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ROM
7.5.7
CI_CRC
CodeWarrior has the ability to calculate a CRC over a range of code and include it as part of the flash or
ROM image. This function replicates the same algorithm, which can be used to confirm code integrity over
time.
The CRC function will fail with a security violation if the device has security enabled.
7.5.7.1
CI_CRC Checksum command-packet format
The 5-bit command code for the CRC command is 0x04. The command packet requires 8 mailboxes and
Table 7-23. Command packet format (RANGE=1, CS=1) at mailbox level
Mailbox #
0
Description
Command byte
Bit 7
0
Bit 6
0
Bit 5
1
Bit 4
0
Bit 3
0
Bit 2
0
Bit 1
0
Bit 0
0
1
2
3
4
5
6
7
8 - 31
Parameter byte
CRC Seed [15:8]
CRC seed [7:0]
Starting offset [15:8]
Starting offset [7:0]
Ending offset [15:8]
Ending offset [7:0]
NOT USED
MEM
SEED[15:8]
SEED[7:0]
OFFL[15:8]
OFFL[7:0]
OFFH[15:8]
OFFH[7:0]
NOT USED
RESERVED
Table 7-24. CI_CRC command field descriptions
Field
MEM
RESERVED
SEED[15:0]
OFFL[15:0]
94
Description
Memory Space
All values other than the following are reserved.
000 Flash memory
001 ROM
010 RAM
Reserved Bit Field
Write as 0x00
CRC Seed Value
CRC calculations start with a known seed value. The recommended seed is 0x1D0F, although any value may
be used.
Low Address Offset
The base address of the memory + OFFL represents the first location in memory that will be accessed for the
CRC calculation.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
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