Samsung S5PC110 Manual page 577

S5PC110_UM
rst_n
ctrl_start_point
ctrl_inc
ctrl_start
ctrl_clock
ctrl_flock
ctrl_lock_value
ctrl_dll_on
ctrl_force
ctrl_resync
Use DLL to compensate Process, Voltage and Temperature (PVT) condition. Therefore DLL should not be turned-
off for reliable operation except for the case of frequency scaling (To lower frequency scaling is permitted)
Power up &
PLL lock
D L L Lo ck St art
NOTE:
Figure 1-11 DLL Lock Procedure
DLL Lock
Initialization
W rite c trl _s ta rt_p o in t v al ue
Wri te ctr l_ in c va lu e
D LL L oc ke d
R ea d & W rit e
R ef res h
Pe ri od
R ef res h
C M D
PHY DLL Lock Procedure
1 DRAM CONTROLLER
Memory
Memory Acess
D L L o n
D L L o ff
R e fre sh R efre s h
C MD C M D
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