The Remote Debug Interface (RDI) is an Application Programming Interface (API) that defines a standard set of data structures and functions that abstract hardware for debugging purposes. *The Remote Debug Interface has for ten years served as a useful and widely adopted interface between debuggers and debug target (simulators, emulators and monitors) for the ARM architecture.
*[Source: ARM DevZone]

ARM
ARM is a provider of 16/32-bit embedded RISC microprocessor solutions. The company licenses its high-performance, low-cost, power-efficient RISC processors, peripherals, and system-on-chip designs to leading international electronics companies.