Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK Data Sheet
Product codes
AT91SAM9G25-EK
336
SAM9G25 [DATASHEET]
11032D–ATARM–10-Mar-2014
26.5.3.4 Power supplies
The product embeds a dual power supply for EBI: VDDNF for NAND Flash signals and VDDIOM for others. This makes
it possible to use a 1.8V or 3.3V NAND Flash independently of the SDRAM power supply.
it possible to use a 1.8V or 3.3V NAND Flash independently of the SDRAM power supply.
The switch NFD0_ON_D16 is used to select the NAND Flash path on D0–D15 or D16–D31 depending on memory power
supplies. This switch is located in the CCFG_EBICSA register in the Bus Matrix.
supplies. This switch is located in the CCFG_EBICSA register in the Bus Matrix.
illustrates an example of the NAND Flash and the external RAM (DDR2 or LP-DDR or 16-bit LP-SDR) in the
same power supply range (NFD0_ON_D16 = default).
Figure 26-2. NAND Flash and External RAM in Same Power Supply Range (NFD0_ON_D16 = default)
illustrates an example of the NAND Flash and the external RAM (DDR2 or LP-DDR or 16-bit LP-SDR) not in
the same power supply range (NFD0_ON_D16 = 1).
This can be used if the SMC connects to the NAND Flash only. Using this function with another device on the SMC will
lead to an unpredictable behavior of that device. In that case, the default value must be selected.
lead to an unpredictable behavior of that device. In that case, the default value must be selected.
D[15:0]
ALE
A[22:21]
CLE
D[15:0]
EBI
NAND Flash (1.8V)
DDR2 or
LP-DDR or
16-bit LP-SDR (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]