Preliminary
S3C2451X RISC MICROPROCESSOR
MOBILE DRAM CONTROLLER
6-
15
Mobile DRAM Refresh CONTROL REGISTER
Register Address
R/W
Description
Reset
Value
REFRESH
0x48000010
R/W
Mobile DRAM refresh control register
0x0000_0020
REFRESH Bit
Description
Initial
State
Reserved [31:16]
Reserved
0x0000
REFCYC [15:0]
DRAM refresh cycle.
Example:
Refresh period is 15.6us, and HCLK is 66MHz. The
value of REFCYC is as follows:
REFCYC = 15.6 x 10
-6
x 66 x 10
6
= 1029
0x0020
MOBILE DRAM WRITE BUFFER TIME OUT REGISTER
A write to a enabling write buffer loads the value in the timeout register into timeout down counter of the buffer.
When the timeout counter reached 0 the contents of write buffer is flushed to the external DRAM. The down
counter is clocked HCLK. Writing a value of 0 in the TIMEOUT register disables the write buffer timeout function.
Register Address
R/W
Description
Reset
Value
TIMEOUT
0x48000014
R/W
Write Buffer Time out control register
0x0000_0000
TIMEOUT Bit
Description
Initial
State
Reserved [31:16]
Reserved
0x0000
TIMEOUT
[15:0]
Write buffer time-out delay time
0x0000