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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
15-8
Freescale Semiconductor
Table 15-4. Changes to MPC5553/5554RM for Rev. 5.0 Release
Section 15.7, “Initialization/Application Information
from:
In order to use the SRAM, it is essential for the ECC check bits to be initialized after power on. A 64-bit cache inhibited write
to each location in SRAM should be used to initialize the SRAM array as part of the application initialization code. The write
transfer must be 64 bits in size, otherwise the write transfer will generate a read / modify / write operation which will check the
ECC value upon the read. See Section 15.4.1, ìSRAM ECC Mechanism.î
NOTE
The SRAM must be initialized, even if the application does not use ECC
reporting.
To:
To use the SRAM, the ECC must check all bits that require initialization after power on. You must use a 64-bit cache-inhibited
write to each SRAM location in the application initialization code to initialize the SRAM array. If the write is not the entire 64-bits
wide
(8-, 16-, or 32-bits), a read / modify / write operation is generated that checks the ECC value upon the read. Refer to
Section 15.6, “SRAM ECC Mechanism
.”
NOTE
The SRAM must be initialized, even if the application does not use ECC reporting.
Description of Change
No change for Rev. 5 release.
Table 15-3. Changes to MPC5553/5554RM for Rev. 4.0 Release (Continued)
Содержание MPC5553
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