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P5040/P5020 Reference Design Board User Guide, Rev. 0
Freescale Semiconductor
9
Architecture
Figure 4. DDR interface
5.1.1.1
DDR Power
P5040/P5020RDB DDR power supplies these voltages.
The P5040/P5020RDB uses the Linear Technology LTC3876 (U55) switching power controller as
follows:
•
Dual-phase controller for up to 20 A at a default at 1.35 v adjustable to 1.5 V output.
•
Supplies GVDD, VREF, and VTT for SODIMM DRAM DDR3 and P5040/P5020 DDR controller.
Figure 5. DDR Power Supply
Voltage Name
Voltage
Current
Note
GVDD
1.5V/1.35V
> 10A
DRAM core and IO
MVREF
0.75V/0.675V
>= 10mA
DRAM reference voltage
VTT
0.75V/0.675V
>= 3A
Bus termination supply