Arm
®
CoreLink™ GIC-600AE Generic Interrupt Controller
Technical Reference Manual
Document ID: 101206_0003_04_en
Issue: 04
Components and configuration
3.2 Redistributor
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 3-2: GIC-600AE Redistributor
ppi<n>_r
Cluster of
cores
Cluster of
cores
Cluster of
cores
Q-Channel
GIC Stream protocol interfaces
icdp* ,
AXI-Stream
interface
icpd* ,
AXI-Stream
interface
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. See Configuration options in the Arm
®
CoreLink
™
GIC-600AE Generic Interrupt Controller
Configuration and Integration Manual for more information.
The Redistributor (GICR) registers are programmed through the Distributor ACE-Lite
subordinate port. The Distributor also contains the architectural LPI functionality.
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