Samsung S5PC100, Руководство пользователя

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S5PC100 USER’S MANUAL (REV1.0) DRAM CONTROLLER
5.1-25
4.2.7 PHY Control0 Register (PhyControl0, R/W, Address=0xE600_0018)
PHYCONTROL0 Bit Description R/W
Reset
Value
ctrl_force [31:24]
DLL Force Delay
This field is used instead of ctrl_lock_value[9:2] from the 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
ctrl_fnc_fb [7:5]
Function Feedback Test
0x0 = Normal Operation Mode,
0x1 = Reserved,
0x2 = External FNC feedback test mode,
0x3 = Internal FNC feedback test mode,
0x4 = Board PHY external read feedback,
0x5 = Board PHY internal read feedback,
0x6 = Board PHY internal write feedback,
0x7 = Reserved
R/W 0x0
Reserved [4] Should be zero
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 turn on 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 turn on 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 kept set before ctrl_start is set to turn on the
DLL
R/W 0x0
ctrl_start [0]
DLL Start
HIGH active start signal to make 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