Preliminary
HSMMC CONTROLLER
S3C2451X RISC MICROPROCESSOR
21-18
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.
SDMA SYSTEM ADDRESS REGISTER
Register Address
R/W
Description
Reset
Value
SYSAD0 0X4AC00000
R/W
System
Address register (Channel 0)
0x0
SYSAD1 0X4A800000
R/W
System
Address register (Channel 1)
0x0
This register contains the physical system memory address used for DMA transfers.
Name Bit
Description
Initial
Value
SYSAD [31:0]
SDMA System Address
This register contains the system memory address for a DMA transfer.
When the Host Controller stops a DMA transfer, this register shall point
to the system address of the next contiguous data position. It can be
accessed only if no transaction is executing (i.e., after a transaction has
stopped). Read operations during transfers may return an invalid value.
The Host Driver shall initialize this register before starting a DMA
transaction. After DMA has stopped, the next system address of the
next contiguous data position can be read from this register.
The DMA transfer waits at the every boundary specified by the
Host
SDMA Buffer Boundary
in the
Block Size
register. The Host Controller
generates
DMA Interrupt
to request the Host Driver to update this
register. The Host Driver set the next system address of the next data
position to this register. When the most upper byte of this register (003h)
is written, the Host Controller restarts the DMA transfer. When restarting
DMA by the Resume command or by setting
Continue Request
in the
Block Gap Control
register, the Host Controller shall start at the next
contiguous address stored here in the
System Address
register.
0x00