Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet
Product codes
AT91SAM9N12-EK
316
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
27.7.4 Power
Supplies
The product embeds a dual power supply for EBI. VDDNF for NAND Flash signals and VDDIOM for others. This allows
to use an 1.8V or 3.3V NAND Flash independently of SDRAM power supply.
to use an 1.8V or 3.3V NAND Flash independently of SDRAM power supply.
A switch, NFD0_ON_D16, enables the user to select NAND Flash path on D0-D15 or D16-D32 depending on memory
power supplies. This switch is located in the register EBICSA in the Bus Matrix user interface.
power supplies. This switch is located in the register EBICSA in the Bus Matrix user interface.
In the following example the NAND Flash and the external RAM (DDR2 or LPDDR or 16-bit LPSDR) are in the same
power supply range, (NFD0_ON_D16 = 0).
power supply range, (NFD0_ON_D16 = 0).
Figure 27-3. NAND Flash and the external RAM power supply (NFD0_ON_D16 = 0)
D[15:0]
ALE
A[22:21]
CLE
D[15:0]
EBI
NAND Flash (1.8V)
DDR2 or
LPDDR or
16-bit LPSDR (1.8V)
D[15:0]
D[15:0]
ALE
A[22:21]
CLE
D[15:0]
EBI
NAND Flash (3.3V)
32bit SDRAM (3.3V)
D[15:0]
D[31:16]
D[31:16]