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The Redistributor is responsible for PPIs and SGIs that are associated with its related cluster or group of cores. A Redistributor is also referred to as a PPI block.

The following figure shows the Redistributor block.

Figure 2-2 GIC-600 Redistributor

The Redistributor performs the following functions:

  • Maintaining the SGI and PPI programming.
  • Monitoring, and if necessary, synchronizing the PPI wires.
  • Prioritizing SGIs, PPIs, and any other interrupts that are sent from the Distributor, and forwarding them to the core.
  • Maintaining the GIC Stream protocol and communicating with the cluster.

There can be multiple Redistributors in a configuration and they can be sized to match your system. For example, if you have two clusters of eight cores, then you can have one Redistributor positioned next to each cluster. You can use a Redistributor for each cluster to reduce the PPI wiring and enable the Redistributor to be powered down with the cores for extra power savings. Alternatively, for a small system, combining all cores into one Redistributor block might be the best solution.


The Redistributor (GICR) registers are programmed through the Distributor ACE-Lite slave port. The Distributor also contains the architectural LPI functionality.

This section contains the following subsections:

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