is set to 1 when SD Clock output is stable after writing to
SD Clock
Enable
in this register to 1. The SD Host Driver waits to issue command to start
until this bit is set to 1.
(ROC)
‘1’ = Ready
‘0’ = Not Ready
[2]
SD Clock Enable
The Host Controller stops
SDCLK
when writing this bit to 0.
SDCLK Frequency
Select
can be changed when this bit is 0. Then, the Host Controller shall maintain
the same clock frequency until
SDCLK
is stopped (Stop at
SDCLK
=0). If the
Card
Inserted
in the
Present State register
is cleared, this bit will be cleared.
(RW)
‘1’ = Enable
‘0’ = Disable
0
[1]
Internal Clock Stable
This bit is set to 1 when SD Clock is stable after writing to
Internal Clock Enable
in this register to 1. The SD Host Driver shall wait to set
SD Clock Enable
until this
bit is set to 1.
Note:
This is useful when using PLL for a clock oscillator that requires setup time.
(ROC)
‘1’ = Ready
‘0’ = Not Ready
0
[0]
Internal Clock Enable
This bit is set to 0 when the Host Driver is not using the Host Controller or the
Host Controller awaits a wakeup interrupt. The Host Controller must stop its
internal clock to go very low power state. Still, registers shall be able to be read and
written. Clock starts to oscillate when this bit is set to 1. When clock oscillation is
stable, the Host Controller can be set
Internal Clock Stable
in this register to 1.
This bit shall not affect card detection.
(RW)
‘1’ = Oscillate
‘0’ = Stop