3.1 About this programmers model
This section provides general information about the CCI-550 register properties.
The following information applies to the CCI-550 registers:
- The base address is not fixed, and can be different for any particular
system implementation. The offset of each register from the base address is fixed.
- Do not attempt to access reserved or unused address locations. Attempting
to access these locations can result in UNPREDICTABLE behavior.
Unless otherwise stated in the accompanying text:
Access type is described as follows:
|RW||Read and write.
|RAZ||Read as zero.
Bit positions described as reserved are:
registers are accessed using the APB4 slave interface and cannot be accessed directly
through the ACE or ACE-Lite slave interfaces.
The programmers model contains regions for control, slave interface, and
performance counter registers. Accesses to unmapped or reserved registers are WI/RAZ.
Non-secure accesses to Secure registers are WI/RAZ.
The programmers model is not affected by the number of interfaces on a
specific CCI-550 configuration.
Writing to registers pertaining to interfaces that are not present on your specific
implementation has no effect.