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The SPI Collator converts SPI wires into messages to be sent to the Distributor.
The following figure shows the SPI Collator block.
Individual SPIs can be synchronized into the SPI Collator, or the SPI Collator can be placed in the same clock domain as the interrupt sources and the messages that are synchronized into the Distributor.
Placing the SPI Collator in a clock domain that is always on and is remote from the GIC Distributor enables more aggressive power saving because the GIC Distributor can be clock gated hierarchically.