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7.2.2. A55 Core Power and Performance Trade-off
The operating frequency of the two A55 cores are controlled together via software, allowing you to make the optimum power and performance trade-off for the pair of cores in your application.
Software updates to ping-pong counter dividers have seamless transitions on output clocks. Therefore, software can dynamically change the frequency by changing the ping-pong counter value (integer divider), however, the input to the ping-pong counters cannot be changed dynamically.
The presence of a single software-controllable ping-pong counter for both A55 cores provides the opportunity for you to perform dynamic power management using your own software algorithms.
A software-controllable clock gate is provided for each A55 core to allow you to disable clocks when a CPU is powered but not in use. Dynamic clock gating is not supported.