Datasheet

131
SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
19. External Bus Interface (EBI)
19.1 Overview
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 SDRAM.
The EBI also supports the CompactFlash and the NAND Flash protocols via integrated circuitry that greatly
reduces the requirements for external components. Furthermore, the EBI handles data transfers with up to eight
external devices, each assigned to eight 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 26 bits, up to eight chip select
lines (NCS[7:0]) and several control pins that are generally multiplexed between the different external Memory
Controllers.