crc

Contains the expected CRC of the region in the On-chip RAM.The Boot ROM code calculates the actual CRC for all bytes in the region specified by the DATA START an LENGTH registers. The contents of the EXECUTION register (after it has been read and modified by the Boot ROM code) is also included in the CRC calculation. The contents of the EXECUTION register is added to the CRC accumulator a byte at a time starting with the least significant byte. If the actual CRC doesn't match the expected CRC value in this register, the Boot ROM won't boot from the On-chip RAM. The CRC is a standard CRC32 with the polynomial: x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x + 1 There is no reflection of the bits and the initial value of the remainder is 0xFFFFFFFF and the final value is exclusive ORed with 0xFFFFFFFF.