About the signal descriptions
The tables in this appendix list the Cortex-A73 processor signals, along with their direction, input or output, and a high-level description.
Some of the buses include a configurable width field, <Signal>[CN:0], where CN = 0, 1, 2, or 3, to encode up to four cores. For example:
- nIRQ represents a core 0 interrupt request.
- nIRQ represents a core 2 interrupt request.
Some signals are specified in the form <signal>x where x = 0, 1, 2 or 3 to reference core 0, core 1, core 2, core 3. If a core is not present, the corresponding pin is removed. For example:
- PMUEVENT0[24:0] represents the core 0 PMU event bus.
- PMUEVENT3[24:0] represents the core 3 PMU event bus.
The number of signals changes depending on the configuration. For example, the ACP interface signals are not present if the ACP interface is not implemented.