Samsung S5PC110, Manual

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S5PC110_UM 1 DRAM CONTROLLER
1-33
1.4.1.7 PHY Control0 Register (PhyControl0, R/W, Address = 0xF000_0018, 0xF140_0018)
PHYCONTROL0 Bit Description R/W
Initial
State
ctrl_force [31:24] DLL Force Delay
This field is used instead of ctrl_lock_value[9:2] from the PHY
DLL when ctrl_dll_on is LOW. (i.e. If the DLL is off, this field is
used to generate 270' clock and shift DQS by 90'.)
R/W 0x0
ctrl_inc [23:16] DLL Delay Increment
Increase the amount of start point
This value should be 0x10
R/W 0x0
ctrl_start_point [15:8] DLL Lock Start Point
Initial DLL lock start point. This is the number of delay cells and
is the start point where "DLL" start tracing to lock. Calculates
Initial delay time by multiplying the unit delay of delay cell and
this value.
This value should be 0x10 R/W 0x0
dqs_delay [7:4] Delay Cycles for DQS Cleaning
This register is to enable PHY to clean incoming DQS signals
delayed by external circumstances. If DQS is coming with
read latency plus n mclk cycles, this registers must be set to n
mclk cycles. R/W 0x0
ctrl_dfdqs [3] Differential DQS
If enabled, PHY generates differential DQS out signals for write
command and receives differential DQS input signals for read
command. This function is used in case of DDR2/LPDDR2.
R/W 0x0
ctrl_half [2] DLL Low Speed
HIGH active signal to activate the low speed mode for DLL. If
this bit is set, DLL runs at low speed (80MHz ~ 100MHz) R/W 0x0
ctrl_dll_on [1] DLL On
HIGH active start signal to activate the DLL. This signal should
be kept HIGH for normal operation. If this signal becomes
LOW, DLL is turned off and ctrl_clock and ctrl_flock become
HIGH. This bit should be set before ctrl_start is set to turn on
the DLL
R/W 0x0
ctrl_start [0] DLL Start
HIGH active start signal to initiate the DLL run and lock. This
signal should be kept HIGH during normal operation. If this
signal becomes LOW, DLL stops running. To re-run DLL, make
this signal HIGH again. In the case of re-running, DLL loses
previous lock information. Before ctrl_start is set, make sure
that ctrl_dll_on is HIGH.
R/W 0x0