16.11.3 32-bit Cyclic Redundancy Check (CRC32)
The DSU unit provides support for calculating a Cyclic Redundancy Check (CRC32) value for a memory area (including Flash and AHB RAM).
When the CRC32 command is issued from:
- The internal range, the CRC32 can be operated at any memory location
- The external range, the CRC32 operation is restricted; DATA, ADDR, and LENGTH values are forced (see the following table)
| AMOD[1:0] | Short Name | External Range Restrictions |
|---|---|---|
| 0 | ARRAY | CRC32 is restricted to the full Flash array area. DATA forced to 0xFFFFFFFF before calculation (no seed). |
| 1-3 | Reserved | — |
The algorithm employed is the industry standard CRC32 algorithm using the generator polynomial 0xEDB88320 (reversed representation).