Datasheet

467
SAM9G25 [DATASHEET]
11032D–ATARM–10-Mar-2014
• 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: Note: This field is found only in DDR2-SDRAM devices.
• DIC/DS: Output Driver Impedance Control
Reset value is 0.
This field defines the output drive strength.
0 = Normal driver strength.
1 = Weak driver strength.
This value is used during the power-up sequence. This parameter is found in the datasheet as DIC or DS.
Note: 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: Note: This field is found only in DDR2-SDRAM devices.
• OCD: Off-chip Driver
Reset value is 7.
Notes: 1. OCD is NOT supported by the controller, but these values MUST be programmed during the initialization sequence.
2. This field is found only in DDR2-SDRAM devices.
CAS DDR2 CAS Latency SDR CAS Latency
000 Reserved Reserved
001 Reserved Reserved
010 Reserved 2
011 33
100 Reserved Reserved
101 Reserved Reserved
110 Reserved Reserved
111 Reserved Reserved
OCD Use
000 OCD calibration mode exit, maintain setting
111 OCD calibration default