at91cap7e ATMEL Corporation, at91cap7e Datasheet - Page 123

• Manufacturer Part Number: at91cap7e
• Description: Customizable Microcontroller
• Manufacturer: ATMEL Corporation

20.6.5.1
20.6.5.2
8549A–CAP–10/08
I/O Mode, Common Memory Mode, Attribute Memory Mode and True IDE Mode
CFCE1 and CFCE2 signals
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
20-3. A[23:21] bits of the transfer address are used to select the desired mode as described in
Table 20-5 on page
Figure 20-3. CompactFlash Memory Mapping
Note:
Table 20-5.
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 and or NCS5). The Chip
Select Register (DBW field in the corresponding Chip Select Mode 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 of the EBI is used to drive the REG signal of the CompactFlash Device (except in
True IDE mode).
CF Address Space
CompactFlash Mode Selection
123.
Offset 0x00E0 0000
Offset 0x00C0 0000
Offset 0x0080 0000
Offset 0x0040 0000
Offset 0x0000 0000
Table 20-6
Alternate True IDE Mode
Mode Base Address
Common Memory
Attribute Memory
True IDE Mode
Common Memory Mode Space
True IDE Alternate Mode Space
Attribute Memory Mode Space
I/O Mode
to enable the required access type.
True IDE Mode Space
I/O Mode Space
AT91CAP7E
Figure
123