8.4.4.6 Low-Power States

The TZC implements low-power states which can be entered automatically. When no further bus transactions are detected, the associated filter is automatically switched to Low-power state. When a bus transaction arrives while in Low-power state, the clock exits the Low-power state.

The control unit enters Low-power state when there is no configuration access.

Exiting from Low-power states requires some clock cycles. To privilege performance/low latency, the low-power mechanism must be disabled (default); to privilege low power consumption, the low-power mechanism must be enabled.

See TZC_SYS_LPR and TZC_CPU_LPR.