AT91SAM7A2-AI datasheet(19/369 Pages) ATMEL

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PRELIMINARY

AT91SAM7A2

6021A–ATARM–07/04

Memory Map

When the AT91SAM7A2 microcontroller is reset, the ARM core is in reboot mode to

access the external memory (usually ROM) on NCS0 at address 0x00000000. The

internal RAM is located at address 0x00300000.

When the software executes the remap command (write 1 in RCB field in AMC_RCR

external memory accessed on the NCS0 is located in the memory space from

0x40000000 to 0x7FFFFFFF, depending on the AMC_NCS0 register in the Advanced

Memory Controller, then the chip is in remap mode.

Reboot Mode

The memory map in reboot mode is described below.

Table 17. Memory Map in Reboot Mode

Memory Space

Application

Abort

0xFFFFFFFF

–

0xFFE00000

Peripheral devices

0xFFDFFFFF

–

0x00400000

Reserved

Yes

0x003FFFFF

–

0x00300000

Internal RAM 16 kbytes

repeated 64 times

0x002FFFFF

–

0x00200000

Reserved

(Read as '0')

0x001FFFFF

–

0x00100000

Reserved

Yes

0x000FFFFF

–

0x00000000

External memory on NCS0

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