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NXP Semiconductors
• CRC value is read MSB first on the APB interface
Note: The same equations are used for LSB first and for MSB first. A simple serial shift is
performed on the input data, preset value and calculated CRC to output the correct CRC
value.
9.4 Typical Usage Example
For an input buffer size of 7 bytes and required output of 32-bit CRC with LSB first input,
the CRC_CONTROL_REG is configured with 0x00000015. The first 4 bytes of the buffer
is written to CRC_DAT32, the next 2 bytes is written to CRC_DAT16 and the last byte is
written to CRC_DAT8. The CRCDAT_CALC is returned that contains the computed CRC
Alternatively, after writing 4 bytes of buffer to CRC_DAT32 and the next 3 bytes can be
recursively written to CRC_DAT8 also.
CRC-16 set-up
Polynomial = x
Seed Value = 0xFFFF
Bit order reverse for data input: YES
1's complement for data input: NO
Bit order reverse for CRC sum: YES
1's complement for CRC sum: NO
CRC_MODE = 0x0000 0015
CRC_SEED = 0x0000 0000
CRC-32 set-up
Polynomial = x
Seed Value = 0xFFFF FFFF
Bit order reverse for data input: YES
1's complement for data input: NO
Bit order reverse for CRC sum: YES
1's complement for CRC sum: YES
CRC_CONTROL_REG = 0x0000 0015
CRC_SEED = 0xFFFF FFFF
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All information provided in this document is subject to legal disclaimers.
Rev. 1.4 — 14 May 2018
314514
PN7462 family HW user manual
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