Boot Assist Module (BAM)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
15-5
summarizes the different boot modes.
The 32-bit censorship word, which contains the censorship control and serial boot control fields, is read
and interpreted during the boot process. Its value is used in conjunction with the BOOTCFG[0:1] values
to enable or disable the internal flash memory and the Nexus interface. The censorship word is
programmed at the factory to contain 0x55AA_55AA, which uses a password in internal flash to activate
serial boot mode for an uncensored (public) device.
The censorship word starts at address 0x00FF_FDE0 and contains a 16-bit censorship control field [0:15]
and a 16-bit serial boot control field [16:31]. The factory default settings are shown in
:
Table 15-3. 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
1
1
‘!’ = ‘NOT,’ as in !0x55AA, which means all values except 0x55AA. Do not use 0x0000 or 0xFFFF for the value of the
censorship control or serial boot control words.
Any value
Internal—Censored
Enabled
Disabled
Flash
0x55AA
Internal—Public
Enabled
Enabled
Public
01
Any value
0x55AA
Serial—Flash password
Enabled
Disabled
Flash
!0x55AA
Serial—Public password
Disabled
Enabled
Public
10
!0x55AA
Any value
External—No arbitration—Censored
Disabled
Enabled
Public
0x55AA
External—No arbitration—Public
Enabled
Enabled
Public
11
Invalid value
Address: 0x00FF_FDE0
Value: 0x55AA
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Binary value
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
Hex value
5
5
A
A
Censorship control field–default value configures the device as uncensored.
Address: 0x00FF_FDE2
Value: 0x55AA
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Binary value
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
Hex value
5
5
A
A
Serial boot control field–default value reads a password from internal flash.
Figure 15-2. Censorship Word
Содержание MPC5565
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Страница 559: ...SRAM MPC5565 Microcontroller Reference Manual Rev 1 0 14 6 Freescale Semiconductor...
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Страница 895: ...Deserial Serial Peripheral Interface DSPI MPC5565 Microcontroller Reference Manual Rev 1 0 19 72 Freescale Semiconductor...
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