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The Redistributor has a single Q-Channel input that is used to ensure that the Redistributor can be safely clock-gated hierarchically.
If the Redistributor is busy, actively processing interrupts or sending messages up or downstream, the Q‑Channel denies a quiescence request, qreqn, by asserting the qdeny signal. For more information, see the AMBA® Low Power Interface Specification, Arm® Q‑Channel and P‑Channel Interfaces.
The qreqn input is synchronized inside the Redistributor.
The qactive signal is connected to the PPI wires directly, and must be considered as an asynchronous output.