Analog Devices SHARC ADSP-214 Series Hardware Reference Manual page 864

ADSP-2146x External Port Registers
Table A-18. DDR2STAT0 Register Bit Descriptions (RO)
Bit Name
0 DDR2CI
1 DDR2SRA
2 DDR2PUA
3 DDR2RS
4 DDR2MSE
5 Reserved
6 DDR2PD
7 DDR2DLLCAL
8 DDR2DLLCAL
DONE
15–9 Reserved
A-38
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Description
Controller Idle Status.
0 = Controller busy performing access or auto-refresh
1 = Controller idle
Self-Refresh Active.
0 = Not in self-refresh mode
1 = Active
Power-Up Sequence Active.
0 = DDR2 not in power-up
1 = DDR2 in power-up initialization sequence
DLL Reset.
0 = A power-up to DDR2 has been initialized since last DDR2
controller reset
1 = No power-up sequence occurred since last DDR2 controller
reset
Access Error.
0 = No Error
1 = An access request to DDR2 lost because controller external
pins are in disabled state (DIS_DDCTL set)
Write a 0 to clear this bit (if set, sticky bit).
Precharge Power-Down Status.
0 = Not in precharge power-down
1 = DDR2 in precharge power-down state (DIS_DDR2CKE bit
set and DDR2CKE signal deasserted)
DLL Calibration Status.
0 = Not in DLL calibration sequence
1 = DLL calibration active
DLL Calibration Complete.
0 = A DLL calibration sequence is not happened since last
DDR2 controller reset
1 = A DLL calibration sequence occurred since last DDR2 con-
troller reset
The DLL calibration process is performed regardless of whether
an external DDR2 bank is assigned or not.
ADSP-214xx SHARC Processor Hardware Reference