The SPI Collator converts SPI wires into messages to be sent to the Distributor.
The following figure shows the SPI Collator block.
Figure 2-6 SPI Collator
Individual SPIs can be synchronized into the SPI Collator, or the SPI Collator can be placed in the same domain as the interrupt sources and the messages that are synchronized into the Distributor.
Placing the SPI Collator in an always On domain that is remote from the GIC Distributor enables more aggressive power saving because the GIC Distributor can be clock gated hierarchically.
spi_r wires are SPI outputs after synchronization and edge detection. They can be used for cross-domain pulse detection.
This section contains the following subsections: