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S3C2440A RISC MICROPROCESSOR MEMORY CONTROLLER
DEC.13, 2002
5-19
SDRAM MODE REGISTER SET REGISTER (MRSR)
Register Address R/W Description Reset Value
MRSRB6 0x4800002C R/W Mode register set register bank6 xxx
MRSRB7 0x48000030 R/W Mode register set register bank7 xxx
MRSR Bit Description Initial State
Reserved [11:10] Not used -
WBL [9] Write burst length
0: Burst (Fixed)
1: Reserved
x
TM [8:7] Test mode
00: Mode register set (Fixed)
01, 10 and 11: Reserved
xx
CL [6:4] CAS latency
000 = 1 clock, 010 = 2 clocks, 011=3 clocks
Others: reserved
xxx
BT [3] Burst type
0: Sequential (Fixed)
1: Reserved
x
BL [2:0] Burst length
000: 1 (Fixed)
Others: Reserved
xxx
Note:
MRSR register must not be reconfigured while the code is running on SDRAM.
IMPORTANT NOTE: IN SLEEP MODE, SDRAM HAS TO ENTER SDRAM SELF-REFRESH MODE.