Event triggered memory mapped access

In one or more embodiments, a data processing system can include at least one core capable of executing instructions of an instruction set architecture and a triggered memory map access (tMMA) system coupled to the at least one core. The tMMA system can receive one or more events and, in response, perform one or more actions. For example, the actions can include transactions which can include a write to a an address of the memory map, a read from an address of the memory map, a read followed by write to two respective addresses of the memory map, and/or a fetch transaction. A result of a transaction (e.g., data read, data written, error, etc.) can be used in generating a trace message. For example, the tMMA system can generate a trace message that includes the result of the transaction and send the trace message to a trace message bus.