addition to the AXI and ACE interfaces, the CCI-550 provides interfaces that you can use for various system
- Programming the CCI-550 internal registers, debugging, and performance monitoring using an APB4
- Controlling clock and power states with P-Channel and Q-Channel to
minimize power at low bandwidth.
- Logic and RAM
includes snoop functionality that permits snooping of the ACE interfaces. A snoop filter
provides efficient snoop transaction management by keeping a record of the addresses stored in
the caches of the attached ACE masters. This means that the snoop filter can often resolve
coherency messaging instead of broadcasting to all ACE interfaces. This mechanism can offer
system power savings and reduce the latency in the case where data is not held in any of the
A Performance Monitoring Unit (PMU) provides
events and counters that indicate CCI-550 runtime performance. PMU registers provide information on the status of
the interconnect and you can use these registers to help debug system deadlock. In addition,
the CCI-550 provides a set of QoS
regulation and control mechanisms.
supports Secure and Non-secure operations that can be used within a system that uses ARM
TrustZone® to provide Secure, Non-secure, and protected states.
The CCI-550 also
supports cache maintenance operations and exclusive accesses.