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AN4253 bảng dữ liệu(PDF) 8 Page - STMicroelectronics

tên linh kiện AN4253
Giải thích chi tiết về linh kiện  SPC564Lx device startup flow
PDF  44 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN4253 bảng dữ liệu(HTML) 8 Page - STMicroelectronics

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After reset init
AN4253
8/44
DocID024255 Rev 2
2
After reset init
Figure 2. Flow of the "After reset init" phase
2.1
Core Register Init (LSM)
In Lock Step (LSM) Mode it is mandatory to initialize the core specific purpose register to
avoid redundant checker faults under specific circumstances. The reason for the faults
comes from the fact that not all core specific purpose registers are initialized after reset and
their difference can cause RCCU fault later on.
It is not necessary to initialize the core SPRs registers when the device is operating in
decoupled mode.
2.1.1
Code sequence
1.
Write to selected Core Specific Purpose Registers (SPRs) any
value
2.2
Memory Management Unit (MMU)
Default reset MMU configuration in each core enables instruction fetch from 4 KB memory
block area starting from a reset vector address. 4 KB code area may or may not be sufficient
for the startup code, but a main issue of the default MMU configuration is missing access
setup for RAM memory and for peripheral modules. They must be explicitly added to the
MMU table before any access is executed to them by the startup code.



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