8 ddrsdrc dll information – Rainbow Electronics AT91CAP9S250A User Manual
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6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
23.6.8
DDRSDRC DLL Information
Register Name:
DDRSDRC_DLL
Access Type:
Read
Reset Value:
See
The DLL logic is internally used by the controller in oder to delay DQS inputs.This is necessary to center the strobe time
and the data valid window.
• MDINC: DLL Master Delay Increment
0: The DLL is not incrementing the Master delay counter.
1: The DLL is incrementing the Master delay counter.
• MDDEC: DLL Master Delay Decrement
0: The DLL is not decrementing the Master delay counter.
1: The DLL is decrementing the Master delay counter.
• MDOV
:
DLL Master Delay Overflow Flag
0: The Master delay counter has not reached its maximum value, or the Master is not locked yet.
1: The Master delay counter has reached its maximum value, the Master delay counter increment is stopped and the DLL
forces the Master lock. If this flag is set, it means the DDRSDRC clock frequency is too low compared to Master delay line
number of elements.
• SDCOVF
:
DLL Slave Delay Correction Overflow Flag.
0: Due to the correction, the Slave delay counter has not reached its maximum value, or the Slave is not locked yet.
1: Due to the correction, the Slave delay counter has reached its maximum value, the correction is not optimal because it is
not applied entirely.
• SDCUDF
:
DLL Slave Delay Correction Underflow Flag
0: Due to the correction, the Slave delay counter has not reached its minimum value, or the Slave is not locked yet.
1: Due to the correction, the Slave delay counter has reached its minimum value, the correction is not optimal because it
has not been entirely applied.
• SDERF
:
DLL Slave Delay Correction Error Flag
0: The DLL has succeeded in computing the Slave delay correction, or the Slave is not locked yet.
31
30
29
28
27
26
25
24
SDCVAL
23
22
21
20
19
18
17
16
SDVAL
15
14
13
12
11
10
9
8
MDVAL
7
6
5
4
3
2
1
0
–
–
SDERF
SDCUDF
SDCOVF
MDOVF
MDDEC
MDINC