Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet

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SAM9G25 [DATASHEET]

11032D–ATARM–10-Mar-2014

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, DDR, SDRAM 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, DDR2 and SDRAM. The EBI operates with 1.8V or 3.3V Power Supply 
(VDDIOM).

The EBI also supports the NAND Flash protocols via integrated circuitry that greatly reduces the requirements for 
external components. Furthermore, 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 26 bits, up to six chip select lines (NCS[5:0]) and several control pins that are generally 
multiplexed between the different external Memory Controllers.

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Integrates three External Memory Controllers:

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Static Memory Controller

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DDR2/SDRAM Controller

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8-bit NAND Flash ECC Controller

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Up to 26-bit Address Bus (up to 64 Mbytes linear per chip select)

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Up to 6 chip selects, Configurable Assignment:

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Static Memory Controller on NCS0, NCS1, NCS2, NCS3, NCS4, NCS5

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DDR2/SDRAM Controller (SDCS) or Static Memory Controller on NCS1

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NAND Flash support on NCS3