Datasheet

447
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
• CAS: CAS Latency
The reset value is 2 cycles.
• DLL: Reset DLL
Reset value is 0.
This field defines the value of Reset DLL.
0: Disable DLL reset.
1: Enable DLL reset.
This value is used during the power-up sequence.
Note: This field is found only in DDR2-SDRAM devices.
• DIC: Output Driver Impedance Control
Reset value is 0. This field name may be described as “DS” in some memory datasheets and defines the output drive strength.
This value is used during the power-up sequence.
Note: This field is found only in DDR2-SDRAM devices.
• DIS_DLL: Disable DLL
Reset value is 0.
0: Enable DLL
1: Disable DLL
Note: This field is found only in DDR2-SDRAM devices.
• OCD: Off-chip Driver
Reset value is 7.
Note: SDRAM Controller supports only 2 values for OCD (default calibration and exit from calibration). These values MUST
be always programmed during the initialization sequence. The calibration default must be first programmed then exit
calibration and maintain settings must be programmed.
Note: This field is found only in DDR2-SDRAM devices.
CAS DDR2 CAS Latency SDR CAS Latency
0 Reserved Reserved
1 Reserved Reserved
2Reserved 2
33 3
4 Reserved Reserved
5 Reserved Reserved
6 Reserved Reserved
7 Reserved Reserved
Value Name Description
0 DDR1_2_NORMALSTRENGTH Normal driver strength
1 DDR1_2_WEAKSTRENGTH Weak driver strength
Value Name Description
0 DDR2_EXITCALIB Exit from OCD calibration mode exit and maintain settings
7 DDR2_DEFAULT_CALIB OCD calibration default