Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Hoja De Datos
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AT91SAM9N12-EK
309
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
27.
External Bus Interface (EBI)
27.1
Description
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.
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).
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.
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.
27.2
Embedded Characteristics
32-bit Wide Interface, Supporting:
16-bit DDR2/LPDDR, 32-bit SDRAM/LPSDR
Static Memories
NAND Flash with Multi-bit ECC