MAC7200 datasheet(187/976 Pages) FREESCALE

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Secured Single Chip Mode

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

109

After Reset, the memory map may be re-mapped using the AAMR register in the MCM module. The

allowed combinations are shown in Table 9-6. The Peripheral Bus space is always fixed at $FC00 0000,

and is not re-mappable.

9.5

Secured Single Chip Mode

Secured Single Chip Mode is typically used to execute application code in the final application, where a

software bootloader is not required. Booting is done from the Flash Main Array, with limited device

functionality. In this mode, the following functionality is available:

•

Debug functionality (EICE, Nexus and the JTAG interface) is disabled

— SC4 chain is still enabled

•

External Bus Interface is disabled

•

Flash main array access is enabled

•

Shadow Block access is enabled

•

Boot from the Flash main array

Table 9-7 shows the device memory map of the device in Secured Single Chip Mode after Reset. The

memory map for this mode differs from the memory map in Normal Single Chip Mode as follows:

•

The External Bus Interface is not available

2. The SRAM is mirrored across the entire 512MByte address range on a 32K boundary. Therefore, the first

word in SRAM may be read from or written to using address $4000 0000 or address $4000 8000 or address

$4001 0000, etc.

Table 9-6. Allowed Memory Maps in Normal Expanded Mode

$0000 0000

$2000 0000

$4000 0000

AAMR Register

External Bus

Flash Main Array

SRAM

$f0d0 0b89

Unused

Flash Main Array

SRAM

$f0d0 0b80

SRAM

Flash Main Array

SRAM

$f0d0 0b8b

Flash Main Array

External Bus

SRAM

$f0d0 0b98

External Bus

SRAM

$f0d0 0b99

Unused

External Bus

SRAM

$f0d0 0b90

SRAM

External Bus

SRAM

$f0d0 0b9b

Flash Main Array

Unused

SRAM

$f0d0 0b08

External Bus

Unused

SRAM

$f0d0 0b09

Unused

SRAM

$f0d0 0b00

SRAM

Unused

SRAM

$f0d0 0b0b

Flash Main Array

SRAM

$f0d0 0bb8

External Bus

SRAM

$f0d0 0bb9

Unused

SRAM

$f0d0 0bb0

SRAM

$f0d0 0bbb

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