Atmel Evaluation Kit AT91SAM9G25-EK AT91SAM9G25-EK 데이터 시트
제품 코드
AT91SAM9G25-EK
311
SAM9G25 [DATASHEET]
11032C–ATARM–25-Jan-13
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 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 LP-DDR or 16-bit LP-SDR) are in the same
power supply range, (NFD0_ON_D16 = default).
power supply range, (NFD0_ON_D16 = default).
In the following example the NAND Flash and the external RAM (DDR2 or LP-DDR or 16bit LP-SDR) are NOT in the
same power supply range (NFD0_ON_D16 = 1).
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.
At reset, NFD0_ON_D16 = 0 and the NAND Flash bus is connected to D0-D15.
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]
D[15:0]
ALE
A[22:21]
CLE
D[15:0]
EBI
NAND Flash (3.3V)
DDR2 or
LP-DDR or
16-bit LP-SDR (1.8V)
D[15:0]
D[31:16]