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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
16-4
Freescale Semiconductor
The MMU regions are mapped with logical address the same as physical address except for the external
bus interface (EBI). The logical EBI address space is mapped to physical addresses of the internal flash
memory. This allows a code, written to run from external memory, to be executed from internal flash
Then the BAM program reads the status of the two BOOTCFG pins from the reset status register
(SIU_RSR) and the appropriate boot sequence is started as shown in the
Depending on the values stored in the censorship word and serial boot control word in the shadow row of
internal flash memory, the internal flash memory can be enabled or disabled, the Nexus port can be enabled
or disabled, the password received in serial boot mode is compared with a fixed public password or
compared to a user programmable password in the internal flash memory. The
summarizes all
these possibilities.
The censorship word is a 32-bit word of data stored in the shadow row of internal flash memory. This
memory location is read and interpreted by hardware as part of the boot process and is used in conjunction
with the BOOTCFG pins to enable/disable the internal flash memory and the Nexus interface. The
memory address of the censorship word is 0x00FF_FDE0. The censorship word consists of two fields:
3
Internal SRAM
0x4000_0000
0x4000_0000
256 Kbytes
Cache inhibited
Not guarded
Big Endian
Global PID
4
Peripheral Bridge A
0xC3F0_0000
0xC3F0_0000
1 MB
Cache inhibited
Not Guarded
1
Big Endian
Global PID
1
For future compatibility, configure peripheral bridge A as guarded.
Table 16-3. Boot Modes
BOOTCFG
[0:1]
Censorship
Control
0x00FF_FDE0
Serial Boot
Control
0x00FF_FDE2
Boot Mode Name
Internal
Flash
State
Nexus
State
Serial
Password
00
!0x55AA
Don't care
Internal—Censored
Enabled
Disabled
Flash
0x55AA
Internal—Public
Enabled
Enabled
Public
01
Don't care
0x55AA
Serial—Flash Password
Enabled
Disabled
Flash
!0x55AA
Serial—Public Password
Disabled
Enabled
Public
10
!0x55AA
Don't care
External—No Arbitration—Censored
Disabled
Enabled
Public
0x55AA
External—No Arbitration—Public
Enabled
Enabled
Public
11
!0x55AA
Don't care
External—External Arbitration
—Censored
Disabled
Enabled
Public
0x55AA
External—External Arbitration
—Public
Enabled
Enabled
Public
Note: ’!’ = ’NOT’, meaning any value other than the value specified. Values 0x0000 and 0xFFFF should not be used.
Table 16-2. MMU Configuration for Internal Flash Boot
TLB
Entry
Region
Logical Base
Address
Physical Base
Address
Size
Attributes
Содержание MPC5553
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