The AXI External Bus Interface (EBI) allows the processor to transmit and receive data to an external device, usually a memory (SRAM, Flash, etc.). The number of read wait states, the number of write wait states, and the memory width are all configurable through the APB register interface of the EBI. The EBI allows word, half-word, and byte width addressing to 64-bit, 32-bit, 16-bit, and 8-bit external devices.