MAC7200 datasheet(199/976 Pages) FREESCALE

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Memory Map Relocation

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

121

9.16.3.4

SRAM

The SRAM is always software relocatable (via the AAMR register in the MCM) to the following

addresses:

•

$0000 0000

•

$2000 0000

•

$4000 0000

9.16.4

Programming the AAMR register in the MCM

Because the programming of this register is initially slightly counter-intuitive, a short explanation of how

it works is presented.

Each 512Mbyte address range in the MAC72xx’s 4GByte addressable space has a corresponding nibble

(called a “slot” hereafter). When an transfer is seen on a Master Port of the AXBS (crossbar switch), the

upper three address bits are used to determine which AAMR slot will be used to determine the correct

Slave Port to route to. The slots in the AAMR are allocated as follows:

The upper bit of each nibble/slot is the valid bit, 1=valid, 0=invalid. In the case of an invalid address, the

transfer is aborted. The lower 3 bits of each nibble/slot determine the Slave Port number that the transfer

will be routed to. The MAC72xx has the following valid Slave Ports:

NOTE

Bits [31:8] of the AAMR are always fixed at value $f0d00b. If any nibble is

written with an illegal value, then none of the register nibbles will be

updated.

In Normal/Secured Bootloader Mode, when the Shadow Block is located at $0000 0000, the reset value of

the AAMR register will be $88.

Base Address

$E000 0000

$C000 0000

$A000 0000

$8000 0000

AAMR Bits

31:28

27:24

23:20

19:16

Base Address

$6000 0000

$4000 0000

$2000 0000

$0000 0000

AAMR Bits

15:12

11:8

7:4

3:0

Table 9-20. AXBS Slave Port Definitions

Slave Port Resource (AAMR Value)

FLASH ($8)

FlexBus ($9)

SRAM ($b)

BAM ($d)

Peripheral Bus ($f)

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