3.2.1 Description

The External Bus Interface (EBI) is designed to ensure successful data transfers between external devices and the embedded memory controller of the SAM9X7 Series device.

The Static Memory, MPDDR and ECC 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 DDR3(L)/DDR2 SDRAM.

The EBI also supports the NAND Flash protocols via an integrated circuitry that greatly reduces the requirements for external components. Furthermore, the EBI handles data transfers with up to three external devices, each assigned to three address spaces defined by the embedded memory controller. Data transfers are performed through a 16-bit data bus, an address bus of up to 23 bits, up to three chip select lines (NCS[2:0]) and several control pins that are generally multiplexed between the different external memory controllers.