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The SPI Collator has a clock Q-Channel interface that accepts requests from an external clock gating source, such as the system clock controller.
When signal qactive_clk_col is LOW, it indicates that all SPI toggles and level transitions have been passed to the Distributor, and that the SPI Collator does not require the clock.
If qactive_clk_col is HIGH, the SPI Collator rejects any attempt to enter a low-power mode.
If qreqn_clk_col is LOW and is accepted, the SPI Collator enters low-power mode and no new messages are sent to the Distributor until it enters low-power mode. If any interrupt line changes state, qactive_clk_col is asserted.