Datasheet

SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
142
Figure 19-5. CompactFlash Application Example
19.6.6 NAND Flash Support
The EBI integrates circuitry that interfaces to NAND Flash devices.
The NAND Flash logic is driven by the Static Memory Controller on the NCS3 address space. Programming the
EBI_CS3A bit in the EBI Chip Select Assignment Register to the appropriate value enables the NAND Flash logic.
Access to an external NAND Flash device is then made by accessing the address space reserved to NCS3 (i.e.,
between 0x40000000 and 0x4FFF FFFF).
The NAND Flash Logic drives the read and write command signals of the SMC on the NANDOE and NANDWE
signals when the NCS3 signal is active. NANDOE and NANDWE are invalidated as soon as the transfer address
fails to lie in the NCS3 address space. For details on these waveforms, refer to Section 20. “Static Memory
Controller (SMC)”.
The NANDOE and NANDWE signals are multiplexed with NCS6 and NCS7 signals of the Static Memory
Controller. This multiplexing is controlled in the MUX logic part of the EBI by the EBI_CS3A bit in the EBI Chip
Select Assignment Register. NCS6 and NCS7 become unavailable. Performing an access within the address
space reserved to NCS6 and NCS7 (i.e., between 0x70000000 and 0x8FFF FFFF) may lead to an unpredictable
outcome.
CompactFlash ConnectorEBI
D[15:0]
/OEDIR
_CD1
_CD2
/OE
D[15:0]
A25/CFRNW
NCS4/CFCS0
CD (PIO)
A[10:0]
A22/REG
NRD/CFOE
A[10:0]
_REG
_OE
_WE
_IORD
_IOWR
_CE1
_CE2
NWE/CFWE
NWR1/CFIOR
NWR3/CFIOW
CFCE1
CFCE2
_WAIT
NWAIT