at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 178

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

20.5.6.1
Figure 20-4. CompactFlash Memory Mapping
20.5.6.2
6249D–ATARM–20-Dec-07
I/O Mode, Common Memory Mode, Attribute Memory Mode and True IDE Mode
CFCE1 and CFCE2 Signals
CF Address Space
Within the NCS4 and/or NCS5 address space, the current transfer address is used to distinguish
I/O mode, common memory mode, attribute memory mode and True IDE mode.
The different modes are accessed through a specific memory mapping as illustrated on
20-4. A[23:21] bits of the transfer address are used to select the desired mode as described in
Table 20-6 on page
Note:
Table 20-6.
To cover all types of access, the SMC must be alternatively set to drive 8-bit data bus or 16-bit
data bus. The odd byte access on the D[7:0] bus is only possible when the SMC is configured to
drive 8-bit memory devices on the corresponding NCS pin (NCS4 or NCS5). The Chip Select
Register (DBW field in the corresponding Chip Select Register) of the NCS4 and/or NCS5
address space must be set as shown in
NBS1 and NBS0 are the byte selection signals from SMC and are available when the SMC is set
in Byte Select mode on the corresponding Chip Select.
A[23:21]
000
010
100
110
111
The A22 pin is used to drive the REG signal of the CompactFlash Device (except in True IDE
mode).
CompactFlash Mode Selection
Offset 0x00E0 0000
Offset 0x00C0 0000
Offset 0x0080 0000
Offset 0x0040 0000
Offset 0x0000 0000
178.
Table 20-7
Common Memory Mode Space
True IDE Alternate Mode Space
Attribute Memory Mode Space
AT91SAM9263 Preliminary
True IDE Mode Space
Alternate True IDE Mode
I/O Mode Space
Mode Base Address
Common Memory
Attribute Memory
to enable the required access type.
True IDE Mode
I/O Mode
Figure
178