The External Bus Interface (EBI) is designed to ensure the successful data transfer between several external devices and the embedded Memory Controller of an ARM-based device.
The Static Memory and SDRAM Controllers are all featured external Memory Controllers on the EBI. These external Memory Controllers are capable of handling several types of external memory and peripheral devices, such as SRAM, PROM, EPROM, EEPROM, Flash, and SDR-SDRAM. The EBI operates with a 1.8V or 3.3V power supply.
The EBI also supports the NAND Flash protocols through integrated circuitry that reduces the requirements for external components. Additionally, the EBI handles data transfers with up to six external devices, each assigned to six address spaces defined by the embedded Memory Controller. Data transfers are performed through a 16-bit or 32-bit data bus, an address bus of up to 24 bits, up to four chip select lines (NCS[3:0]) and several control pins that are generally multiplexed between the different external Memory Controllers.