On i.MX95, OD, ND, and LD represent different system operating modes used to balance performance and power consumption. OD (OverDrive) mode targets the highest performance, allowing higher clock frequencies with a higher SoC supply voltage. ND (Nominal Drive) mode provides the standard operating point for normal performance and power efficiency. LD (Low Drive) mode is intended for lower-power operation, reducing voltage and limiting clock frequencies to save energy. In practice, switching between these modes involves coordinated changes of VDD_SOC, system clocks, and DDR operating frequency so that the device can move between high-performance and low-power states safely and efficiently.
Here is a table about the Maximum frequency of modules of different modes.
|
|
OverDrive Mode
|
Nominal Mode
|
LowDrive Mode
|
|
VDD_SOC (typical)
|
0.9 V
|
0.85 V
|
0.8 V
|
|
VDD_ARM (typical)
|
0.9 V
|
0.85 V
|
0.8 V
|
|
A55 frequency
|
1800 MHz
|
1400 MHz
|
900 MHz
|
|
NPU frequency
|
1000 MHz
|
800 MHz
|
500 MHz
|
|
ISI frequency
|
667 MHz
|
500 MHz
|
333 MHz
|
|
GPU frequency
|
500 MHz
|
500 MHz
|
500 MHz
|
|
Display frequency
|
800 MHz
|
666 MHz
|
400 MHz
|
|
VPU frequency
|
666 MHz
|
500 MHz
|
333 MHz
|
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